8.8
HIGH
CVSS 3.1
CVE-2026-64206
Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock
Overview
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock l2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for pending_rx_work. process_pending_rx() takes the same mutex, so teardown can deadlock against the worker it is flushing. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the l2cap_conn_ready() -> queue_work(..., &conn->pending_rx_work) submit path, the l2cap_conn_del() -> cancel_work_sync(&conn->pending_rx_work) teardown path, and the process_pending_rx() -> mutex_lock(&conn->lock) worker edge. Lockdep WARNING: possible circular locking dependency detected process_pending_rx+0x21/0x2a [vuln_msv] l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv] *** DEADLOCK *** Cancel pending_rx_work before taking conn->lock, matching the existing lock-before-drain ordering used for the two delayed works in the same teardown path. The pending_rx queue is still purged after the work has been cancelled and conn->lock has been acquired.
Details
INFO
Published Date :
July 20, 2026, 5:18 p.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Resolve potential deadlock by cancelling work before acquiring lock.
- Cancel pending_rx_work before acquiring conn->lock.
- Ensure pending_rx queue is purged after work cancellation.
- Match existing lock-before-drain ordering for delayed works.
- Apply the resolved code changes.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64206.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64206 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64206
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64206 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64206 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '9901f847a762a5d953871dd95767ce2aed3d684d', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '4a0bb0fd63fe2b0c62e1072cd1811d6f61e0081c', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '8daaf7f73fe998631a160d1a5a7e1b0b0480eef8', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '8de7b386ffad480ca59222b688c94a2da8f0d805', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'd5616beb3355b5fca2280d796c1cf7ada4ee6551', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'e96fbac8d3a73b0bc165383c092a30628561d320', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '2641a9e0a1dd4af2e21995470a21d55dd35e5203', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee805f9499ebd0edf0877990968543c752043b59', 'versionType': 'git'}, {'status': 'affected', 'version': '3.15.5', 'lessThan': '3.16', 'versionType': 'semver'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '9901f847a762a5d953871dd95767ce2aed3d684d', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '4a0bb0fd63fe2b0c62e1072cd1811d6f61e0081c', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '8daaf7f73fe998631a160d1a5a7e1b0b0480eef8', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '8de7b386ffad480ca59222b688c94a2da8f0d805', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'd5616beb3355b5fca2280d796c1cf7ada4ee6551', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'e96fbac8d3a73b0bc165383c092a30628561d320', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '2641a9e0a1dd4af2e21995470a21d55dd35e5203', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee805f9499ebd0edf0877990968543c752043b59', 'versionType': 'git'}, {'status': 'affected', 'version': '3.15.5', 'lessThan': '3.16', 'versionType': 'semver'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Aug. 11, 2026
Action Type Old Value New Value Added CWE NVD-CWE-Other Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:3.16:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:3.16:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:3.16:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:3.16:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:3.16:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.15.5 up to (excluding) 3.16 *cpe:2.3:o:linux:linux_kernel:3.16:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.212 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.178 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.145 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.97 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.16.1 up to (excluding) 5.10.261 Added Reference Type kernel.org: https://git.kernel.org/stable/c/2641a9e0a1dd4af2e21995470a21d55dd35e5203 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4a0bb0fd63fe2b0c62e1072cd1811d6f61e0081c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8daaf7f73fe998631a160d1a5a7e1b0b0480eef8 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8de7b386ffad480ca59222b688c94a2da8f0d805 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9901f847a762a5d953871dd95767ce2aed3d684d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d5616beb3355b5fca2280d796c1cf7ada4ee6551 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e96fbac8d3a73b0bc165383c092a30628561d320 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 24, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/4a0bb0fd63fe2b0c62e1072cd1811d6f61e0081c Added Reference https://git.kernel.org/stable/c/8daaf7f73fe998631a160d1a5a7e1b0b0480eef8 Added Reference https://git.kernel.org/stable/c/8de7b386ffad480ca59222b688c94a2da8f0d805 Added Reference https://git.kernel.org/stable/c/9901f847a762a5d953871dd95767ce2aed3d684d Added Reference https://git.kernel.org/stable/c/fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'd5616beb3355b5fca2280d796c1cf7ada4ee6551', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'e96fbac8d3a73b0bc165383c092a30628561d320', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '2641a9e0a1dd4af2e21995470a21d55dd35e5203', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee805f9499ebd0edf0877990968543c752043b59', 'versionType': 'git'}, {'status': 'affected', 'version': '3.15.5', 'lessThan': '3.16', 'versionType': 'semver'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '9901f847a762a5d953871dd95767ce2aed3d684d', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '4a0bb0fd63fe2b0c62e1072cd1811d6f61e0081c', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '8daaf7f73fe998631a160d1a5a7e1b0b0480eef8', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '8de7b386ffad480ca59222b688c94a2da8f0d805', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'd5616beb3355b5fca2280d796c1cf7ada4ee6551', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'e96fbac8d3a73b0bc165383c092a30628561d320', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '2641a9e0a1dd4af2e21995470a21d55dd35e5203', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee805f9499ebd0edf0877990968543c752043b59', 'versionType': 'git'}, {'status': 'affected', 'version': '3.15.5', 'lessThan': '3.16', 'versionType': 'semver'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'd5616beb3355b5fca2280d796c1cf7ada4ee6551', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': 'e96fbac8d3a73b0bc165383c092a30628561d320', 'versionType': 'git'}, {'status': 'affected', 'version': '7ab56c3a6eccb215034b0cb096e0313441cbf2a4', 'lessThan': '2641a9e0a1dd4af2e21995470a21d55dd35e5203', 'versionType': 'git'}, {'status': 'affected', 'version': 'ee805f9499ebd0edf0877990968543c752043b59', 'versionType': 'git'}, {'status': 'affected', 'version': '3.15.5', 'lessThan': '3.16', 'versionType': 'semver'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/l2cap_core.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock l2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for pending_rx_work. process_pending_rx() takes the same mutex, so teardown can deadlock against the worker it is flushing. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the l2cap_conn_ready() -> queue_work(..., &conn->pending_rx_work) submit path, the l2cap_conn_del() -> cancel_work_sync(&conn->pending_rx_work) teardown path, and the process_pending_rx() -> mutex_lock(&conn->lock) worker edge. Lockdep WARNING: possible circular locking dependency detected process_pending_rx+0x21/0x2a [vuln_msv] l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv] *** DEADLOCK *** Cancel pending_rx_work before taking conn->lock, matching the existing lock-before-drain ordering used for the two delayed works in the same teardown path. The pending_rx queue is still purged after the work has been cancelled and conn->lock has been acquired. Added Reference https://git.kernel.org/stable/c/2641a9e0a1dd4af2e21995470a21d55dd35e5203 Added Reference https://git.kernel.org/stable/c/d5616beb3355b5fca2280d796c1cf7ada4ee6551 Added Reference https://git.kernel.org/stable/c/e96fbac8d3a73b0bc165383c092a30628561d320
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.