CVE-2026-72463
xfrm: Fix dev use-after-free in xfrm async resumption
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix dev use-after-free in xfrm async resumption xfrm async resumption hold skb->dev refcnt until after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below: unregister_netdevice: waiting for vti1 to become free. Usage count = -2 Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection over xfrm_rcv_cb and transport_finish to prevent races.
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 17, 2026, 6:19 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply kernel updates to resolve the issue.
- Ensure RCU protection is extended.
- Stash original skb->dev for refcnt balance.
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-2026-72463.
| URL | Resource |
|---|---|
| https://git.kernel.org/stable/c/63a30015199912bd5055bead8001b1ae68a67cdb | |
| https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72463 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-2026-72463
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-2026-72463 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72463 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1c428b03840094410c5fb6a5db30640486bbbfcb', 'lessThan': '63a30015199912bd5055bead8001b1ae68a67cdb', 'versionType': 'git'}, {'status': 'affected', 'version': '1c428b03840094410c5fb6a5db30640486bbbfcb', 'lessThan': '8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff', 'versionType': 'git'}, {'status': 'affected', 'version': '4236c30b437b80f673b9e08c8fae38b8d471ac9e', 'versionType': 'git'}, {'status': 'affected', 'version': '0f451b43c88bf2b9c038b414be580efee42e031b', 'versionType': 'git'}, {'status': 'affected', 'version': '5002beda5cac69d522dc54da0d5d463ed9c963d2', 'versionType': 'git'}, {'status': 'affected', 'version': '6.12.94', 'lessThan': '6.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.23', 'lessThan': '6.19', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.13', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['net/ipv4/xfrm4_input.c', 'net/ipv6/xfrm6_input.c', 'net/xfrm/xfrm_input.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv4/xfrm4_input.c', 'net/ipv6/xfrm6_input.c', 'net/xfrm/xfrm_input.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1c428b03840094410c5fb6a5db30640486bbbfcb', 'lessThan': '63a30015199912bd5055bead8001b1ae68a67cdb', 'versionType': 'git'}, {'status': 'affected', 'version': '1c428b03840094410c5fb6a5db30640486bbbfcb', 'lessThan': '8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff', 'versionType': 'git'}, {'status': 'affected', 'version': '4236c30b437b80f673b9e08c8fae38b8d471ac9e', 'versionType': 'git'}, {'status': 'affected', 'version': '0f451b43c88bf2b9c038b414be580efee42e031b', 'versionType': 'git'}, {'status': 'affected', 'version': '5002beda5cac69d522dc54da0d5d463ed9c963d2', 'versionType': 'git'}, {'status': 'affected', 'version': '6.12.94', 'lessThan': '6.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.23', 'lessThan': '6.19', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.13', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['net/ipv4/xfrm4_input.c', 'net/ipv6/xfrm6_input.c', 'net/xfrm/xfrm_input.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv4/xfrm4_input.c', 'net/ipv6/xfrm6_input.c', 'net/xfrm/xfrm_input.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 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': '1c428b03840094410c5fb6a5db30640486bbbfcb', 'lessThan': '63a30015199912bd5055bead8001b1ae68a67cdb', 'versionType': 'git'}, {'status': 'affected', 'version': '1c428b03840094410c5fb6a5db30640486bbbfcb', 'lessThan': '8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff', 'versionType': 'git'}, {'status': 'affected', 'version': '4236c30b437b80f673b9e08c8fae38b8d471ac9e', 'versionType': 'git'}, {'status': 'affected', 'version': '0f451b43c88bf2b9c038b414be580efee42e031b', 'versionType': 'git'}, {'status': 'affected', 'version': '5002beda5cac69d522dc54da0d5d463ed9c963d2', 'versionType': 'git'}, {'status': 'affected', 'version': '6.12.94', 'lessThan': '6.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.23', 'lessThan': '6.19', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.13', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['net/ipv4/xfrm4_input.c', 'net/ipv6/xfrm6_input.c', 'net/xfrm/xfrm_input.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv4/xfrm4_input.c', 'net/ipv6/xfrm6_input.c', 'net/xfrm/xfrm_input.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix dev use-after-free in xfrm async resumption xfrm async resumption hold skb->dev refcnt until after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below: unregister_netdevice: waiting for vti1 to become free. Usage count = -2 Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection over xfrm_rcv_cb and transport_finish to prevent races. Added Reference https://git.kernel.org/stable/c/63a30015199912bd5055bead8001b1ae68a67cdb Added Reference https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff