CVE-2026-72117
can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()
Description
In the Linux kernel, the following vulnerability has been resolved: can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler() For an rx op subscribed on all interfaces (ifindex == 0), the same op is registered once in the shared per-netns wildcard filter list, so bcm_rx_handler() can run concurrently on different CPUs for frames arriving on different net devices. op->rx_stamp and op->rx_ifindex were written before bcm_rx_update_lock was taken, allowing concurrent writers to race each other - including a torn store of the 64-bit rx_stamp on 32-bit platforms. Beyond a torn store bcm_send_to_user() must report the timestamp/ifindex of the very same frame whose content it is delivering. So the assignment is placed in the same unbroken bcm_rx_update_lock section as the content comparison. As a side effect, the RTR-request frame feature (which never reach bcm_send_to_user()) no longer updates rx_stamp/rx_ifindex, since only the notification path needs them.
INFO
Published Date :
Aug. 15, 2026, 6:21 a.m.
Last Modified :
Aug. 17, 2026, 6:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the Linux kernel update.
- Ensure bcm module is updated.
- Review kernel change for specific fix.
- Verify race condition is resolved.
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-2026-72117.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72117 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-2026-72117
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-2026-72117 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72117 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': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '656ff69ef235699035e57d9e1ae417e62a38aa7f', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '136de17f38630307991c59aa7080012a99451783', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': 'c312b750bb5ac3348cfc85dab25e90937bd4d251', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8', 'versionType': 'git'}], 'programFiles': ['net/can/bcm.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.25'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.25', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/can/bcm.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '656ff69ef235699035e57d9e1ae417e62a38aa7f', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '136de17f38630307991c59aa7080012a99451783', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': 'c312b750bb5ac3348cfc85dab25e90937bd4d251', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8', 'versionType': 'git'}], 'programFiles': ['net/can/bcm.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.25'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.25', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/can/bcm.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': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '656ff69ef235699035e57d9e1ae417e62a38aa7f', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '136de17f38630307991c59aa7080012a99451783', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': 'c312b750bb5ac3348cfc85dab25e90937bd4d251', 'versionType': 'git'}, {'status': 'affected', 'version': 'ffd980f976e7fd666c2e61bf8ab35107efd11828', 'lessThan': '58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8', 'versionType': 'git'}], 'programFiles': ['net/can/bcm.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.25'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.25', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/can/bcm.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler() For an rx op subscribed on all interfaces (ifindex == 0), the same op is registered once in the shared per-netns wildcard filter list, so bcm_rx_handler() can run concurrently on different CPUs for frames arriving on different net devices. op->rx_stamp and op->rx_ifindex were written before bcm_rx_update_lock was taken, allowing concurrent writers to race each other - including a torn store of the 64-bit rx_stamp on 32-bit platforms. Beyond a torn store bcm_send_to_user() must report the timestamp/ifindex of the very same frame whose content it is delivering. So the assignment is placed in the same unbroken bcm_rx_update_lock section as the content comparison. As a side effect, the RTR-request frame feature (which never reach bcm_send_to_user()) no longer updates rx_stamp/rx_ifindex, since only the notification path needs them. Added Reference https://git.kernel.org/stable/c/136de17f38630307991c59aa7080012a99451783 Added Reference https://git.kernel.org/stable/c/58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8 Added Reference https://git.kernel.org/stable/c/5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c Added Reference https://git.kernel.org/stable/c/656ff69ef235699035e57d9e1ae417e62a38aa7f Added Reference https://git.kernel.org/stable/c/c312b750bb5ac3348cfc85dab25e90937bd4d251