CVE-2026-98196
wifi: brcmsmac: fix UAF in brcms_free_timer()
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmsmac: fix UAF in brcms_free_timer() brcms_free_timer() calls brcms_del_timer() which uses the non-synchronous cancel_delayed_work() to cancel the timer's underlying delayed work. If the work callback (_brcms_timer) is already running, cancel_delayed_work() returns false without waiting, and brcms_free_timer() proceeds to kfree(t) while the callback still accesses t through container_of(). Add an explicit cancel_delayed_work_sync() after brcms_del_timer() to guarantee that any in-flight callback has completed before the timer structure is freed.
INFO
Published Date :
Oct. 6, 2026, 9:18 a.m.
Last Modified :
Oct. 19, 2026, 10:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply explicit cancel_delayed_work_sync after brcms_del_timer().
- Update the Linux kernel to the patched version.
References to Advisories, Solutions, and Tools
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CVE-2026-98196.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-98196 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-98196
weaknesses.
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The following table lists the changes that have been made to the
CVE-2026-98196 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.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 19, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/98xxx/CVE-2026-98196.json">CVE-2026-98196</a> -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 06, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: wifi: brcmsmac: fix UAF in brcms_free_timer() brcms_free_timer() calls brcms_del_timer() which uses the non-synchronous cancel_delayed_work() to cancel the timer's underlying delayed work. If the work callback (_brcms_timer) is already running, cancel_delayed_work() returns false without waiting, and brcms_free_timer() proceeds to kfree(t) while the callback still accesses t through container_of(). Add an explicit cancel_delayed_work_sync() after brcms_del_timer() to guarantee that any in-flight callback has completed before the timer structure is freed. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/98xxx/CVE-2026-98196.json">CVE-2026-98196</a> Added Reference https://git.kernel.org/stable/c/050d2486e8ed2c0a23b87249ccd23e8072721391 Added Reference https://git.kernel.org/stable/c/10eeb0b29fd7f52487c9ae573e8d79c210a0095d Added Reference https://git.kernel.org/stable/c/1edb3ddd261e973a4d577c0547e63bfa25a8170d Added Reference https://git.kernel.org/stable/c/1eeca1d5e0920fbdad6449768fd2d4364e714180 Added Reference https://git.kernel.org/stable/c/2a4841ff0b74b495cddd31ae324e922217fc2f13 Added Reference https://git.kernel.org/stable/c/74acccc928851f69184271832d690607877122af Added Reference https://git.kernel.org/stable/c/777cb6bba59e875b16a1d8897a483a5fecfcd5d2 Added Reference https://git.kernel.org/stable/c/856dabd5f2617efb23c043be9e1b22a9e6e97c41