Bug 2513182 (CVE-2026-68198)

Summary: CVE-2026-68198 kernel: Linux kernel: Use-after-free in ath6kl Wi-Fi driver leading to denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's ath6kl Wi-Fi driver. A use-after-free vulnerability exists within the `aggr_reset_state()` function. This occurs because a non-synchronous timer deletion allows a timer callback (`aggr_timeout`) to access memory that has already been freed, creating a race condition. An attacker could potentially exploit this to cause system instability or a denial of service.
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Description OSIDB Bzimport 2026-08-10 12:23:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: ath6kl: fix use-after-free in aggr_reset_state()

The aggr_reset_state() function uses timer_delete() (non-synchronous)
for the aggregation timer before proceeding to delete TID state and
before the structure is freed by callers like aggr_module_destroy().

If the timer callback (aggr_timeout) is executing when aggr_reset_state()
is called, the callback will continue to access aggr_conn fields like
rx_tid[] and stat[] which may be freed immediately after by
kfree(aggr_info->aggr_conn) in aggr_module_destroy().

Additionally, the timer callback can re-arm itself via mod_timer() while
aggr_reset_state() is running, creating a more complex race condition.

Use timer_delete_sync() instead to ensure any running timer callback
has completed before returning.