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CVE-2026-31551:
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CVE-2026-31551 | Medium Severity | Armis
CVE-2026-31551:
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: Fix static_branch_dec() underflow for aql_disable.
syzbot reported static_branch_dec() underflow in aql_enable_write(). [0]
The problem is that aql_enable_write() does not serialise concurrent
write()s to the debugfs.
aql_enable_write() checks static_key_false(&aql_disable.key) and
later calls static_branch_inc() or static_branch_dec(), but the
state may change between the two calls.
aql_disable does not need to track inc/dec.
Let's use static_branch_enable() and static_branch_disable().
A numerical rating that indicates how dangerous this vulnerability is.
5.5Medium
Published Date:Apr 24, 2026
CISA KEV Date:*No Data*
Industries Affected:20
Threat Predictions
EPSS Score:0.0
EPSS Percentile:2%
Exploitability
Score:1.8
Attack Vector:LOCAL
Attack Complexity:LOW
Privileges Required:LOW
User Interaction:NONE
Scope:UNCHANGED
Impact
Score:3.6
Confidentiality Impact:NONE
Integrity Impact:NONE
Availability Impact:HIGH
Description Preview
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: Fix static_branch_dec() underflow for aql_disable.
syzbot reported static_branch_dec() underflow in aql_enable_write(). [0]
The problem is that aql_enable_write() does not serialise concurrent
write()s to the debugfs.
aql_enable_write() checks static_key_false(&aql_disable.key) and
later calls static_branch_inc() or static_branch_dec(), but the
state may change between the two calls.
aql_disable does not need to track inc/dec.
Let's use static_branch_enable() and static_branch_disable().
