CVE-2026-80944wifi: mwifiex: Detach sync cmd buffer on interrupted wait
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: Detach sync cmd buffer on interrupted wait mwifiex synchronous commands keep the caller-provided data buffer in cmd_node->data_buf. Several callers pass stack-allocated objects there. If wait_event_interruptible_timeout() is interrupted, the caller can return and release that stack object while the firmware command is still the current command. A late firmware response then reaches the normal response handler, which can copy data through cmd_node->data_buf into the stale stack address. This fixes a stack corruption observed during repeated association and disassociation cycles. The panic trace showed the command wait being interrupted immediately before a bad pointer dereference: cmd_wait_q terminated: -512 Unable to handle kernel paging request at virtual address 002c583837384662 Kernel panic - not syncing: stack-protector: Kernel stack is corrupted ... Tainted: [M]=MACHINE_CHECK The fault address decodes as little-endian ASCII: 0x002c583837384662 -> "bF878X,\0" which is a fragment of the VERSION_EXT firmware string exposed as debugfs "verext": w8997o-V4, RF878X, FP92, 16.92.21.p153.7 The same runs also showed corrupted control data containing: 0x2400372e333531 -> "153.7\0$" which is the tail of the same VERSION_EXT string. This points at a late VERSION_EXT response writing through a stale stack-backed data_buf after the interrupted wait returned. After cancelling pending commands on an interrupted or timed-out wait, detach the caller-owned data buffer from the still-current command. This preserves the existing command cancellation behaviour while preventing a late response from writing through a pointer whose lifetime ended with the waiting caller. Tested on an i.MX8MP board using an 88W8997.
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 3d026d09b28dda24777129a931634949c75a9181 – < 8c67b8c50286e0cb7f18d667e6a37a2ec6e08ff9
- affected 3d026d09b28dda24777129a931634949c75a9181 – < 9024c7729eb523cf4f3a4203966d3a4aaabf030d
- affected 3d026d09b28dda24777129a931634949c75a9181 – < 9e06c9c8a1f10c55d9bc5d139656d58795e64483
- affected 3d026d09b28dda24777129a931634949c75a9181 – < f2134d6ff30cd6e1bf63d6b0a5d8e0839f0168b3
- affected 3d026d09b28dda24777129a931634949c75a9181 – < 20ee9c03f261bf6ac59331e2ca7b46b23646412a
- affected 3d026d09b28dda24777129a931634949c75a9181 – < b1bbeb8970eeb6c6bf3cd5314138103f7b69446d
- affected 3d026d09b28dda24777129a931634949c75a9181 – < d29a165588b6a0cf7a38db5cbd602aef7ef8c658
- affected 3d026d09b28dda24777129a931634949c75a9181 – < ef06882c7d8a7400b67d0d003b1008093dd589ed
- affected 3.15
- unaffected < 3.15
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/8c67b8c50286e0cb7f18d667e6a37a2ec6e08ff9 (opens in a new tab)
- https://git.kernel.org/stable/c/9024c7729eb523cf4f3a4203966d3a4aaabf030d (opens in a new tab)
- https://git.kernel.org/stable/c/9e06c9c8a1f10c55d9bc5d139656d58795e64483 (opens in a new tab)
- https://git.kernel.org/stable/c/f2134d6ff30cd6e1bf63d6b0a5d8e0839f0168b3 (opens in a new tab)
- https://git.kernel.org/stable/c/20ee9c03f261bf6ac59331e2ca7b46b23646412a (opens in a new tab)
- https://git.kernel.org/stable/c/b1bbeb8970eeb6c6bf3cd5314138103f7b69446d (opens in a new tab)
- https://git.kernel.org/stable/c/d29a165588b6a0cf7a38db5cbd602aef7ef8c658 (opens in a new tab)
- https://git.kernel.org/stable/c/ef06882c7d8a7400b67d0d003b1008093dd589ed (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76267 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-80944)Record last updated .