CVE-2026-80944

Status: ReceivedHigh (7.8)—

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:

Read full descriptionShow less

The fault address decodes as little-endian ASCII:

which is a fragment of the VERSION_EXT firmware string exposed as debugfs "verext":

The same runs also showed corrupted control data containing:

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.

Technical details traces, logs and code from the original report

  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

  0x002c583837384662 -> "bF878X,\0"

  w8997o-V4, RF878X, FP92, 16.92.21.p153.7

  0x2400372e333531 -> "153.7\0$"

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base score: 7.8

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.13%
Percentile among all scored CVEs: 2
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Primary impactT1565.001 Stored Data Manipulationimpact75 %
Secondary impactT1499.004 Application or System Exploitationimpact60 %

Vulnerabilidad local (AV:L/PR:L) que corrompe la pila del kernel al escribir en buffers liberados; permite manipulación de datos del kernel y denegación de servicio por corrupción de memoria.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Threat Intelligence Program Restrict File and Directory Permissions Remote Data Storage Filter Network Traffic Execution Prevention Encrypt Sensitive Information

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-80944",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3d026d09b28dda24777129a931634949c75a9181",
              "lessThan": "8c67b8c50286e0cb7f18d667e6a37a2ec6e08ff9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3d026d09b28dda24777129a931634949c75a9181",
              "lessThan": "9024c7729eb523cf4f3a4203966d3a4aaabf030d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3d026d09b28dda24777129a931634949c75a9181",
              "lessThan": "9e06c9c8a1f10c55d9bc5d139656d58795e64483",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3d026d09b28dda24777129a931634949c75a9181",
              "lessThan": "f2134d6ff30cd6e1bf63d6b0a5d8e0839f0168b3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3d026d09b28dda24777129a931634949c75a9181",
              "lessThan": "20ee9c03f261bf6ac59331e2ca7b46b23646412a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3d026d09b28dda24777129a931634949c75a9181",
              "lessThan": "b1bbeb8970eeb6c6bf3cd5314138103f7b69446d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3d026d09b28dda24777129a931634949c75a9181",
              "lessThan": "d29a165588b6a0cf7a38db5cbd602aef7ef8c658",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3d026d09b28dda24777129a931634949c75a9181",
              "lessThan": "ef06882c7d8a7400b67d0d003b1008093dd589ed",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/wireless/marvell/mwifiex/sta_ioctl.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/wireless/marvell/mwifiex/sta_ioctl.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:18:59.923",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/20ee9c03f261bf6ac59331e2ca7b46b23646412a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8c67b8c50286e0cb7f18d667e6a37a2ec6e08ff9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9024c7729eb523cf4f3a4203966d3a4aaabf030d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9e06c9c8a1f10c55d9bc5d139656d58795e64483",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b1bbeb8970eeb6c6bf3cd5314138103f7b69446d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d29a165588b6a0cf7a38db5cbd602aef7ef8c658",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ef06882c7d8a7400b67d0d003b1008093dd589ed",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f2134d6ff30cd6e1bf63d6b0a5d8e0839f0168b3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: Detach sync cmd buffer on interrupted wait\n\nmwifiex synchronous commands keep the caller-provided data buffer in\ncmd_node->data_buf. Several callers pass stack-allocated objects there.\n\nIf wait_event_interruptible_timeout() is interrupted, the caller can\nreturn and release that stack object while the firmware command is still\nthe current command. A late firmware response then reaches the normal\nresponse handler, which can copy data through cmd_node->data_buf into the\nstale stack address.\n\nThis fixes a stack corruption observed during repeated association and\ndisassociation cycles. The panic trace showed the command wait being\ninterrupted immediately before a bad pointer dereference:\n\n  cmd_wait_q terminated: -512\n  Unable to handle kernel paging request at virtual address 002c583837384662\n  Kernel panic - not syncing: stack-protector: Kernel stack is corrupted\n  ...\n  Tainted: [M]=MACHINE_CHECK\n\nThe fault address decodes as little-endian ASCII:\n\n  0x002c583837384662 -> \"bF878X,\\0\"\n\nwhich is a fragment of the VERSION_EXT firmware string exposed as\ndebugfs \"verext\":\n\n  w8997o-V4, RF878X, FP92, 16.92.21.p153.7\n\nThe same runs also showed corrupted control data containing:\n\n  0x2400372e333531 -> \"153.7\\0$\"\n\nwhich is the tail of the same VERSION_EXT string. This points at a late\nVERSION_EXT response writing through a stale stack-backed data_buf after\nthe interrupted wait returned.\n\nAfter cancelling pending commands on an interrupted or timed-out wait,\ndetach the caller-owned data buffer from the still-current command. This\npreserves the existing command cancellation behaviour while preventing a\nlate response from writing through a pointer whose lifetime ended with the\nwaiting caller.\n\nTested on an i.MX8MP board using an 88W8997."
    }
  ],
  "lastModified": "2026-09-14T13:18:50.287",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}