CVE-2026-80944 (GCVE-0-2026-80944)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3d026d09b28dda24777129a931634949c75a9181
Version: 3d026d09b28dda24777129a931634949c75a9181
Version: 3d026d09b28dda24777129a931634949c75a9181
Version: 3d026d09b28dda24777129a931634949c75a9181
Version: 3d026d09b28dda24777129a931634949c75a9181
Version: 3d026d09b28dda24777129a931634949c75a9181
Version: 3d026d09b28dda24777129a931634949c75a9181
Version: 3d026d09b28dda24777129a931634949c75a9181
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          "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-\u003edata_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-\u003edata_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 -\u003e \"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 -\u003e \"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."
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    "datePublished": "2026-09-11T19:42:16.076Z",
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the observed VERSION_EXT ASCII overwrite already tripped the stack protector.\\nA:H - The bug was observed as a kernel paging fault and stack-protector panic (cmd_wait_q terminated: -512, Kernel panic - not syncing: stack-protector: Kernel stack is corrupted), which is a full host availability loss.\"}]}], \"affected\": [{\"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\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/wireless/marvell/mwifiex/sta_ioctl.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8c67b8c50286e0cb7f18d667e6a37a2ec6e08ff9\"}, {\"url\": \"https://git.kernel.org/stable/c/9024c7729eb523cf4f3a4203966d3a4aaabf030d\"}, {\"url\": \"https://git.kernel.org/stable/c/9e06c9c8a1f10c55d9bc5d139656d58795e64483\"}, {\"url\": \"https://git.kernel.org/stable/c/f2134d6ff30cd6e1bf63d6b0a5d8e0839f0168b3\"}, {\"url\": \"https://git.kernel.org/stable/c/20ee9c03f261bf6ac59331e2ca7b46b23646412a\"}, {\"url\": \"https://git.kernel.org/stable/c/b1bbeb8970eeb6c6bf3cd5314138103f7b69446d\"}, {\"url\": \"https://git.kernel.org/stable/c/d29a165588b6a0cf7a38db5cbd602aef7ef8c658\"}, {\"url\": \"https://git.kernel.org/stable/c/ef06882c7d8a7400b67d0d003b1008093dd589ed\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003edata_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-\u003edata_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 -\u003e \\\"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 -\u003e \\\"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"3.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:45:28.363Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-80944\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:45:28.363Z\", \"dateReserved\": \"2026-08-26T14:34:25.803Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:42:16.076Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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