CVE-2026-23336 (GCVE-0-2026-23336)
Vulnerability from cvelistv5
Published
2026-03-25 10:27
Modified
2026-10-19 18:35
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: cfg80211: cancel rfkill_block work in wiphy_unregister() There is a use-after-free error in cfg80211_shutdown_all_interfaces found by syzkaller: BUG: KASAN: use-after-free in cfg80211_shutdown_all_interfaces+0x213/0x220 Read of size 8 at addr ffff888112a78d98 by task kworker/0:5/5326 CPU: 0 UID: 0 PID: 5326 Comm: kworker/0:5 Not tainted 6.19.0-rc2 #2 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: events cfg80211_rfkill_block_work Call Trace: <TASK> dump_stack_lvl+0x116/0x1f0 print_report+0xcd/0x630 kasan_report+0xe0/0x110 cfg80211_shutdown_all_interfaces+0x213/0x220 cfg80211_rfkill_block_work+0x1e/0x30 process_one_work+0x9cf/0x1b70 worker_thread+0x6c8/0xf10 kthread+0x3c5/0x780 ret_from_fork+0x56d/0x700 ret_from_fork_asm+0x1a/0x30 </TASK> The problem arises due to the rfkill_block work is not cancelled when wiphy is being unregistered. In order to fix the issue cancel the corresponding work in wiphy_unregister(). Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3
Version: 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3
Version: 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3
Version: 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3
Version: 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3
Version: 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3
Version: 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3
Version: 1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3
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    "cveId": "CVE-2026-23336",
    "datePublished": "2026-03-25T10:27:26.061Z",
    "dateReserved": "2026-01-13T15:37:45.997Z",
    "dateUpdated": "2026-10-19T18:35:41.752Z",
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  "vulnerability-lookup:meta": {
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Not remotely reachable through WiFi frames \\u2014 it\u0027s a driver management race condition.\\nAC:L - The attacker controls both sides of the race \\u2014 device insertion triggers rfkill hardware state changes, and device removal triggers wiphy_unregister(). A crafted USB WiFi device can reliably trigger both events in the needed sequence.\\nPR:L - A local user with access to USB ports or device management interfaces can trigger device attachment/removal. No root/CAP_NET_ADMIN is needed to plug in a USB WiFi device on shared workstations.\\nUI:N - No user interaction is required; the attacker triggers both the rfkill state change and the device unregistration autonomously.\\nS:U - Standard kernel vulnerability \\u2014 the impact remains within the same security authority (kernel space). No VM escape or sandbox boundary crossing.\\nC:H - This is a use-after-free where the attacker can control freed heap contents through heap spraying, enabling arbitrary memory reads via the freed rdev structure.\\nI:H - The UAF accesses freed memory that iterates a list and calls dev_close() on network devices. With heap spray, the attacker can redirect function pointers for arbitrary code execution in kernel context.\\nA:H - The kernel crash is confirmed by the KASAN report showing a use-after-free read in cfg80211_shutdown_all_interfaces. Any UAF reliably causes kernel oops/panic.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3\", \"lessThan\": \"82a35356b5c1f75fe6a8a561db44e8d0e49da8f9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3\", \"lessThan\": \"b2e9626a9d16b9bbbd06498c9e73c93be354dc7a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3\", \"lessThan\": \"eeea8da43ab86ac0a6b9cec225eec91564346940\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3\", \"lessThan\": \"fa18639deab4a3662d543200c5bfc29bf4e23173\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3\", \"lessThan\": \"57e39fe8da573435fa35975f414f4dc17d9f8449\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3\", \"lessThan\": \"584279ad9ff1e8e7c5494b9fce286201f7d1f9e2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3\", \"lessThan\": \"cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f87f7d3a3b42b20f34cb03f0fd1a41c3d0e27f3\", \"lessThan\": \"767d23ade706d5fa51c36168e92a9c5533c351a1\", \"versionType\": \"git\"}], \"programFiles\": [\"net/wireless/core.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.31\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.31\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.253\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.203\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.167\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.130\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.77\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.17\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/wireless/core.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/82a35356b5c1f75fe6a8a561db44e8d0e49da8f9\"}, {\"url\": \"https://git.kernel.org/stable/c/b2e9626a9d16b9bbbd06498c9e73c93be354dc7a\"}, {\"url\": \"https://git.kernel.org/stable/c/eeea8da43ab86ac0a6b9cec225eec91564346940\"}, {\"url\": \"https://git.kernel.org/stable/c/fa18639deab4a3662d543200c5bfc29bf4e23173\"}, {\"url\": \"https://git.kernel.org/stable/c/57e39fe8da573435fa35975f414f4dc17d9f8449\"}, {\"url\": \"https://git.kernel.org/stable/c/584279ad9ff1e8e7c5494b9fce286201f7d1f9e2\"}, {\"url\": \"https://git.kernel.org/stable/c/cd2f52944c7b95dcdfe0d87f385a2d96458a3ae5\"}, {\"url\": \"https://git.kernel.org/stable/c/767d23ade706d5fa51c36168e92a9c5533c351a1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: cfg80211: cancel rfkill_block work in wiphy_unregister()\\n\\nThere is a use-after-free error in cfg80211_shutdown_all_interfaces found\\nby syzkaller:\\n\\nBUG: KASAN: use-after-free in cfg80211_shutdown_all_interfaces+0x213/0x220\\nRead of size 8 at addr ffff888112a78d98 by task kworker/0:5/5326\\nCPU: 0 UID: 0 PID: 5326 Comm: kworker/0:5 Not tainted 6.19.0-rc2 #2 PREEMPT(voluntary)\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\\nWorkqueue: events cfg80211_rfkill_block_work\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x116/0x1f0\\n print_report+0xcd/0x630\\n kasan_report+0xe0/0x110\\n cfg80211_shutdown_all_interfaces+0x213/0x220\\n cfg80211_rfkill_block_work+0x1e/0x30\\n process_one_work+0x9cf/0x1b70\\n worker_thread+0x6c8/0xf10\\n kthread+0x3c5/0x780\\n ret_from_fork+0x56d/0x700\\n ret_from_fork_asm+0x1a/0x30\\n \u003c/TASK\u003e\\n\\nThe problem arises due to the rfkill_block work is not cancelled when wiphy\\nis being unregistered. In order to fix the issue cancel the corresponding\\nwork in wiphy_unregister().\\n\\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.253\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.203\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.167\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.130\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.77\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.17\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.7\", \"versionStartIncluding\": \"2.6.31\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"2.6.31\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:21:13.568Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23336\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:35:41.752Z\", \"dateReserved\": \"2026-01-13T15:37:45.997Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-03-25T10:27:26.061Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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