CVE-2026-43499 (GCVE-0-2026-43499)
Vulnerability from cvelistv5
Published
2026-05-21 12:17
Modified
2026-08-26 19:01
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: rtmutex: Use waiter::task instead of current in remove_waiter() remove_waiter() is used by the slowlock paths, but it is also used for proxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from futex_requeue(). In the latter case waiter::task is not current, but remove_waiter() operates on current for the dequeue operation. That results in several problems: 1) the rbtree dequeue happens without waiter::task::pi_lock being held 2) the waiter task's pi_blocked_on state is not cleared, which leaves a dangling pointer primed for UAF around. 3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter task Use waiter::task instead of current in all related operations in remove_waiter() to cure those problems. [ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the changelog ]
References
Impacted products
Vendor Product Version
Linux Linux Version: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693
Version: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693
Version: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693
Version: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693
Version: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693
Version: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693
Version: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693
Version: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693
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The vulnerable code is reached through the futex(2) syscall (FUTEX_CMP_REQUEUE_PI \\u2192 futex_requeue \\u2192 rt_mutex_start_proxy_lock), which requires local access to issue syscalls and is not reachable over any network.\\nAC:L - The attacker controls all the threads and PI-futexes involved and can deterministically construct the deadlock-detection error that drives the proxy-lock rollback into remove_waiter(); the resulting UAF/corruption is reliably triggerable without depending on conditions outside the attacker\u0027s control.\\nPR:L - Any basic unprivileged local user can call futex() with FUTEX_CMP_REQUEUE_PI \\u2014 no capabilities, root, or namespaces are required.\\nUI:N - The bug is triggered entirely by the attacker\u0027s own threads and syscalls; no action by any other user is needed.\\nS:U - The corruption is confined to kernel memory within the same security authority; it is a standard local kernel privilege issue with no cross-boundary (VM/IOMMU) escape.\\nC:H - The dangling pi_blocked_on pointer and rbtree dequeue under the wrong pi_lock give a use-after-free over reclaimed stack memory, which can be leveraged to read controlled kernel memory contents.\\nI:H - The UAF and unsynchronized rbtree manipulation provide a write primitive into kernel data structures, enabling memory corruption exploitable for control-flow hijacking and privilege escalation.\\nA:H - The dangling pointer dereference and PI-chain corruption readily cause kernel oops/panic, so availability impact is high.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\", \"lessThan\": \"f3fa3424bceb128d2be4b3745506b22844b87db7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\", \"lessThan\": \"838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\", \"lessThan\": \"d8cce4773c2b23d819baf5abedc62f7b430e8745\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\", \"lessThan\": \"8a1fc8d698ac5e5916e3082a0f74450d71f9611f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\", \"lessThan\": \"6d52dfcb2a5db86e346cf51f8fcf2071b8085166\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\", \"lessThan\": \"3fb7394a837740770f0d6b4b30567e60786a63f2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\", \"lessThan\": \"88614876370aac8ad1050ad785a4c095ba17ac11\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\", \"lessThan\": \"3bfdc63936dd4773109b7b8c280c0f3b5ae7d349\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/locking/rtmutex.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.39\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.39\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.140\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.86\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.27\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/locking/rtmutex.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f3fa3424bceb128d2be4b3745506b22844b87db7\"}, {\"url\": \"https://git.kernel.org/stable/c/838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd\"}, {\"url\": \"https://git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745\"}, {\"url\": \"https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f\"}, {\"url\": \"https://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166\"}, {\"url\": \"https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2\"}, {\"url\": \"https://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11\"}, {\"url\": \"https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrtmutex: Use waiter::task instead of current in remove_waiter()\\n\\nremove_waiter() is used by the slowlock paths, but it is also used for\\nproxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from\\nfutex_requeue().\\n\\nIn the latter case waiter::task is not current, but remove_waiter()\\noperates on current for the dequeue operation. That results in several\\nproblems:\\n\\n  1) the rbtree dequeue happens without waiter::task::pi_lock being held\\n\\n  2) the waiter task\u0027s pi_blocked_on state is not cleared, which leaves a\\n     dangling pointer primed for UAF around.\\n\\n  3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter\\n     task\\n\\nUse waiter::task instead of current in all related operations in\\nremove_waiter() to cure those problems.\\n\\n[ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the\\n  \\tchangelog ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.140\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.86\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.27\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.4\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"2.6.39\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:28:22.054Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43499\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-26T19:01:26.917Z\", \"dateReserved\": \"2026-05-01T14:12:56.014Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-21T12:17:49.281Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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