487 lines
23 KiB
JSON
487 lines
23 KiB
JSON
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"cveId": "CVE-2026-43499",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-01T14:12:56.014Z",
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"datePublished": "2026-05-21T12:17:49.281Z",
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"dateUpdated": "2026-11-10T12:46:43.832Z"
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},
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{
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"lang": "en",
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"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's 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 ]"
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{
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"lang": "en",
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"value": "AV:L - The vulnerable code is reached through the futex(2) syscall (FUTEX_CMP_REQUEUE_PI → futex_requeue → 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's control.\nPR:L - Any basic unprivileged local user can call futex() with FUTEX_CMP_REQUEUE_PI — no capabilities, root, or namespaces are required.\nUI:N - The bug is triggered entirely by the attacker's 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."
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}
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"version": "V3.1.7",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |