234 lines
13 KiB
JSON
234 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80521",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.763Z",
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"datePublished": "2026-08-26T14:37:02.589Z",
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"dateUpdated": "2026-10-03T10:56:06.656Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-03T10:56:06.656Z"
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},
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"descriptions": [
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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\naf_unix: Unlink scc_entry in unix_del_edge().\n\nKyle Zeng reported that GC could free a dead SCC partially.\n\nThe scenario is as follows:\n\n 1) Create two SCCs:\n\n X -. A <-> B\n ^--'\n\n 2) Run the following concurrently:\n\n 2-1) send() sk-B to sk-B from sk-X\n 2-2) close() both A and B\n\nAt 2-1), there is a small window where unix_add_edges()\npublishes a new edge (B <-> B) to GC but its skb is not queued\nby skb_queue_tail().\n\nIf 2-2) completes before skb_queue_tail() and GC is triggered,\nit judges A <-> B as dead, but B is not freed because GC cannot\ncollect the not-yet-queued skb holding the B <-> B edge.\n\n X -. A <-> B -. This edge is visible\n ^--' ^..' but skb is not\n\nThis itself is not a problem since the next GC run will judge\nB as dead as well and free it finally.\n\n X -. A <.> B -.\n ^--' ^--'\n\nHowever, X's SCC forces the next GC to call unix_walk_scc_fast(),\nand it iterates over A through B's scc_entry.\n\nLet's unlink scc_entry before freeing the vertex in unix_del_edge()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is only reachable through local AF_UNIX syscalls (socket/sendmsg with SCM_RIGHTS and close) that drive unix_add_edges(), unix_del_edge(), and unix_gc(); AF_UNIX is host-local IPC with no remote packet, Bluetooth, WiFi, or physical bus entry path.\nAC:L - Exploitation requires racing sendmsg() (scm_stat_add/unix_add_edges before skb_queue_tail) against concurrent close() that triggers GC; the attacker controls both threads, can pin CPUs, and can retry until the window is hit, so success does not depend on conditions outside attacker control.\nPR:L - An unprivileged local user can create AF_UNIX sockets, pass socket file descriptors via SCM_RIGHTS to form inflight reference cycles, and close sockets to schedule unix_gc(); no real-root capabilities, special namespaces, or non-default kernel configuration are required.\nUI:N - The attacker sets up the cyclic inflight graph, performs the concurrent self-send and close operations, and forces garbage collection from its own processes; no separate victim user action or cooperating peer is needed beyond the attacker's own sockets.\nS:U - The use-after-free corrupts kernel heap/list state during AF_UNIX garbage collection within the same kernel security authority; exploitation yields standard local privilege escalation rather than crossing a VM, IOMMU, or inter-tenant sandbox boundary.\nC:H - Freed struct unix_vertex objects remain linked through stale scc_entry; unix_walk_scc_fast(), unix_scc_dead(), and unix_collect_skb() dereference freed vertex->edges and predecessor socket receive queues, giving a slab UAF read primitive controllable through heap grooming.\nI:H - The same UAF enables reclaiming freed vertices and influencing GC list iteration and skb_queue_splice_init() during unix_collect_skb(), providing memory corruption primitives suitable for arbitrary kernel writes, control-flow hijack, and local privilege escalation.\nA:H - Iterating or collecting through a freed vertex reliably triggers kernel oops/panic (KASAN slab-use-after-free), and corrupt GC graph state can crash the host or deny service to local workloads even when full exploitation is not attempted."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/unix/garbage.c"
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],
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"versions": [
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{
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"version": "5dfd283f4651d04dbb70ceb9ae5c4a30eda3c52a",
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"lessThan": "2b6c2842692d08e7acaf32d1eb47f95def35f3fe",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "de7921631ff323369aa63a4324695ab54ea4047e",
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"lessThan": "6fda5c51b8e43a8440f76e65c89d9f95ddb2ef33",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4090fa373f0e763c43610853d2774b5979915959",
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"lessThan": "1293fd69a50d188a5788b08ba3741a3e86be1608",
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"status": "affected",
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"versionType": "git"
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"lessThan": "fe198b077864feafd4aa4b33b1a5ce26f50195a2",
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"status": "affected",
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"versionType": "git"
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{
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"version": "4090fa373f0e763c43610853d2774b5979915959",
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"lessThan": "e3702470ced94fad74d71e2232f022d2eb752a6d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4090fa373f0e763c43610853d2774b5979915959",
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"lessThan": "594d905195024b228c962627ae5ae7c17bd582a4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.1.141",
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"lessThan": "6.1.189",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.93",
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"lessThan": "6.6.158",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/unix/garbage.c"
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],
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"versions": [
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{
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"version": "6.10",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.10",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.10",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.141",
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"versionEndExcluding": "6.1.189"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/2b6c2842692d08e7acaf32d1eb47f95def35f3fe"
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},
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{
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"url": "https://git.kernel.org/stable/c/6fda5c51b8e43a8440f76e65c89d9f95ddb2ef33"
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},
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{
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"url": "https://git.kernel.org/stable/c/1293fd69a50d188a5788b08ba3741a3e86be1608"
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},
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{
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"url": "https://git.kernel.org/stable/c/fe198b077864feafd4aa4b33b1a5ce26f50195a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3702470ced94fad74d71e2232f022d2eb752a6d"
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},
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{
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"url": "https://git.kernel.org/stable/c/594d905195024b228c962627ae5ae7c17bd582a4"
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}
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],
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"title": "af_unix: Unlink scc_entry in unix_del_edge().",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |