188 lines
9.9 KiB
JSON
188 lines
9.9 KiB
JSON
{
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"cveMetadata": {
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"cveId": "CVE-2024-43888",
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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": "2024-08-17T09:11:59.288Z",
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"datePublished": "2024-08-26T10:10:40.890Z",
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"dateUpdated": "2026-10-21T12:35:08.851Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-10-21T12:35:08.851Z"
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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\nmm: list_lru: fix UAF for memory cgroup\n\nThe mem_cgroup_from_slab_obj() is supposed to be called under rcu lock or\ncgroup_mutex or others which could prevent returned memcg from being\nfreed. Fix it by adding missing rcu read lock.\n\nFound by code inspection.\n\n[songmuchun@bytedance.com: only grab rcu lock when necessary, per Vlastimil]"
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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 vulnerable code is reached through ordinary filesystem syscalls (open/stat/close/unlink driving d_lru_add/d_lru_del and inode LRU add/del) plus local cgroup manipulation to trigger the memcg teardown. No network peer can drive the memcg-free side of the race, so this requires local system access.\nAC:L - The attacker controls both sides of the race — one thread rmdirs a cgroup it created to force memcg offline and RCU-deferred free, while another thread loops dentry/inode LRU operations on objects charged to that memcg — and can retry indefinitely. On CONFIG_PREEMPT and especially PREEMPT_RT kernels (where list_lru_add's spin_lock is a sleeping rtmutex) the window between reading objcg->memcg and dereferencing it is readily hit.\nPR:L - Only an unprivileged local account is needed: the LRU paths are hit by unprivileged file operations with no capability check, and cgroup creation/removal is available to normal users via systemd's delegated user slice or to any container tenant. No real root is required anywhere on the path.\nUI:N - The attacker's own threads perform every step — populating a cgroup, tearing it down, and hammering the dentry/inode LRU paths. No victim action is involved.\nS:U - The use-after-free corrupts kernel memory managed by the same kernel security authority; there is no VM, IOMMU, or hypervisor boundary crossed.\nC:H - Reading memcg->kmemcg_id from freed memory steers list_lru_from_memcg_idx() into another cgroup's LRU, exposing and cross-linking objects across memcg boundaries, and a groomed reallocation of the freed mem_cgroup gives the attacker control over the pointer chain, which is leverageable for arbitrary kernel memory disclosure.\nI:H - set_shrinker_bit() performs set_bit() through memcg->nodeinfo[nid]->shrinker_info read from the freed object, so a reallocated and attacker-controlled mem_cgroup turns this into a write primitive at a chosen address; the wrong-index list_add_tail()/list_del_init() also corrupt live list_lru state.\nA:H - A garbage kmemcg_id makes xa_load() return NULL and list_add_tail() dereference it, producing an immediate kernel oops, and the resulting list_lru list corruption and nr_items underflow crash the shrinker later — a repeatable panic on core dcache/icache paths."
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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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"mm/list_lru.c"
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],
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"versions": [
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{
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"version": "0a97c01cd20bb96359d8c9dedad92a061ed34e0b",
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"status": "affected",
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"status": "affected",
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},
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{
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"version": "32d7120a499d475bc03e893c59611116279bcfb8",
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"status": "affected",
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},
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{
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"version": "6.6.160",
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"lessThan": "6.7",
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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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"product": "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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"mm/list_lru.c"
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],
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"versions": [
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"version": "6.8",
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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": "6.8",
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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": "6.10.5",
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"lessThanOrEqual": "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": "6.11",
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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": "6.8",
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"versionEndExcluding": "6.10.5"
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]
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4589f77c18dd98b65f45617b6d1e95313cf6fcab"
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},
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{
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"url": "https://git.kernel.org/stable/c/5161b48712dcd08ec427c450399d4d1483e21dea"
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}
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],
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"title": "mm: list_lru: fix UAF for memory cgroup",
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"x_generator": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-43888",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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{
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"Technical Impact": "partial"
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"version": "2.0.3",
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"timestamp": "2024-09-10T15:31:59.160632Z"
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}
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"title": "CISA ADP Vulnrichment",
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