{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-43888", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-17T09:11:59.288Z", "datePublished": "2024-08-26T10:10:40.890Z", "dateUpdated": "2026-08-05T11:36:59.850Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:59.850Z" }, "descriptions": [ { "lang": "en", "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]" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/list_lru.c" ], "versions": [ { "version": "0a97c01cd20bb96359d8c9dedad92a061ed34e0b", "lessThan": "4589f77c18dd98b65f45617b6d1e95313cf6fcab", "status": "affected", "versionType": "git" }, { "version": "0a97c01cd20bb96359d8c9dedad92a061ed34e0b", "lessThan": "5161b48712dcd08ec427c450399d4d1483e21dea", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/list_lru.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.5", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.10.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4589f77c18dd98b65f45617b6d1e95313cf6fcab" }, { "url": "https://git.kernel.org/stable/c/5161b48712dcd08ec427c450399d4d1483e21dea" } ], "title": "mm: list_lru: fix UAF for memory cgroup", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-43888", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:31:59.160632Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:32:58.783Z" } } ] } }