CVE-2024-43888

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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 \u2014 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 \u2014 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 \u2014 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 \u2014 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"}, {"version": "32d7120a499d475bc03e893c59611116279bcfb8", "status": "affected", "versionType": "git"}, {"version": "6.6.160", "lessThan": "6.7", "status": "affected", "versionType": "semver"}]}, {"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.160"}]}]}], "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"}}]}}

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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 \u2014 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 \u2014 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 \u2014 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 \u2014 a repeatable panic on core dcache/icache paths."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0a97c01cd20bb96359d8c9dedad92a061ed34e0b", "lessThan": "4589f77c18dd98b65f45617b6d1e95313cf6fcab", "versionType": "git"}, {"status": "affected", "version": "0a97c01cd20bb96359d8c9dedad92a061ed34e0b", "lessThan": "5161b48712dcd08ec427c450399d4d1483e21dea", "versionType": "git"}, {"status": "affected", "version": "32d7120a499d475bc03e893c59611116279bcfb8", "versionType": "git"}, {"status": "affected", "version": "6.6.160", "lessThan": "6.7", "versionType": "semver"}], "programFiles": ["mm/list_lru.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"status": "unaffected", "version": "0", "lessThan": "6.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.10.5", "versionType": "semver", "lessThanOrEqual": "6.10.*"}, {"status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["mm/list_lru.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4589f77c18dd98b65f45617b6d1e95313cf6fcab"}, {"url": "https://git.kernel.org/stable/c/5161b48712dcd08ec427c450399d4d1483e21dea"}], "x_generator": {"engine": "bippy-1.2.0"}, "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]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10.5", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.6.160"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:35:08.851Z"}}}, "cveMetadata": {"cveId": "CVE-2024-43888", "state": "PUBLISHED", "dateUpdated": "2026-10-21T12:35:08.851Z", "dateReserved": "2024-08-17T09:11:59.288Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-08-26T10:10:40.890Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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{"affected_release": [{"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: mm: list_lru: fix UAF for memory cgroup", "id": "2307861", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2307861"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm: list_lru: fix UAF for memory cgroup\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.\nFound by code inspection.\n[songmuchun@bytedance.com: only grab rcu lock when necessary, per Vlastimil]"], "name": "CVE-2024-43888", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-43888\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-43888\nhttps://lore.kernel.org/linux-cve-announce/2024082659-CVE-2024-43888-5beb@gregkh/T"], "threat_severity": "Moderate"}

{}