{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-45021", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T05:34:56.684Z", "datePublished": "2024-09-11T15:13:55.211Z", "dateUpdated": "2026-08-05T11:37:45.912Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:37:45.912Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemcg_write_event_control(): fix a user-triggerable oops\n\nwe are *not* guaranteed that anything past the terminating NUL\nis mapped (let alone initialized with anything sane)." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerability is triggered by a write(2) to the cgroup v1 file `cgroup.event_control` on a locally mounted cgroupfs hierarchy. There is no network-reachable path to `memcg_write_event_control()`.\nAC:L - The attacker fully controls the write length and content, so the out-of-bounds read past the end of the `kmalloc(len+1)` buffer is 100% deterministic; sizing the write to exactly 4095 bytes places the buffer at a page boundary, and heap/page grooming lets the attacker steer the unbounded `memparse()` walk into an unmapped page. cgroup v1 with the memory controller is a widely deployed default (Android, legacy/hybrid systemd, embedded), not a rare config.\nPR:L - `cgroup.event_control` was flagged `CFTYPE_WORLD_WRITABLE` (mode 0666), so any unprivileged local user can write it wherever a cgroup v1 memory hierarchy is mounted; additionally `cgroup_fs_type` has `FS_USERNS_MOUNT` and `cgroup1_get_tree()` only requires `ns_capable(user_ns, CAP_SYS_ADMIN)`, obtainable via `unshare -Urmc`.\nUI:N - A single write() syscall from the attacker's own process triggers the bug; no victim action, mount by an administrator, or other user involvement is required.\nS:U - The out-of-bounds read and the resulting oops occur entirely within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The read runs off the end of the slab object and, via `memparse()`/`simple_strtoull()`, continues unbounded until a non-digit byte (and up to 19 bytes via `kstrndup()` on the vmpressure path), so it is not strictly bounded to a few bytes. The parsed adjacent-heap value is installed as a memcg usage threshold that the attacker can read back by driving cgroup memory usage and observing eventfd notifications, giving a genuine kernel-memory disclosure channel.\nI:N - The defect is purely an out-of-bounds read; no memory is written out of bounds and no attacker-controlled write primitive is created. The only state change is a threshold value inside the attacker's own cgroup, which they could already set directly by supplying an explicit args field.\nA:H - The unbounded read past a page-aligned kmalloc-4k object can reach an unmapped page and produce a kernel oops, exactly as described by the fix (\"user-triggerable oops\"); on KASAN or DEBUG_PAGEALLOC kernels the fault is deterministic and repeatable." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/memcontrol-v1.c" ], "versions": [ { "version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "lessThan": "fa5bfdf6cb5846a00e712d630a43e3cf55ccb411", "status": "affected", "versionType": "git" }, { "version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "lessThan": "1b37ec85ad95b612307627758c6018cd9d92cca8", "status": "affected", "versionType": "git" }, { "version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "lessThan": "ad149f5585345e383baa65f1539d816cd715fd3b", "status": "affected", "versionType": "git" }, { "version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "lessThan": "0fbe2a72e853a1052abe9bc2b7df8ddb102da227", "status": "affected", "versionType": "git" }, { "version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "lessThan": "43768fa80fd192558737e24ed6548f74554611d7", "status": "affected", "versionType": "git" }, { "version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "lessThan": "f1aa7c509aa766080db7ab3aec2e31b1df09e57c", "status": "affected", "versionType": "git" }, { "version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "lessThan": "21b578f1d599edb87462f11113c5b0fc7a04ac61", "status": "affected", "versionType": "git" }, { "version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "lessThan": "046667c4d3196938e992fba0dfcde570aa85cd0e", "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/memcontrol-v1.c" ], "versions": [ { "version": "2.6.34", "status": "affected" }, { "version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.321", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.283", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.225", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.166", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.107", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.48", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.7", "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": "2.6.34", "versionEndExcluding": "4.19.321" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.4.283" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.10.225" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.15.166" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.1.107" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.6.48" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.10.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fa5bfdf6cb5846a00e712d630a43e3cf55ccb411" }, { "url": "https://git.kernel.org/stable/c/1b37ec85ad95b612307627758c6018cd9d92cca8" }, { "url": "https://git.kernel.org/stable/c/ad149f5585345e383baa65f1539d816cd715fd3b" }, { "url": "https://git.kernel.org/stable/c/0fbe2a72e853a1052abe9bc2b7df8ddb102da227" }, { "url": "https://git.kernel.org/stable/c/43768fa80fd192558737e24ed6548f74554611d7" }, { "url": "https://git.kernel.org/stable/c/f1aa7c509aa766080db7ab3aec2e31b1df09e57c" }, { "url": "https://git.kernel.org/stable/c/21b578f1d599edb87462f11113c5b0fc7a04ac61" }, { "url": "https://git.kernel.org/stable/c/046667c4d3196938e992fba0dfcde570aa85cd0e" } ], "title": "memcg_write_event_control(): fix a user-triggerable oops", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-29T15:47:59.119087Z", "id": "CVE-2024-45021", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-29T15:48:13.491Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html" } ], "providerMetadata": 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