314 lines
16 KiB
JSON
314 lines
16 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-2024-45021",
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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": "2024-08-21T05:34:56.684Z",
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"datePublished": "2024-09-11T15:13:55.211Z",
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"dateUpdated": "2026-08-05T11:37:45.912Z"
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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": "2026-08-05T11:37:45.912Z"
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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\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)."
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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:N/A:H",
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"baseScore": 7.1,
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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 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."
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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/memcontrol-v1.c"
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],
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"versions": [
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{
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"version": "0dea116876eefc9c7ca9c5d74fe665481e499fa3",
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"lessThan": "fa5bfdf6cb5846a00e712d630a43e3cf55ccb411",
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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": "0dea116876eefc9c7ca9c5d74fe665481e499fa3",
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"lessThan": "1b37ec85ad95b612307627758c6018cd9d92cca8",
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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": "0dea116876eefc9c7ca9c5d74fe665481e499fa3",
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"lessThan": "ad149f5585345e383baa65f1539d816cd715fd3b",
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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": "0dea116876eefc9c7ca9c5d74fe665481e499fa3",
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"lessThan": "0fbe2a72e853a1052abe9bc2b7df8ddb102da227",
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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": "0dea116876eefc9c7ca9c5d74fe665481e499fa3",
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"lessThan": "43768fa80fd192558737e24ed6548f74554611d7",
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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": "0dea116876eefc9c7ca9c5d74fe665481e499fa3",
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"lessThan": "f1aa7c509aa766080db7ab3aec2e31b1df09e57c",
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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": "0dea116876eefc9c7ca9c5d74fe665481e499fa3",
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"lessThan": "21b578f1d599edb87462f11113c5b0fc7a04ac61",
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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": "0dea116876eefc9c7ca9c5d74fe665481e499fa3",
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"lessThan": "046667c4d3196938e992fba0dfcde570aa85cd0e",
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"status": "affected",
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"versionType": "git"
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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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"mm/memcontrol-v1.c"
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],
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"versions": [
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{
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"version": "2.6.34",
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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": "2.6.34",
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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": "4.19.321",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.283",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.225",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.166",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.107",
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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": "6.6.48",
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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": "6.10.7",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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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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"versionStartIncluding": "2.6.34",
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"versionEndExcluding": "4.19.321"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "5.15.166"
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"references": [
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"url": "https://git.kernel.org/stable/c/fa5bfdf6cb5846a00e712d630a43e3cf55ccb411"
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},
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{
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"url": "https://git.kernel.org/stable/c/1b37ec85ad95b612307627758c6018cd9d92cca8"
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},
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{
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"url": "https://git.kernel.org/stable/c/ad149f5585345e383baa65f1539d816cd715fd3b"
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},
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{
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"url": "https://git.kernel.org/stable/c/0fbe2a72e853a1052abe9bc2b7df8ddb102da227"
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},
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{
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"url": "https://git.kernel.org/stable/c/43768fa80fd192558737e24ed6548f74554611d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/f1aa7c509aa766080db7ab3aec2e31b1df09e57c"
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},
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{
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"url": "https://git.kernel.org/stable/c/21b578f1d599edb87462f11113c5b0fc7a04ac61"
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},
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{
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"url": "https://git.kernel.org/stable/c/046667c4d3196938e992fba0dfcde570aa85cd0e"
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}
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],
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"title": "memcg_write_event_control(): fix a user-triggerable oops",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2024-09-29T15:47:59.119087Z",
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"id": "CVE-2024-45021",
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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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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-29T15:48:13.491Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
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}
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T22:15:30.579Z"
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}
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} |