181 lines
9.7 KiB
JSON
181 lines
9.7 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-2023-53838",
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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": "2025-12-09T01:27:17.826Z",
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"datePublished": "2025-12-09T01:29:54.419Z",
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"dateUpdated": "2026-08-05T09:16:21.177Z"
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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": "2026-08-05T09:16:21.177Z"
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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\nf2fs: synchronize atomic write aborts\n\nTo fix a race condition between atomic write aborts, I use the inode\nlock and make COW inode to be re-usable thoroughout the whole\natomic file inode lifetime."
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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 race is driven entirely through local syscalls — `ioctl(F2FS_IOC_START_ATOMIC_WRITE/ABORT_ATOMIC_WRITE)` and `close()` — on a file residing on a mounted f2fs filesystem. No network or physical access is involved.\nAC:L - The attacker owns both sides of the race: it issues the unlocked `->release` abort from its own `close()` in one thread while issuing the `inode_lock`-held abort ioctl from another, and can retry the loop indefinitely at no cost. The `inode_lock` provides no exclusion against the release path, so the window is wide and deterministic to hit.\nPR:L - `__f2fs_ioctl` gates the atomic-write ioctls only on `inode_owner_or_capable()`, which any unprivileged local user satisfies for a file they created on an f2fs mount (e.g. any Android app under /data). No capability, mount option, or crafted image is required.\nUI:N - The attacker performs every step itself — create file, start atomic write, race close against the abort ioctl. No victim action or cooperating process is needed; f2fs simply being mounted is an environmental default, not user interaction.\nS:U - The corruption stays within the kernel's own security authority — a freed `struct inode` in `f2fs_inode_cachep`. There is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The double `iput()` frees the COW `struct inode` while another thread still dereferences it, and `prepare_atomic_write_begin()` continues reading through the dangling `fi->cow_inode`. Reclaiming the freed slot with attacker-groomed objects gives an arbitrary kernel read primitive and leaks the contents of adjacent inodes.\nI:H - The losing thread performs `clear_bit()` and a dirty-list insertion into freed memory plus a second `iput()`, producing a double-free and refcount underflow on an inode object that embeds `i_op`, `i_fop`, and `a_ops` function-pointer tables — a classic write/control-flow-hijack primitive, alongside on-disk metadata corruption from the double evict.\nA:H - Even unexploited, the race yields inode refcount underflow, slab double-free, list corruption, and NULL/wild-pointer dereference via `F2FS_I(NULL)->flags`, all of which oops or panic the kernel. The attacker can trigger it repeatedly from an unprivileged loop."
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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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"fs/f2fs/file.c",
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"fs/f2fs/inode.c",
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"fs/f2fs/segment.c",
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"fs/f2fs/super.c"
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],
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"versions": [
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{
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"version": "3db1de0e582c358dd013f3703cd55b5fe4076436",
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"lessThan": "102b82708c1523b36d421cb8687746906069bc17",
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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": "3db1de0e582c358dd013f3703cd55b5fe4076436",
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"lessThan": "b7724360714642099cec907f54f42e55f5325453",
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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": "3db1de0e582c358dd013f3703cd55b5fe4076436",
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"lessThan": "a46bebd502fe1a3bd1d22f64cedd93e7e7702693",
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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": "6db52f1944417c2601182a591a704e2f119c5215",
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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": "5.18.18",
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"lessThan": "5.19",
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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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{
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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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"fs/f2fs/file.c",
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"fs/f2fs/inode.c",
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"fs/f2fs/segment.c",
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"fs/f2fs/super.c"
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],
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"versions": [
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{
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"version": "5.19",
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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": "5.19",
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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": "6.1.18",
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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": "6.2.5",
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"lessThanOrEqual": "6.2.*",
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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": "6.3",
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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": "5.19",
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"versionEndExcluding": "6.1.18"
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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": "5.19",
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"versionEndExcluding": "6.2.5"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/102b82708c1523b36d421cb8687746906069bc17"
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},
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{
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"url": "https://git.kernel.org/stable/c/b7724360714642099cec907f54f42e55f5325453"
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},
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{
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"url": "https://git.kernel.org/stable/c/a46bebd502fe1a3bd1d22f64cedd93e7e7702693"
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}
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],
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"title": "f2fs: synchronize atomic write aborts",
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"x_generator": {
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