264 lines
15 KiB
JSON
264 lines
15 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-2026-43075",
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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": "2026-05-01T14:12:55.982Z",
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"datePublished": "2026-05-06T07:40:03.337Z",
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"dateUpdated": "2026-08-05T12:25:46.787Z"
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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": "2026-08-05T12:25:46.787Z"
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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\nocfs2: fix out-of-bounds write in ocfs2_write_end_inline\n\nKASAN reports a use-after-free write of 4086 bytes in\nocfs2_write_end_inline, called from ocfs2_write_end_nolock during a\ncopy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on\na loop device. The actual bug is an out-of-bounds write past the inode\nblock buffer, not a true use-after-free. The write overflows into an\nadjacent freed page, which KASAN reports as UAF.\n\nThe root cause is that ocfs2_try_to_write_inline_data trusts the on-disk\nid_count field to determine whether a write fits in inline data. On a\ncorrupted filesystem, id_count can exceed the physical maximum inline data\ncapacity, causing writes to overflow the inode block buffer.\n\nCall trace (crash path):\n\n vfs_copy_file_range (fs/read_write.c:1634)\n do_splice_direct\n splice_direct_to_actor\n iter_file_splice_write\n ocfs2_file_write_iter\n generic_perform_write\n ocfs2_write_end\n ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949)\n ocfs2_write_end_inline (fs/ocfs2/aops.c:1915)\n memcpy_from_folio <-- KASAN: write OOB\n\nSo add id_count upper bound check in ocfs2_validate_inode_block() to\nalongside the existing i_size check to fix it."
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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 vulnerable OCFS2 inline write path is reached through local VFS operations such as write/copy_file_range on an OCFS2 file, not by packets or physical device parsing directly.\nAC:L - Once a malformed inline-data inode with an excessive id_count is present, triggering the overflow is deterministic through ordinary writes and does not require winning a race or relying on conditions outside attacker control.\nPR:L - The write path itself has no OCFS2-specific privileged gate beyond normal file write permission, so a local user able to write the affected mounted file can trigger it. OCFS2 is not userns-mountable and crafting/mounting the corrupted image normally needs admin rights, but the highest reasonable shared-mounted-filesystem trigger requires only low local privileges.\nUI:N - After the affected OCFS2 filesystem is mounted, exploitation is triggered by the attacker's own file operation and does not require another user to act.\nS:U - The corruption occurs within kernel filesystem/buffer-cache memory and does not cross a separate security authority such as a guest/host or IOMMU boundary.\nC:H - This is attacker-controlled out-of-bounds kernel memory corruption, which can reasonably be leveraged into disclosure primitives rather than only a visible crash.\nI:H - The bug performs an out-of-bounds write from attacker-controlled file data past the inode block buffer, making high-integrity impact appropriate.\nA:H - The reported KASAN crash and the underlying kernel memory corruption can oops or panic the kernel, producing high availability impact."
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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/ocfs2/inode.c"
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],
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"versions": [
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{
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"version": "1afc32b952335f665327a1a9001ba1b44bb76fd9",
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"status": "affected",
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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/ocfs2/inode.c"
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],
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"versions": [
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{
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"version": "2.6.24",
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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": "2.6.24",
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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": "5.10.258",
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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": "5.15.209",
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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": "6.1.175",
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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": "6.6.136",
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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": "6.12.83",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.24",
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"lessThanOrEqual": "6.18.*",
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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": "6.19.14",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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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"references": [
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},
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},
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{
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"url": "https://git.kernel.org/stable/c/22df7d4de9c5cd42edf855a1de25f2106088c4c6"
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"url": "https://git.kernel.org/stable/c/e2c9dc6b6e96f3585f2a1062ca3374a52db0938f"
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},
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{
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"url": "https://git.kernel.org/stable/c/947f953978b0d9463498d548d0f054f5a75be2e9"
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},
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{
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"url": "https://git.kernel.org/stable/c/0c1af902223b6fcedb60904ca0b551254686c7b9"
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},
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{
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},
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{
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"url": "https://git.kernel.org/stable/c/7bc5da4842bed3252d26e742213741a4d0ac1b14"
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}
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],
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"title": "ocfs2: fix out-of-bounds write in ocfs2_write_end_inline",
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"x_generator": {
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