184 lines
11 KiB
JSON
184 lines
11 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-2026-90321",
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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": "2026-09-11T19:38:34.802Z",
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"datePublished": "2026-09-17T16:08:38.138Z",
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"dateUpdated": "2026-10-21T12:50:56.779Z"
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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": "2026-10-21T12:50:56.779Z"
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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: validate inline xattrs during inode block validation\n\nPatch series \"ocfs2: validate xattr entry bounds\", v7.\n\nThis series validates OCFS2 xattr entry name/value bounds when xattr\nmetadata is read and validated, before getxattr() or listxattr() can walk\nout-of-range entry arrays or offsets from corrupted metadata.\n\n\nThis patch (of 2):\n\nocfs2_validate_inode_block() verifies a dinode before OCFS2 users walk\nmetadata from it, but inline xattr metadata is still checked only in\noperation-specific consumers. The existing ibody lookup helper validates\ninline header placement and entry count, but inode block validation does\nnot reject entry name/value bounds.\n\nAdd a flat xattr entry validator and call it from inode block validation\nfor inline xattrs. Keep the operation paths on their existing\nheader/count lookup checks; the full entry bounds check now runs when the\ninode block is validated at read time.\n\nReject corrupted inline xattr metadata before ocfs2_xattr_ibody_get() or\nlistxattr() can walk past the inline storage.\n\nValidation reproduced this kernel report:\nBUG: KASAN: use-after-free in ocfs2_xattr_find_entry+0x5a/0x170\nRead of size 2 at addr ffff8881242a2000 by task python3/529\nCall Trace:\n dump_stack_lvl+0x66/0xa0\n print_report+0xce/0x630\n kasan_report+0xe0/0x110\n ocfs2_xattr_find_entry+0x5a/0x170\n ocfs2_xattr_get_nolock+0x20a/0x820\n ocfs2_xattr_get+0x10c/0x1e0\n __vfs_getxattr+0xe2/0x130\n vfs_getxattr+0x185/0x1b0"
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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:N/UI:R/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 malformed bytes are dinode inline-xattr xe_name_offset, xe_name_len and xe_value_size, read from the inode block by ocfs2_read_inode_block() into ocfs2_validate_inode_block() and later walked by ocfs2_xattr_ibody_get()/ocfs2_xattr_ibody_list(); no o2net, NFS, or SMB message carries those offsets.\nAC:L - A crafted dinode with OCFS2_INLINE_XATTR_FL and attacker-chosen xe_name_offset/xe_value_size is sufficient; after mount, getxattr(2) reaches vfs_getxattr()→ocfs2_xattr_get()→ocfs2_xattr_find_entry() and hits the reported KASAN UAF with no race or other condition outside the attacker’s control.\nPR:N - ocfs2_fs_type.fs_flags has no FS_USERNS_MOUNT, so the attacker cannot self-mount; ocfs2_xa_set() writes well-formed inline entries, so planting a bad xe_name_offset needs a crafted image. After the victim’s ocfs2_fill_super(), listxattr(2) calls ocfs2_listxattr() with no MAY_READ/DAC check.\nUI:R - The inline xattr payload is inert until a victim mounts the crafted OCFS2 image through ocfs2_fill_super(); getxattr(2) or listxattr(2) on that volume is the follow-on action that reaches ocfs2_xattr_find_entry() or ocfs2_xattr_list_entries().\nS:U - The OOB/UAF is in the dinode buffer_head parsed by ocfs2_validate_inode_block() on the same host that mounted the volume and does not cross a VM, IOMMU, or guest-to-host boundary.\nC:H - ocfs2_xattr_list_entries() memcpy’s xe_name_len bytes from header+xe_name_offset into the listxattr buffer, and ocfs2_xattr_ibody_get() memcpy’s xe_value_size bytes from that same unvalidated offset into the getxattr buffer; the repro is a KASAN UAF read of size 2 in ocfs2_xattr_find_entry().\nI:H - The same unvalidated xe_name_offset/xe_value_size are a kernel UAF/OOB walk of the inline region; ocfs2_xa_block_wipe_namevalue() memmove’s from header+min(xe_name_offset) with namevalue_size_xe() taken from on-disk xe_value_size when setxattr reuses that entry, a heap write primitive.\nA:H - The KASAN report is a use-after-free in ocfs2_xattr_find_entry() from getxattr; namevalue_size_xe() BUG_ON()s when a local inline entry has xe_value_size > OCFS2_XATTR_INLINE_SIZE, and walking an out-of-range name/value offset can oops the node."
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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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"fs/ocfs2/xattr.c",
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"fs/ocfs2/xattr.h"
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],
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"version": "cf1d6c763fbcb115263114302485ad17e7933d87",
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"lessThan": "7dec19f6bafe4e1503007141c9f5eb7eb10e5578",
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"status": "affected",
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"product": "Linux",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"fs/ocfs2/inode.c",
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"fs/ocfs2/xattr.c",
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"fs/ocfs2/xattr.h"
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],
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{
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"status": "affected"
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},
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{
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"version": "0",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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},
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"version": "6.12.114",
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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": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7dec19f6bafe4e1503007141c9f5eb7eb10e5578"
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"url": "https://git.kernel.org/stable/c/8914a3330b72378136c2c02d6328a826f6abdad7"
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}
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