ocfs2: reserve space for inline xattr before attaching reflink tree

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-49958
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-21 18:15:17 UTC
Updated2026-08-04 11:21:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ocfs2: reserve space for inline xattr before attaching reflink tree One of our customers reported a crash and a corrupted ocfs2 filesystem. The crash was due to the detection of corruption. Upon troubleshooting, the fsck -fn output showed the below corruption [EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record, but fsck believes the largest valid value is 227. Clamp the next record value? n The stat output from the debugfs.ocfs2 showed the following corruption where the "Next Free Rec:" had overshot the "Count:" in the root metadata block. Inode: 33080590 Mode: 0640 Generation: 2619713622 (0x9c25a856) FS Generation: 904309833 (0x35e6ac49) CRC32: 00000000 ECC: 0000 Type: Regular Attr: 0x0 Flags: Valid Dynamic Features: (0x16) HasXattr InlineXattr Refcounted Extended Attributes Block: 0 Extended Attributes Inline Size: 256 User: 0 (root) Group: 0 (root) Size: 281320357888 Links: 1 Clusters: 141738 ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024 atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024 mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024 dtime: 0x0 -- Wed Dec 31 17:00:00 1969 Refcount Block: 2777346 Last Extblk: 2886943 Orphan Slot: 0 Sub Alloc Slot: 0 Sub Alloc Bit: 14 Tree Depth: 1 Count: 227 Next Free Rec: 230 ## Offset Clusters Block# 0 0 2310 2776351 1 2310 2139 2777375 2 4449 1221 2778399 3 5670 731 2779423 4 6401 566 2780447 ....... .... ....... ....... .... ....... The issue was in the reflink workfow while reserving space for inline xattr. The problematic function is ocfs2_reflink_xattr_inline(). By the time this function is called the reflink tree is already recreated at the destination inode from the source inode. At this point, this function reserves space for inline xattrs at the destination inode without even checking if there is space at the root metadata block. It simply reduces the l_count from 243 to 227 thereby making space of 256 bytes for inline xattr whereas the inode already has extents beyond this index (in this case up to 230), thereby causing corruption. The fix for this is to reserve space for inline metadata at the destination inode before the reflink tree gets recreated. The customer has verified the fix.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf 5c9807c523b4fca81d3e8e864dabc8c806402121 git Not specified
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf 74364cb578dcc0b6c9109519d19cbe5a56afac9a git Not specified
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf aac31d654a0a31cb0d2fa36ae694f4e164a52707 git Not specified
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf 020f5c53c17f66c0a8f2d37dad27ace301b8d8a1 git Not specified
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf 5c2072f02c0d75802ec28ec703b7d43a0dd008b5 git Not specified
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf 637c00e06564a945e9d0edb3d78d362d64935f9f git Not specified
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf 9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9 git Not specified
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf 96ce4c3537114d1698be635f5e36c62dc49df7a4 git Not specified
CNA Linux Linux affected ef962df057aaafd714f5c22ba3de1be459571fdf 5ca60b86f57a4d9648f68418a725b3a7de2816b0 git Not specified
CNA Linux Linux affected 3a32958d2ac96070c53d04bd8e013c97b260b5e6 git Not specified
CNA Linux Linux affected 93f26306db89c9dc37885b76a1082e6d54d23b16 git Not specified
CNA Linux Linux affected 26a849f49fb3347d126a0ed6611173f903374ef4 git Not specified
CNA Linux Linux affected 1e7e4c9ae2a78a6791a2ca91a6a400f94855f01e git Not specified
CNA Linux Linux affected 1926bf8ae44d80c9f50103f11fc4f17e2e2bf684 git Not specified
CNA Linux Linux affected 3.0.87 3.1 semver Not specified
CNA Linux Linux affected 3.2.49 3.3 semver Not specified
CNA Linux Linux affected 3.4.54 3.5 semver Not specified
CNA Linux Linux affected 3.9.11 3.10 semver Not specified
CNA Linux Linux affected 3.10.2 3.11 semver Not specified
CNA Linux Linux affected 3.11 Not specified
CNA Linux Linux unaffected 3.11 semver Not specified
CNA Linux Linux unaffected 4.19.323 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.285 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.227 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.168 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.113 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.55 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.14 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11.3 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/74364cb578dcc0b6c9109519d19cbe5a56afac9a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/637c00e06564a945e9d0edb3d78d362d64935f9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5c9807c523b4fca81d3e8e864dabc8c806402121 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aac31d654a0a31cb0d2fa36ae694f4e164a52707 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5ca60b86f57a4d9648f68418a725b3a7de2816b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/96ce4c3537114d1698be635f5e36c62dc49df7a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5c2072f02c0d75802ec28ec703b7d43a0dd008b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/020f5c53c17f66c0a8f2d37dad27ace301b8d8a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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