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CVE-2024-49958ocfs2: reserve space for inline xattr before attaching reflink tree

Description

In 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.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 22 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-49958, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.27% · top 80% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

  • Linux · Linux

    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < 5c9807c523b4fca81d3e8e864dabc8c806402121
    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < 74364cb578dcc0b6c9109519d19cbe5a56afac9a
    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < aac31d654a0a31cb0d2fa36ae694f4e164a52707
    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < 020f5c53c17f66c0a8f2d37dad27ace301b8d8a1
    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < 5c2072f02c0d75802ec28ec703b7d43a0dd008b5
    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < 637c00e06564a945e9d0edb3d78d362d64935f9f
    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < 9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9
    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < 96ce4c3537114d1698be635f5e36c62dc49df7a4
    • affected ef962df057aaafd714f5c22ba3de1be459571fdf – < 5ca60b86f57a4d9648f68418a725b3a7de2816b0
    • affected 3a32958d2ac96070c53d04bd8e013c97b260b5e6
    • affected 93f26306db89c9dc37885b76a1082e6d54d23b16
    • affected 26a849f49fb3347d126a0ed6611173f903374ef4
    • affected 1e7e4c9ae2a78a6791a2ca91a6a400f94855f01e
    • affected 1926bf8ae44d80c9f50103f11fc4f17e2e2bf684
    • affected 3.0.87 – < 3.1
    • affected 3.2.49 – < 3.3
    • affected 3.4.54 – < 3.5
    • affected 3.9.11 – < 3.10
    • affected 3.10.2 – < 3.11

  • Linux · Linux

    • affected 3.11
    • unaffected < 3.11
    • unaffected 4.19.323 – ≤ 4.19.*
    • unaffected 5.4.285 – ≤ 5.4.*
    • unaffected 5.10.227 – ≤ 5.10.*
    • unaffected 5.15.168 – ≤ 5.15.*
    • unaffected 6.1.113 – ≤ 6.1.*
    • unaffected 6.6.55 – ≤ 6.6.*
    • unaffected 6.10.14 – ≤ 6.10.*
    • unaffected 6.11.3 – ≤ 6.11.*
    • unaffected 6.12 – ≤ *

References

References11

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .