7.8

CVE-2024-49958: linux

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2024-49958DEBIAN-CVE-2024-49958
Published 21-10-2024Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2024-49958 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 55 · Related 53
DLA-4008-1DLA-4075-1MGASA-2024-0344MGASA-2024-0345OPENSUSE-SU-2024:14500-1OPENSUSE-SU-2025:14705-1

Timeline

  1. 21-10-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

0.00 pp

From 0.27% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.27%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu134 products
  • linuxAll versions (No fix recorded) | < 4.4.0-270.304 | < 4.15.0-239.251 | < 5.4.0-208.228 | < 5.15.0-127.137 | < 6.8.0-54.56
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1145.151 | < 4.4.0-1183.198 | < 4.15.0-1182.195 | < 5.4.0-1140.150 | < 5.15.0-1073.79 | < 6.8.0-1023.25
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < 5c9807c523b4fca81d3e8e864dabc8c806402121 | ≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < 74364cb578dcc0b6c9109519d19cbe5a56afac9a | ≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < aac31d654a0a31cb0d2fa36ae694f4e164a52707 | ≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < 020f5c53c17f66c0a8f2d37dad27ace301b8d8a1 | ≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < 5c2072f02c0d75802ec28ec703b7d43a0dd008b5 | ≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < 637c00e06564a945e9d0edb3d78d362d64935f9f | ≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < 9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9 | ≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < 96ce4c3537114d1698be635f5e36c62dc49df7a4 | ≥ ef962df057aaafd714f5c22ba3de1be459571fdf, < 5ca60b86f57a4d9648f68418a725b3a7de2816b0 | 3a32958d2ac96070c53d04bd8e013c97b260b5e6 | 93f26306db89c9dc37885b76a1082e6d54d23b16 | 26a849f49fb3347d126a0ed6611173f903374ef4 | 1e7e4c9ae2a78a6791a2ca91a6a400f94855f01e | 1926bf8ae44d80c9f50103f11fc4f17e2e2bf684 | ≥ 3.0.87, < 3.1 | ≥ 3.2.49, < 3.3 | ≥ 3.4.54, < 3.5 | ≥ 3.9.11, < 3.10 | ≥ 3.10.2, < 3.11 | 3.11
  • linux_kernel≥ 3.0.87, < 3.2 | ≥ 3.2.49, < 3.4 | ≥ 3.4.54, < 3.9 | ≥ 3.9.11, < 3.10 | ≥ 3.10.2, < 3.11 | ≥ 3.11, < 5.10.227 | ≥ 5.11, < 5.15.168 | ≥ 5.16, < 6.1.113 | ≥ 6.2, < 6.6.55 | ≥ 6.7, < 6.10.14 | ≥ 6.11, < 6.11.3
Debian1 product
  • linux< 6.1.115-1 | < 6.11.4-1

3 vendors · 137 products

References

54 links
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