7.8

CVE-2024-26956: debian debian_linux

CVSS: 7.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2024-26956DEBIAN-CVE-2024-26956
Published 01-05-2024Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2024-26956 is a high (CVSS 7.8) vulnerability in debian debian_linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.1% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.26%
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 27 · Related 24
DLA-3840-1DLA-3842-1DSA-5681-1SUSE-SU-2024:1644-1SUSE-SU-2024:1659-1SUSE-SU-2024:1663-1

Timeline

  1. 01-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix failure to detect DAT corruption in btree and direct mappings Patch series "nilfs2: fix kernel bug at submit_bh_wbc()". This resolves a kernel BUG reported by syzbot. Since there are two flaws involved, I've made each one a separate patch. The first patch alone resolves the syzbot-reported bug, but I think both fixes should be sent to stable, so I've tagged them as such. This patch (of 2): Syzbot has reported a kernel bug in submit_bh_wbc() when writing file data to a nilfs2 file system whose metadata is corrupted. There are two flaws involved in this issue. The first flaw is that when nilfs_get_block() locates a data block using btree or direct mapping, if the disk address translation routine nilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata corruption, it can be passed back to nilfs_get_block(). This causes nilfs_get_block() to misidentify an existing block as non-existent, causing both data block lookup and insertion to fail inconsistently. The second flaw is that nilfs_get_block() returns a successful status in this inconsistent state. This causes the caller __block_write_begin_int() or others to request a read even though the buffer is not mapped, resulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc() failing. This fixes the first issue by changing the return value to code -EINVAL when a conversion using DAT fails with code -ENOENT, avoiding the conflicting condition that leads to the kernel bug described above. Here, code -EINVAL indicates that metadata corruption was detected during the block lookup, which will be properly handled as a file system error and converted to -EIO when passing through the nilfs2 bmap layer.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.26%

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

Ubuntu117 products
  • linuxAll versions (No fix recorded) | < 5.4.0-189.209 | < 5.15.0-116.126 | < 6.8.0-35.35
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1128.138 | < 5.15.0-1065.71 | < 6.8.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < b67189690eb4b7ecc84ae16fa1e880e0123eaa35 | ≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < 9cbe1ad5f4354f4df1445e5f4883983328cd6d8e | ≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < c3b5c5c31e723b568f83d8cafab8629d9d830ffb | ≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < 2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84 | ≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < 46b832e09d43b394ac0f6d9485d2b1a06593f0b7 | ≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < f69e81396aea66304d214f175aa371f1b5578862 | ≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713 | ≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < 82827ca21e7c8a91384c5baa656f78a5adfa4ab4 | ≥ c3a7abf06ce719a51139e62a034590be99abbc2c, < f2f26b4a84a0ef41791bd2d70861c8eac748f4ba | 2.6.31
  • linux_kernel≥ 2.6.31, < 4.19.312 | ≥ 4.20, < 5.4.274 | ≥ 5.5, < 5.10.215 | ≥ 5.11, < 5.15.154 | ≥ 5.16, < 6.1.84 | ≥ 6.2, < 6.6.24 | ≥ 6.7, < 6.7.12 | ≥ 6.8, < 6.8.3

3 vendors · 121 products

References

33 links
Show all 33 references