CVE-2026-31694

Advisory lineage Upstream: 0 Downstream: 5
Modified
Published: 01 May 2026, 13:53
Last modified:01 Jun 2026, 16:13

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

01 May 2026, 13:53
Published
Vulnerability first disclosed
01 Jun 2026, 16:13
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page cache fuse_add_dirent_to_cache() computes a serialized dirent size from the server-controlled namelen field and copies the dirent into a single page-cache page. The existing logic only checks whether the dirent fits in the remaining space of the current page and advances to a fresh page if not. It never checks whether the dirent itself exceeds PAGE_SIZE. As a result, a malicious FUSE server can return a dirent with namelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB page systems this causes memcpy() to overflow the cache page by 24 bytes into the following kernel page. Reject dirents that cannot fit in a single page before copying them into the readdir cache.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 4%

Affected Systems

  • linux•linux

    ≥ 69e34551152a286f827d54dcb5700da6aeaac1fb, < 3059f9abe7f1ba8fddf3c86c5faa1eeacf07e7d4 | ≥ 69e34551152a286f827d54dcb5700da6aeaac1fb, < 1d4a517fa90480c52fd452fea2686cd80f773ce2 | ≥ 69e34551152a286f827d54dcb5700da6aeaac1fb, < 038e61812fa52ef62bad2cfc96bf37dc0db47c1e | ≥ 69e34551152a286f827d54dcb5700da6aeaac1fb, < d23ad78bfd205eac26766e38ba7d79f279131098 | ≥ 69e34551152a286f827d54dcb5700da6aeaac1fb, < 45c05af36311624c1148123caeb011312495d86b | ≥ 69e34551152a286f827d54dcb5700da6aeaac1fb, < 7de93abfaae1b2dc94da8a07a36421bd073f1d8f | ≥ 69e34551152a286f827d54dcb5700da6aeaac1fb, < 474ce83c96a55f2eeb14dee2be375eeadfdacdf5 | ≥ 69e34551152a286f827d54dcb5700da6aeaac1fb, < 51a8de6c50bf947c8f534cd73da4c8f0a13e7bed | 4.20

  • linux•linux_kernel

    ≥ 4.20, < 6.6.136 | ≥ 6.7, < 6.12.84 | ≥ 6.13, < 6.18.25 | ≥ 6.19, < 7.0.2 | 7.1:rc1 | 7.1:rc2

References (8)