CVE-2026-46078

erofs: fix the out-of-bounds nameoff handling for trailing dirents

State: Published
Severity: 7.1 High
Published: May 27, 2026
Updated: Oct 19, 2026
Reserved: May 13, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

erofs: fix the out-of-bounds nameoff handling for trailing dirents

Currently we already have boundary-checks for nameoffs, but the trailing dirents are special since the namelens are calculated with strnlen() with unchecked nameoffs.

If a crafted EROFS has a trailing dirent with nameoff >= maxsize, maxsize - nameoff can underflow, causing strnlen() to read past the directory block.

nameoff0 should also be verified to be a multiple of `sizeof(struct erofs_dirent)` as well [1].

[1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H	Linux

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
LinuxLinux	3aa8ec716e52c02360457fa018296629b4d0becf to before a8ee527807f7d97e55ce2ef2906f7f34975eb1c7Affected 3aa8ec716e52c02360457fa018296629b4d0becf to before aa16dca1b062355181ef215229eeac249d7c0d61Affected 3aa8ec716e52c02360457fa018296629b4d0becf to before 80a23c6d1aba35be8746d74ac14e6ba5ae46da21Affected 3aa8ec716e52c02360457fa018296629b4d0becf to before 222055e6b4063abd2d9e13c3d49bbd1724c50789Affected 3aa8ec716e52c02360457fa018296629b4d0becf to before 48b27a955d22391c7f30169fa7b6b2e1977f1ce4Affected 3aa8ec716e52c02360457fa018296629b4d0becf to before 8ebb951a284b7446e025afc7dc5e9516ef9a7214Affected 3aa8ec716e52c02360457fa018296629b4d0becf to before 1d55445226c75ddd4e78b09b3e7d99109b28c366Affected 3aa8ec716e52c02360457fa018296629b4d0becf to before d18a3b5d337fa412a38e776e6b4b857a58836575Affected
LinuxLinux	4.19Affected before 4.19Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.140 through 6.6.Not affected 6.12.86 through 6.12.Not affected 6.18.27 through 6.18.Not affected 7.0.4 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

3aa8ec716e52c02360457fa018296629b4d0becf to before a8ee527807f7d97e55ce2ef2906f7f34975eb1c7Affected
3aa8ec716e52c02360457fa018296629b4d0becf to before aa16dca1b062355181ef215229eeac249d7c0d61Affected
3aa8ec716e52c02360457fa018296629b4d0becf to before 80a23c6d1aba35be8746d74ac14e6ba5ae46da21Affected
3aa8ec716e52c02360457fa018296629b4d0becf to before 222055e6b4063abd2d9e13c3d49bbd1724c50789Affected
3aa8ec716e52c02360457fa018296629b4d0becf to before 48b27a955d22391c7f30169fa7b6b2e1977f1ce4Affected
3aa8ec716e52c02360457fa018296629b4d0becf to before 8ebb951a284b7446e025afc7dc5e9516ef9a7214Affected
3aa8ec716e52c02360457fa018296629b4d0becf to before 1d55445226c75ddd4e78b09b3e7d99109b28c366Affected
3aa8ec716e52c02360457fa018296629b4d0becf to before d18a3b5d337fa412a38e776e6b4b857a58836575Affected

LinuxLinux

4.19Affected
before 4.19Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.140 through 6.6.*Not affected
6.12.86 through 6.12.*Not affected
6.18.27 through 6.18.*Not affected
7.0.4 through 7.0.*Not affected
7.1 and laterNot affected

References

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