CVE-2026-46078

Summary

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3aa8ec716e52c02360457fa018296629b4d0becf < a8ee527807f7d97e55ce2ef2906f7f34975eb1c7affected
LinuxLinux3aa8ec716e52c02360457fa018296629b4d0becf < aa16dca1b062355181ef215229eeac249d7c0d61affected
LinuxLinux3aa8ec716e52c02360457fa018296629b4d0becf < 80a23c6d1aba35be8746d74ac14e6ba5ae46da21affected
LinuxLinux3aa8ec716e52c02360457fa018296629b4d0becf < 222055e6b4063abd2d9e13c3d49bbd1724c50789affected
LinuxLinux3aa8ec716e52c02360457fa018296629b4d0becf < 48b27a955d22391c7f30169fa7b6b2e1977f1ce4affected
LinuxLinux3aa8ec716e52c02360457fa018296629b4d0becf < 8ebb951a284b7446e025afc7dc5e9516ef9a7214affected
LinuxLinux3aa8ec716e52c02360457fa018296629b4d0becf < 1d55445226c75ddd4e78b09b3e7d99109b28c366affected
LinuxLinux3aa8ec716e52c02360457fa018296629b4d0becf < d18a3b5d337fa412a38e776e6b4b857a58836575affected
LinuxLinux4.19affected
LinuxLinux0 < 4.19unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.86 <= 6.12.*unaffected
LinuxLinux6.18.27 <= 6.18.*unaffected
LinuxLinux7.0.4 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References