CVE-2026-52906: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: 9p: fix access mode flags being ORed instead of replaced Since commit 1f3e4142c0eb ("9p: convert to the new mount API"), v9fs_apply_options() applies parsed mount flags with |= onto flags already set by v9fs_session_init(). For 9P2000.L, session_init sets V9FS_ACCESS_CLIENT as the default, so when the user mounts with "access=user", both bits end up set. Access mode checks compare against exact values, so having both bits set matches neither mode. This causes v9fs_fid_lookup() to fall through to the default switch case, using INVALID_UID (nobody/65534) instead of current_fsuid() for all fid lookups. Root is then unable to chown or perform other privileged operations. Fix by clearing the access mask before applying the user's choice.

Засегнати продукти

• Linux Linux: 1f3e4142c0eb178089ea0cbc97506a061470ad27 преди b8f037e87a083291190204b959cda417aaf01058; 1f3e4142c0eb178089ea0cbc97506a061470ad27 преди da2346a48a5a1fed86c3fe3d73c0b60e7b3027c9
• Linux Linux: 6.19; преди 6.19; 7.0.4 до 7.0.*; от 7.1 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-52906
• https://nvd.nist.gov/vuln/detail/CVE-2026-52906
• https://git.kernel.org/stable/c/b8f037e87a083291190204b959cda417aaf01058
• https://git.kernel.org/stable/c/da2346a48a5a1fed86c3fe3d73c0b60e7b3027c9