Description
In the Linux kernel, the following vulnerability has been resolved: procfs: fix possible double mmput() in do_procmap_query() When user provides incorrectly sized buffer for build ID for PROCMAP_QUERY we return with -ENAMETOOLONG error. After recent changes this condition happens later, after we unlocked mmap_lock/per-VMA lock and did mmput(), so original goto out is now wrong and will double-mmput() mm_struct. Fix by jumping further to clean up only vm_file and name_buf.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b9b97e6aeb534315f9646b2090d1a5024c6a4e82 to < f9fe092084cd04deea18747f58a2304026e76aaaaffectedcbc03ce3e6ce7e21214c3f02218213574c1a2d08 to < 8adaff87db143583e08eec4f4e7788f1ef8af94daffectedb5cbacd7f86f4f62b8813688c8e73be94e8e1951 to < 90f5e87c9b75833b9ef3a4415b92c0247f28ab2faffectedb5cbacd7f86f4f62b8813688c8e73be94e8e1951 to < 61dc9f776705d6db6847c101b98fa4f0e9eb6fa3affected6.12.70 to < 6.12.75affected6.18.10 to < 6.18.16affected
Linux Linux
Default version status: affected
6.19affected0 to < 6.19unaffected6.12.75 to ≤ 6.12.*unaffected6.18.16 to ≤ 6.18.*unaffected6.19.6 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa ↗
- https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d ↗
- https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f ↗
- https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3 ↗
- https://access.redhat.com/security/cve/CVE-2026-43178 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2467227 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43178.json ↗