procfs: fix possible double mmput() in do_procmap_query()
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.1%
exploitation probability
0.1%top 97% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://access.redhat.com/security/cve/CVE-2026-43178https://bugzilla.redhat.com/show_bug.cgi?id=2467227https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94dhttps://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2fhttps://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaahttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43178.json