CVE-2026-43178

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxb9b97e6aeb534315f9646b2090d1a5024c6a4e82 < f9fe092084cd04deea18747f58a2304026e76aaaaffected
LinuxLinuxcbc03ce3e6ce7e21214c3f02218213574c1a2d08 < 8adaff87db143583e08eec4f4e7788f1ef8af94daffected
LinuxLinuxb5cbacd7f86f4f62b8813688c8e73be94e8e1951 < 90f5e87c9b75833b9ef3a4415b92c0247f28ab2faffected
LinuxLinuxb5cbacd7f86f4f62b8813688c8e73be94e8e1951 < 61dc9f776705d6db6847c101b98fa4f0e9eb6fa3affected
LinuxLinux6.12.70 < 6.12.75affected
LinuxLinux6.18.10 < 6.18.16affected
LinuxLinux6.19affected
LinuxLinux0 < 6.19unaffected
LinuxLinux6.12.75 <= 6.12.*unaffected
LinuxLinux6.18.16 <= 6.18.*unaffected
LinuxLinux6.19.6 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

ADP Enrichment

kernel: procfs: fix possible double mmput() in do_procmap_query()

Additional References

References