CVE-2026-43178 PUBLISHED

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

Assigner: Linux
Reserved: 01.05.2026 Published: 06.05.2026 Updated: 06.05.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from b9b97e6aeb534315f9646b2090d1a5024c6a4e82 to f9fe092084cd04deea18747f58a2304026e76aaa (excl.)
  • affected from cbc03ce3e6ce7e21214c3f02218213574c1a2d08 to 8adaff87db143583e08eec4f4e7788f1ef8af94d (excl.)
  • affected from b5cbacd7f86f4f62b8813688c8e73be94e8e1951 to 90f5e87c9b75833b9ef3a4415b92c0247f28ab2f (excl.)
  • affected from b5cbacd7f86f4f62b8813688c8e73be94e8e1951 to 61dc9f776705d6db6847c101b98fa4f0e9eb6fa3 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.19 is affected
  • unaffected from 0 to 6.19 (excl.)
  • unaffected from 6.12.75 to 6.12.* (incl.)
  • unaffected from 6.18.16 to 6.18.* (incl.)
  • unaffected from 6.19.6 to 6.19.* (incl.)
  • unaffected from 7.0 to * (incl.)

References