Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: proc: protect ptrace_may_access() with exec_update_lock (part 1) Fix the easy cases where procfs currently calls ptrace_may_access() without exec_update_lock protection, where the fix is to simply add the extra lock or use mm_access(): - do_task_stat(): grab exec_update_lock - proc_pid_wchan(): grab exec_update_lock - proc_map_files_lookup(): use mm_access() instead of get_task_mm() - proc_map_files_readdir(): use mm_access() instead of get_task_mm() - proc_ns_get_link(): grab exec_update_lock - proc_ns_readlink(): grab exec_update_lock

Affected versions

Linux: f83ce3e6b02d5e48b3a43b001390e2b58820389d through before ae1e630bcaac739f625822078edbaea98366930d (git); f83ce3e6b02d5e48b3a43b001390e2b58820389d through before d54f14655fd7d7b293698a8b6918563c4c0465e7 (git); f83ce3e6b02d5e48b3a43b001390e2b58820389d through before bb43679356f1f2a4c6b1c88aec4f021e5b5c74e9 (git); f83ce3e6b02d5e48b3a43b001390e2b58820389d through before 7456ae990a9738962b33146916fabca62ae3d4e0 (git); f83ce3e6b02d5e48b3a43b001390e2b58820389d through before 4bfe8c481846cee52473a2f7d7b30ee8e6749fc4 (git); f83ce3e6b02d5e48b3a43b001390e2b58820389d through before f9b4b03ccc9c69bf7f7298d4559906ebea7143b3 (git); f83ce3e6b02d5e48b3a43b001390e2b58820389d through before c1cfd63326f5d09999134e9052c353faf738286e (git); f83ce3e6b02d5e48b3a43b001390e2b58820389d through before 6650527444dadc63d84aa939d14ecba4fadb2f69 (git); 6b06d6282100dd5aacf7d45443d651a1995bd9c4 (git); 334ed22054b2ec8477e4409e214fc139cf937ef6 (git); 2.6.27.23 through before 2.6.28 (semver); 2.6.29.3 through before 2.6.30 (semver); 2.6.30; V3.1.6 through before * (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.