Bug 2507148 (CVE-2026-64371)

Summary: CVE-2026-64371 kernel: proc: protect ptrace_may_access() with exec_update_lock (part 1)
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's `procfs` (a virtual filesystem that provides information about running processes). This vulnerability occurs because certain functions within `procfs` do not properly protect access to process memory information. A local attacker could exploit this missing protection to potentially disclose sensitive information about other processes, which could lead to further system compromise.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-07-25 10:07:34 UTC 
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
Comment 1 Mauro Matteo Cascella 2026-08-02 13:39:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072523-CVE-2026-64371-d1c5@gregkh/T