Medium 5.5Published Jul 25, 2026

CVE-2026-64371proc: protect ptrace_may_access() with exec_update_lock (part 1)

Updated under an hour ago (Oct 27, 2026, 1:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f83ce3e6b02d5e48b3a43b001390e2b58820389d before ae1e630bcaac739f625822078edbaea98366930d; from f83ce3e6b02d5e48b3a43b001390e2b58820389d before d54f14655fd7d7b293698a8b6918563c4c0465e7; from f83ce3e6b02d5e48b3a43b001390e2b58820389d before bb43679356f1f2a4c6b1c88aec4f021e5b5c74e9; from f83ce3e6b02d5e48b3a43b001390e2b58820389d before 7456ae990a9738962b33146916fabca62ae3d4e0; from f83ce3e6b02d5e48b3a43b001390e2b58820389d before 4bfe8c481846cee52473a2f7d7b30ee8e6749fc4; from f83ce3e6b02d5e48b3a43b001390e2b58820389d before f9b4b03ccc9c69bf7f7298d4559906ebea7143b3; from f83ce3e6b02d5e48b3a43b001390e2b58820389d before c1cfd63326f5d09999134e9052c353faf738286e; from f83ce3e6b02d5e48b3a43b001390e2b58820389d before 6650527444dadc63d84aa939d14ecba4fadb2f69; and 4 more ranges	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.27.23 before 2.6.28; from 2.6.29.3 before 2.6.30; from 2.6.30.1 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.97; from 6.13 before 6.18.40; and 6 more ranges	NVD

References

References

https://git.kernel.org/stable/c/ae1e630bcaac739f625822078edbaea98366930d	patch
https://git.kernel.org/stable/c/d54f14655fd7d7b293698a8b6918563c4c0465e7	patch
https://git.kernel.org/stable/c/bb43679356f1f2a4c6b1c88aec4f021e5b5c74e9	patch
https://git.kernel.org/stable/c/7456ae990a9738962b33146916fabca62ae3d4e0	patch
https://git.kernel.org/stable/c/4bfe8c481846cee52473a2f7d7b30ee8e6749fc4	patch
https://git.kernel.org/stable/c/f9b4b03ccc9c69bf7f7298d4559906ebea7143b3	patch
https://git.kernel.org/stable/c/c1cfd63326f5d09999134e9052c353faf738286e	patch
https://git.kernel.org/stable/c/6650527444dadc63d84aa939d14ecba4fadb2f69	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html	third-party-advisory
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.