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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于procfs调用ptrace_may_access()时缺少exec_update_lock保护，可能导致攻击者获取敏感信息或执行未授权操作。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1055.008 · Ptrace System Calls

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux f83ce3e6b02d5e48b3a43b001390e2b58820389d< ae1e630bcaac739f625822078edbaea98366930d affected
f83ce3e6b02d5e48b3a43b001390e2b58820389d< d54f14655fd7d7b293698a8b6918563c4c0465e7 affected
f83ce3e6b02d5e48b3a43b001390e2b58820389d< bb43679356f1f2a4c6b1c88aec4f021e5b5c74e9 affected
f83ce3e6b02d5e48b3a43b001390e2b58820389d< 7456ae990a9738962b33146916fabca62ae3d4e0 affected
f83ce3e6b02d5e48b3a43b001390e2b58820389d< 4bfe8c481846cee52473a2f7d7b30ee8e6749fc4 affected
f83ce3e6b02d5e48b3a43b001390e2b58820389d< f9b4b03ccc9c69bf7f7298d4559906ebea7143b3 affected
f83ce3e6b02d5e48b3a43b001390e2b58820389d< c1cfd63326f5d09999134e9052c353faf738286e affected
f83ce3e6b02d5e48b3a43b001390e2b58820389d< 6650527444dadc63d84aa939d14ecba4fadb2f69 affected
… +14 more rows
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I. Basic Information for CVE-2026-64371

Vulnerability Information
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Vulnerability Title
proc: protect ptrace_may_access() with exec_update_lock (part 1)
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于procfs调用ptrace_may_access()时缺少exec_update_lock保护，可能导致攻击者获取敏感信息或执行未授权操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f83ce3e6b02d5e48b3a43b001390e2b58820389d ~ ae1e630bcaac739f625822078edbaea98366930d -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-64371

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III. Intelligence Information for CVE-2026-64371

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Patches & Fixes for CVE-2026-64371 (7)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64371

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