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CVE-2026-64375— proc: protect ptrace_may_access() with exec_update_lock (FD links)

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 2.6.18版本存在安全漏洞，该漏洞源于proc文件系统中的proc_pid_get_link()和proc_pid_readlink()函数存在竞争条件，可能导致攻击者绕过ptrace访问检查。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1053 · Scheduled Task/Job

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 778c1144771f0064b6f51bee865cceb0d996f2f9< 6253dfee5afba536bb54fc6fe6c091c3758fafe1 affected
778c1144771f0064b6f51bee865cceb0d996f2f9< 65bf0d2b6e914f1448d6a2fde193dcf60936a651 affected
778c1144771f0064b6f51bee865cceb0d996f2f9< de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf affected
778c1144771f0064b6f51bee865cceb0d996f2f9< 138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2 affected
778c1144771f0064b6f51bee865cceb0d996f2f9< 83b17872e3166c295c599279fc9562ac3840c638 affected
778c1144771f0064b6f51bee865cceb0d996f2f9< 497c6bae5167428596575f20af6613ff5671f383 affected
778c1144771f0064b6f51bee865cceb0d996f2f9< dfd1894cb64cbd8758b461ed713800fe73db4f82 affected
778c1144771f0064b6f51bee865cceb0d996f2f9< 6255da28d4bb5349fe18e84cb043ccd394eba75d affected
… +10 more rows
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I. Basic Information for CVE-2026-64375

Vulnerability Information
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Vulnerability Title
proc: protect ptrace_may_access() with exec_update_lock (FD links)
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 (FD links) proc_pid_get_link() and proc_pid_readlink() currently look up the task from the pid once, then do the ptrace access check on that task, then look up the task from the pid a second time to do the actual access. That's racy in several ways. To fix it, pass the task to the ->proc_get_link() handler, and instead of proc_fd_access_allowed(), introduce a new helper call_proc_get_link() that looks up and locks the task, does the access check, and calls ->proc_get_link().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 2.6.18版本存在安全漏洞，该漏洞源于proc文件系统中的proc_pid_get_link()和proc_pid_readlink()函数存在竞争条件，可能导致攻击者绕过ptrace访问检查。
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 778c1144771f0064b6f51bee865cceb0d996f2f9 ~ 6253dfee5afba536bb54fc6fe6c091c3758fafe1 -
Linux Linux 2.6.18 -

II. Public POCs for CVE-2026-64375

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III. Intelligence Information for CVE-2026-64375

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Patches & Fixes for CVE-2026-64375 (7)

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

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64410 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-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
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-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64450 9.1 CRITICAL tipc: fix out-of-bounds read in broadcast Gap ACK blocks

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-2026-64375

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