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CVE-2026-64375

HIGHCVSS 7.8/10EPSS 0.13%

Last modified

CVE-2026-64375 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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().. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

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().

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.13%

2.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 778c1144771f0064b6f51bee865cceb0d996f2f9, < 6253dfee5afba536bb54fc6fe6c091c3758fafe1; >= 778c1144771f0064b6f51bee865cceb0d996f2f9, < 65bf0d2b6e914f1448d6a2fde193dcf60936a651; >= 778c1144771f0064b6f51bee865cceb0d996f2f9, < de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf; >= 778c1144771f0064b6f51bee865cceb0d996f2f9, < 138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2; >= 778c1144771f0064b6f51bee865cceb0d996f2f9, < 83b17872e3166c295c599279fc9562ac3840c638; >= 778c1144771f0064b6f51bee865cceb0d996f2f9, < 497c6bae5167428596575f20af6613ff5671f383; >= 778c1144771f0064b6f51bee865cceb0d996f2f9, < dfd1894cb64cbd8758b461ed713800fe73db4f82; >= 778c1144771f0064b6f51bee865cceb0d996f2f9, < 6255da28d4bb5349fe18e84cb043ccd394eba75d
LinuxLinux2.6.18

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64375?
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().
How severe is CVE-2026-64375?
CVE-2026-64375 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64375?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST