CVE-2026-64375 (GCVE-0-2026-64375)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-10-19 20:38
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 778c1144771f0064b6f51bee865cceb0d996f2f9
Version: 778c1144771f0064b6f51bee865cceb0d996f2f9
Version: 778c1144771f0064b6f51bee865cceb0d996f2f9
Version: 778c1144771f0064b6f51bee865cceb0d996f2f9
Version: 778c1144771f0064b6f51bee865cceb0d996f2f9
Version: 778c1144771f0064b6f51bee865cceb0d996f2f9
Version: 778c1144771f0064b6f51bee865cceb0d996f2f9
Version: 778c1144771f0064b6f51bee865cceb0d996f2f9
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setuid target process and race concurrent procfs accesses repeatedly, thereby controlling both sides of the race.\\nPR:L - A basic unprivileged user can pass the initial ptrace check against a same-UID dumpable child before it performs privileged exec; no capability is required.\\nUI:N - The attacker can create and race the target by launching the setuid program directly, without action from another user.\\nS:U - The procfs authorization bypass compromises privileged resources on the same host and constitutes ordinary local privilege escalation rather than crossing a VM or hardware isolation boundary.\\nC:H - The race can redirect an authorized pre-exec lookup to a private post-setuid memfd whose permissive shmem inode allows the attacker to read all privileged contents, including secrets.\\nI:H - The attacker can obtain write and truncation access to the privileged memfd; corruption of trusted data or executable content consumed by the setuid process can yield root-level code execution.\\nA:H - Tampering with a privileged process\u0027s trusted memfd can crash or disable critical privileged services, and resulting root-level execution permits complete system availability loss.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"778c1144771f0064b6f51bee865cceb0d996f2f9\", \"lessThan\": \"6253dfee5afba536bb54fc6fe6c091c3758fafe1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"778c1144771f0064b6f51bee865cceb0d996f2f9\", \"lessThan\": \"65bf0d2b6e914f1448d6a2fde193dcf60936a651\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"778c1144771f0064b6f51bee865cceb0d996f2f9\", \"lessThan\": \"de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"778c1144771f0064b6f51bee865cceb0d996f2f9\", \"lessThan\": \"138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"778c1144771f0064b6f51bee865cceb0d996f2f9\", \"lessThan\": \"83b17872e3166c295c599279fc9562ac3840c638\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"778c1144771f0064b6f51bee865cceb0d996f2f9\", \"lessThan\": \"497c6bae5167428596575f20af6613ff5671f383\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"778c1144771f0064b6f51bee865cceb0d996f2f9\", \"lessThan\": \"dfd1894cb64cbd8758b461ed713800fe73db4f82\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"778c1144771f0064b6f51bee865cceb0d996f2f9\", \"lessThan\": \"6255da28d4bb5349fe18e84cb043ccd394eba75d\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/proc/base.c\", \"fs/proc/fd.c\", \"fs/proc/internal.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/proc/base.c\", \"fs/proc/fd.c\", \"fs/proc/internal.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1\"}, {\"url\": \"https://git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651\"}, {\"url\": \"https://git.kernel.org/stable/c/de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf\"}, {\"url\": \"https://git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2\"}, {\"url\": \"https://git.kernel.org/stable/c/83b17872e3166c295c599279fc9562ac3840c638\"}, {\"url\": \"https://git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383\"}, {\"url\": \"https://git.kernel.org/stable/c/dfd1894cb64cbd8758b461ed713800fe73db4f82\"}, {\"url\": \"https://git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nproc: protect ptrace_may_access() with exec_update_lock (FD links)\\n\\nproc_pid_get_link() and proc_pid_readlink() currently look up the task from\\nthe pid once, then do the ptrace access check on that task, then look up\\nthe task from the pid a second time to do the actual access.\\nThat\u0027s racy in several ways.\\n\\nTo fix it, pass the task to the -\u003eproc_get_link() handler, and instead of\\nproc_fd_access_allowed(), introduce a new helper call_proc_get_link() that\\nlooks up and locks the task, does the access check, and calls\\n-\u003eproc_get_link().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:54:26.202Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64375\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:25.420Z\", \"dateReserved\": \"2026-07-19T15:36:31.784Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:50:26.869Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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