{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64375", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.784Z", "datePublished": "2026-07-25T08:50:26.869Z", "dateUpdated": "2026-08-17T04:54:26.202Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:54:26.202Z" }, "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's racy in several ways.\n\nTo fix it, pass the task to the ->proc_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->proc_get_link()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation uses local open/openat or readlink syscalls against /proc/$pid symlinks; no network or physical access path reaches the flaw.\nAC:L - The attacker can launch the 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's trusted memfd can crash or disable critical privileged services, and resulting root-level execution permits complete system availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/proc/base.c", "fs/proc/fd.c", "fs/proc/internal.h" ], "versions": [ { "version": "778c1144771f0064b6f51bee865cceb0d996f2f9", "lessThan": "6253dfee5afba536bb54fc6fe6c091c3758fafe1", "status": "affected", "versionType": "git" }, { "version": "778c1144771f0064b6f51bee865cceb0d996f2f9", "lessThan": "65bf0d2b6e914f1448d6a2fde193dcf60936a651", "status": "affected", "versionType": "git" }, { "version": "778c1144771f0064b6f51bee865cceb0d996f2f9", "lessThan": "de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf", "status": "affected", "versionType": "git" }, { "version": "778c1144771f0064b6f51bee865cceb0d996f2f9", "lessThan": "138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2", "status": "affected", "versionType": "git" }, { "version": "778c1144771f0064b6f51bee865cceb0d996f2f9", "lessThan": "83b17872e3166c295c599279fc9562ac3840c638", "status": "affected", "versionType": "git" }, { "version": "778c1144771f0064b6f51bee865cceb0d996f2f9", "lessThan": "497c6bae5167428596575f20af6613ff5671f383", "status": "affected", "versionType": "git" }, { "version": "778c1144771f0064b6f51bee865cceb0d996f2f9", "lessThan": "dfd1894cb64cbd8758b461ed713800fe73db4f82", "status": "affected", "versionType": "git" }, { "version": "778c1144771f0064b6f51bee865cceb0d996f2f9", "lessThan": "6255da28d4bb5349fe18e84cb043ccd394eba75d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/proc/base.c", "fs/proc/fd.c", "fs/proc/internal.h" ], "versions": [ { "version": "2.6.18", "status": "affected" }, { "version": "0", "lessThan": "2.6.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.18", "versionEndExcluding": "7.2" } ] } ] } ], "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" } ], "title": "proc: protect ptrace_may_access() with exec_update_lock (FD links)", "x_generator": { "engine": "bippy-1.2.0" } } } }