CVE-2026-46259

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task->real_parent!\n task_pid_ptr <--- UAF!\n rcu_read_unlock\n\nThis patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add\nproper RCU protection for accessing task->real_parent."}], "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 requires local `open()`/`read()` on procfs (`/proc/[pid]/stat` or thread `stat`); there is no network, adjacent-radio, or physical-device path to `do_task_stat()`.\nAC:L - An attacker can reliably race by running concurrent `read()` loops on `/proc/child/stat` while another thread exits and reaps the parent via `wait4()`, controlling both sides of the `release_task()`/`call_rcu()` window.\nPR:L - Triggering the bug needs only an unprivileged local account that can read procfs (default `hidepid=off` allows reading other users\u2019 `stat`); no real root or init-namespace-only capability is required.\nUI:N - Exploitation is fully attacker-driven through syscalls and process lifecycle control; no victim user action (clicks, mounts, etc.) is needed.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain, not a cross-boundary escape such as VM guest-to-host.\nC:H - The UAF dereferences freed `task_struct` memory via `task_pid_ptr()`/`__task_pid_nr_ns()`, enabling disclosure of stale slab contents and kernel pointers that can be groomed into an arbitrary-read primitive.\nI:H - Use-after-free on a `task_struct` slab object can be leveraged with heap grooming for control of freed memory and potential arbitrary write or code execution, not merely a bounded or cosmetic change.\nA:H - Concurrent UAF access to a freed parent `task_struct` can cause kernel oops/panic (KASAN reports slab-use-after-free class failures) even when full exploitation is not attempted."}]}], "affected": [{"product": "Linux", "vendor": "Linux", 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"6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "2.6.26", "versionEndExcluding": "5.10.252"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.15.202"}, {"vulnerable": true, "criteria": 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"https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982"}, {"url": "https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306"}, {"url": "https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e"}, {"url": "https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6"}, {"url": "https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee"}, {"url": "https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6"}, {"url": "https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867"}], "title": "procfs: fix missing RCU protection when reading real_parent in do_task_stat()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-46259", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:21:25.410048Z"}}}], 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by running concurrent `read()` loops on `/proc/child/stat` while another thread exits and reaps the parent via `wait4()`, controlling both sides of the `release_task()`/`call_rcu()` window.\nPR:L - Triggering the bug needs only an unprivileged local account that can read procfs (default `hidepid=off` allows reading other users\u2019 `stat`); no real root or init-namespace-only capability is required.\nUI:N - Exploitation is fully attacker-driven through syscalls and process lifecycle control; no victim user action (clicks, mounts, etc.) is needed.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain, not a cross-boundary escape such as VM guest-to-host.\nC:H - The UAF dereferences freed `task_struct` memory via `task_pid_ptr()`/`__task_pid_nr_ns()`, enabling disclosure of stale slab contents and kernel pointers that can be groomed into an arbitrary-read primitive.\nI:H - Use-after-free on a `task_struct` slab object can be leveraged with heap grooming for control of freed memory and potential arbitrary write or code execution, not merely a bounded or cosmetic change.\nA:H - Concurrent UAF access to a freed parent `task_struct` can cause kernel oops/panic (KASAN reports slab-use-after-free class failures) even when full exploitation is not attempted."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "06fffb1267c9d986687b69d74a46ee332a50575e", "lessThan": "fefa0fcd78be465b7ad4c497fa6ec90d64194c04", "versionType": "git"}, {"status": "affected", "version": "06fffb1267c9d986687b69d74a46ee332a50575e", "lessThan": "c93a33f28f915d446eea6fb3f0e1def0b3af1982", "versionType": "git"}, {"status": "affected", "version": "06fffb1267c9d986687b69d74a46ee332a50575e", "lessThan": "1c8dc5b5517546c68ffae40b948336122bb61306", "versionType": "git"}, {"status": "affected", "version": "06fffb1267c9d986687b69d74a46ee332a50575e", "lessThan": "0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e", "versionType": "git"}, {"status": "affected", "version": "06fffb1267c9d986687b69d74a46ee332a50575e", "lessThan": "73ec7c96601d61d52310c659145bb06d933a0fa6", "versionType": "git"}, {"status": "affected", "version": "06fffb1267c9d986687b69d74a46ee332a50575e", "lessThan": "4f9ae386861e280b7631ca252f798d25575627ee", "versionType": "git"}, {"status": "affected", "version": "06fffb1267c9d986687b69d74a46ee332a50575e", "lessThan": "dd8b13cb4ff1a4545a214ed897fdf2bc341155b6", "versionType": "git"}, {"status": "affected", "version": "06fffb1267c9d986687b69d74a46ee332a50575e", "lessThan": "76149d53502cf17ef3ae454ff384551236fba867", "versionType": "git"}], "programFiles": ["fs/proc/array.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.26"}, 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proper RCU protection, which leads to:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task->real_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock <--- Too late to protect task->real_parent!\n task_pid_ptr <--- UAF!\n rcu_read_unlock\n\nThis patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add\nproper RCU protection for accessing task->real_parent."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.252", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.202", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.165", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092", "versionEndExcluding": "6.19.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nprocfs: fix missing RCU protection when reading real_parent in do_task_stat()\n\nWhen reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent\nwithout proper RCU protection, which leads to:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task->real_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock <--- Too late to protect task->real_parent!\n task_pid_ptr <--- UAF!\n rcu_read_unlock\n\nThis patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add\nproper RCU protection for accessing task->real_parent."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nprocfs: corrige la falta de protecci\u00f3n RCU al leer real_parent en do_task_stat()\n\nAl leer /proc/[pid]/stat, do_task_stat() accede a task->real_parent sin la protecci\u00f3n RCU adecuada, lo que lleva a:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task->real_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock <--- \u00a1Demasiado tarde para proteger task->real_parent!\n task_pid_ptr <--- \u00a1UAF!\n rcu_read_unlock\n\nEste parche utiliza task_ppid_nr_ns() en lugar de task_tgid_nr_ns() para a\u00f1adir la protecci\u00f3n RCU adecuada para acceder a task->real_parent."}], "id": "CVE-2026-46259", "lastModified": "2026-10-19T20:18:39.850", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46259", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:21:25.410048Z", "version": "2.0.3"}}]}, "published": "2026-06-03T18:16:26.987", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat()", "id": "2484477", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484477"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-820", "details": ["A flaw was found in the Linux kernel's procfs component. When reading /proc/[pid]/stat, the do_task_stat() function accesses task->real_parent without proper Read-Copy-Update (RCU) protection. This missing protection creates a race condition, which can lead to a Use-After-Free (UAF) vulnerability. A local attacker could potentially exploit this to cause a system crash or achieve other unspecified impacts."], "name": "CVE-2026-46259", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46259\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46259\nhttps://lore.kernel.org/linux-cve-announce/2026060336-CVE-2026-46259-6c94@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06fffb1267c9d986687b69d74a46ee332a50575e,fefa0fcd78be465b7ad4c497fa6ec90d64194c04)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06fffb1267c9d986687b69d74a46ee332a50575e,c93a33f28f915d446eea6fb3f0e1def0b3af1982)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06fffb1267c9d986687b69d74a46ee332a50575e,1c8dc5b5517546c68ffae40b948336122bb61306)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06fffb1267c9d986687b69d74a46ee332a50575e,0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06fffb1267c9d986687b69d74a46ee332a50575e,73ec7c96601d61d52310c659145bb06d933a0fa6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06fffb1267c9d986687b69d74a46ee332a50575e,4f9ae386861e280b7631ca252f798d25575627ee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06fffb1267c9d986687b69d74a46ee332a50575e,dd8b13cb4ff1a4545a214ed897fdf2bc341155b6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06fffb1267c9d986687b69d74a46ee332a50575e,76149d53502cf17ef3ae454ff384551236fba867)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.26"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.26)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.252,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.202,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.165,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.128,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.75,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.14,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.4,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-03T18:45:40.187417+00:00", "updated": "2026-10-20T01:45:07.574407+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-820"]}