CVE-2026-46259

In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_task_stat() When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- do_task_stat var = task->real_parent release_task call_rcu(delayed_put_task_struct) task_tgid_nr_ns(var) rcu_read_lock <--- Too late to protect task->real_parent! task_pid_ptr <--- UAF! rcu_read_unlock This patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add proper RCU protection for accessing task->real_parent.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e	Patch
https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306	Patch
https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee	Patch
https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6	Patch
https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867	Patch
https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982	Patch
https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6	Patch
https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

19 Oct 2026, 20:18

Type	Values Removed	Values Added
CWE		CWE-416

Information

Published : 2026-06-03 18:16

Updated : 2026-10-19 20:18

NVD link : CVE-2026-46259

Mitre link : CVE-2026-46259

CVE.ORG link : CVE-2026-46259

JSON object : View

Products Affected

linux

linux_kernel

CWE

NVD-CWE-noinfo CWE-416

Use After Free

{"id": "CVE-2026-46259", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46259", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:21:25.410048Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"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"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.26", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.252", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.202", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.165", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.128", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.75", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.14", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.4", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/proc/array.c"], "defaultStatus": "affected"}]}], "published": "2026-06-03T18:16:26.987", "references": [{"url": "https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-416"}]}], "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."}], "lastModified": "2026-10-19T20:18:39.850", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CEFA4799-47FB-4FB8-B0BD-07264C560EC8", "versionEndExcluding": "5.10.252", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671", "versionEndExcluding": "5.15.202", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "797C7F46-D0BE-4FB8-A502-C5EF8E6B6654", "versionEndExcluding": "6.1.165", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2", "versionEndExcluding": "6.6.128", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2", "versionEndExcluding": "6.12.75", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BF463CB7-1F58-4607-B847-77ED23E4B9B7", "versionEndExcluding": "6.18.14", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092", "versionEndExcluding": "6.19.4", "versionStartIncluding": "6.19"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}