{"id":"CVE-2026-46259","revision":"ed46d3d9a32f4ee893041bc89bd1b392","records":[{"revision":"ed46d3d9a32f4ee893041bc89bd1b392","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46259","aliases":[],"title":"procfs: fix missing RCU protection when reading real_parent in do_task_stat()","description":"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.","state":0,"publishedAt":"2026-06-03T15:49:56.428+00:00","modifiedAt":"2026-10-19T19:36:56.158+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/proc/array.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"06fffb1267c9d986687b69d74a46ee332a50575e\",\n                            \"lessThan\": \"fefa0fcd78be465b7ad4c497fa6ec90d64194c04\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"06fffb1267c9d986687b69d74a46ee332a50575e\",\n                            \"lessThan\": \"c93a33f28f915d446eea6fb3f0e1def0b3af1982\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"06fffb1267c9d986687b69d74a46ee332a50575e\",\n                            \"lessThan\": \"1c8dc5b5517546c68ffae40b948336122bb61306\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"06fffb1267c9d986687b69d74a46ee332a50575e\",\n                            \"lessThan\": \"0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"06fffb1267c9d986687b69d74a46ee332a50575e\",\n                            \"lessThan\": \"73ec7c96601d61d52310c659145bb06d933a0fa6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"06fffb1267c9d986687b69d74a46ee332a50575e\",\n                            \"lessThan\": \"4f9ae386861e280b7631ca252f798d25575627ee\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"06fffb1267c9d986687b69d74a46ee332a50575e\",\n                            \"lessThan\": \"dd8b13cb4ff1a4545a214ed897fdf2bc341155b6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"06fffb1267c9d986687b69d74a46ee332a50575e\",\n                            \"lessThan\": \"76149d53502cf17ef3ae454ff384551236fba867\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/proc/array.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.26\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.26\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.252\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.202\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.165\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.128\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.75\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.14\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.4\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04","https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982","https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306","https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e","https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6","https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee","https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6","https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46259","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46259","identifiers":["CVE-2026-46259"]},"retained":false,"historicalAffected":[]}],"coverage":[]}