{"id":"CVE-2026-98033","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve inner map identity in callback frames\n\nCallback frame constructors initialize map-typed argument registers with\n__mark_reg_known_zero() and then restore m…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve inner map identity in callback frames\n\nCallback frame constructors initialize map-typed argument registers with\n__mark_reg_known_zero() and then restore m…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 69c087ba6225b574afb6e505b72cb75242a3d844 < 66ff2eff093d2a0838f39c713eeb590bc0946c2a","Linux >= 69c087ba6225b574afb6e505b72cb75242a3d844 < b90c5d770dad910fb89e6c1b15052a8a1e8db752","Linux 5.13"],"published":"2026-09-25","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:18:10.067","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98033","references":[{"url":"https://git.kernel.org/stable/c/08b534bafdd9de65b6374474a8fe719c90eb3b01","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/66ff2eff093d2a0838f39c713eeb590bc0946c2a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b90c5d770dad910fb89e6c1b15052a8a1e8db752","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98033.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98033"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541194"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98033"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98033"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98033.mbox"},{"url":"https://git.kernel.org/stable/c/cf85e4f94d7feef8b3c4c90dbe2468595a48393b"},{"url":"https://git.kernel.org/stable/c/166221c52d3ca332f8699a854efca8e2704bb137"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.002,"epssPercentile":0.09817,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.851Z","slug":"CVE-2026-98033","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve inner map identity in callback frames\n\nCallback frame constructors initialize map-typed argument registers with\n__mark_reg_known_zero() and then restore map_ptr. This clears map_uid,\nwhich is the only field distinguishing inner maps that share an\ninner_map_meta template.\n\nWhen a timer callback invokes bpf_for_each_map_elem() on a second inner\nmap, both the saved first map and the second map value can reach the nested\ncallback as the same template with map_uid zero. bpf_timer_init() then\naccepts pairing the timer from the second map with the first map.\n\nThe runtime records the first map in the timer without taking a reference.\nFreeing that map does not find the timer stored in the second map, so a\nlater timer callback dereferences the freed map.\n\nCopy map_uid from the same caller register as map_ptr when constructing\nfor-each, timer/workqueue, and task-work callback arguments. The existing\nidentity check can then reject mismatched inner maps while allowing a\ncallback value to be paired with its actual map.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98033.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212446,"id":"CVE-2026-98033","ts":1790668182846,"field":"cvss","old":null,"new":"7"},{"seq":212445,"id":"CVE-2026-98033","ts":1790668182846,"field":"severity","old":"none","new":"high"}]}