{"api_version":"1","generated_at":"2026-08-29T12:13:31+00:00","cve":"CVE-2026-80619","urls":{"html":"https://cve.report/CVE-2026-80619","api":"https://cve.report/api/cve/CVE-2026-80619.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80619","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80619"},"summary":{"title":"apparmor: fix potential UAF in aa_replace_profiles","description":"In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix potential UAF in aa_replace_profiles\n\nThe function aa_replace_profiles was accessing udata->size after calling\naa_put_loaddata(udata), causing a potential UAF.\n\nFixed this by saving the size to a local variable before dropping the\nreference.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:45","updated_at":"2026-08-29 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the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix potential UAF in aa_replace_profiles\n\nThe function aa_replace_profiles was accessing udata->size after calling\naa_put_loaddata(udata), causing a potential UAF.\n\nFixed this by saving the size to a local variable before dropping the\nreference."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is only reachable via local write() to AppArmor policy management interfaces (/sys/kernel/security/apparmor/.load or .replace, or namespace .load/.replace under apparmorfs), which invoke policy_update() -> aa_replace_profiles(); there is no network or adjacent protocol path.\nAC:L - An attacker with policy-admin rights can trigger the bug by loading or replacing policy (including duplicate rawdata dedup paths) while concurrently removing/replacing profiles so aa_put_profile_loaddata() at the out label can drop the last pcount and schedule do_ploaddata_rmfs() before udata->size is read; the attacker controls both sides of this race.\nPR:L - aa_replace_profiles() is gated by aa_may_manage_policy(), which requires CAP_MAC_ADMIN and policy-view rights; with default unprivileged_userns_apparmor_policy=1, namespace UID 0 in an unprivileged user namespace can satisfy these without init-namespace root, matching prior AppArmor policy-load CVE scoring.\nUI:N - Exploitation requires only the attacker's own write of policy data to .load/.replace; no separate victim action, mount, or administrator interaction beyond the attacker's policy-management operation is needed.\nS:U - The UAF corrupts kernel AppArmor loaddata within the same OS security authority as the caller; it is standard kernel memory corruption/local privilege escalation, not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Reading udata->size after aa_put_profile_loaddata() is a use-after-free on struct aa_loaddata; freed heap objects can be reallocated and the size field read gives attacker-influenced kernel heap disclosure primitives per kernel CVSS UAF guidance.\nI:H - UAF on aa_loaddata enables heap grooming and corruption of adjacent kernel objects through controlled policy load/free timing, providing a well-established path to arbitrary kernel writes and local privilege escalation beyond the initial policy-admin capability.\nA:H - When the last profile reference is dropped at cleanup, the deferred free can run before the post-put size read, causing refcount corruption, kernel oops/BUG, or panic; UAF bugs are scored Availability High even when full exploitation is not 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potential UAF.\n\nFixed this by saving the size to a local variable before dropping the\nreference.","Type":"Description","Title":"apparmor: fix potential UAF in aa_replace_profiles"}]}}}