CVE-2026-80619 (GCVE-0-2026-80619)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-29 06:21
VLAI
Title
apparmor: fix potential UAF in aa_replace_profiles
Summary
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix potential UAF in aa_replace_profiles The function aa_replace_profiles was accessing udata->size after calling aa_put_loaddata(udata), causing a potential UAF. Fixed this by saving the size to a local variable before dropping the reference.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5ac8c355ae0013d82b3a07b49aebeadfce9b6e52 , < 9d8e47cbce7536f19c96e37d0685a042010187ee (git)
Affected: 5ac8c355ae0013d82b3a07b49aebeadfce9b6e52 , < 9d37dc6376e336dc4b4f39a7ad0d069aa70e9495 (git)
Affected: 5ac8c355ae0013d82b3a07b49aebeadfce9b6e52 , < c0f3a3fda617beeec58708720304dd026a1a4dd7 (git)
Affected: 5ac8c355ae0013d82b3a07b49aebeadfce9b6e52 , < 5cba148eae6e8550c2889f5c0f94d72bed864321 (git)
Affected: 5ac8c355ae0013d82b3a07b49aebeadfce9b6e52 , < c44de0880b7ccc15c70a6352b5e107677d32b061 (git)
Affected: 5ac8c355ae0013d82b3a07b49aebeadfce9b6e52 , < 57b1bd4486d56254bb8af1a8f3d4445bbe505290 (git)
Affected: 5ac8c355ae0013d82b3a07b49aebeadfce9b6e52 , < dd5f1202f45a2dbe2c7dd10093f5c6bb2d8ac5bb (git)
Affected: 5ac8c355ae0013d82b3a07b49aebeadfce9b6e52 , < 7b42f95813dc9ceb6bda35afcf914630909a19f9 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "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-\u003esize 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."
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            "baseSeverity": "HIGH",
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              "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() -\u003e 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-\u003esize 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\u0027s own write of policy data to .load/.replace; no separate victim action, mount, or administrator interaction beyond the attacker\u0027s 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-\u003esize 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 attempted."
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    "dateReserved": "2026-08-26T14:34:25.774Z",
    "dateUpdated": "2026-08-29T06:21:26.537Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T10:51:50+00:00",
      "cve": "CVE-2026-80619",
      "id": "CVE-2026-80619",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: apparmor: fix potential UAF in aa_replace_profiles",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80619.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.