CVE-2026-63827 (GCVE-0-2026-63827)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
apparmor: fix use-after-free in rawdata dedup loop
Summary
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix use-after-free in rawdata dedup loop aa_replace_profiles() walks ns->rawdata_list to dedup the incoming policy blob against entries already attached to existing profiles. Per the kernel-doc on struct aa_loaddata, list membership does not hold a reference: profiles hold pcount, and when the last pcount drops, do_ploaddata_rmfs() is queued on a workqueue that takes ns->lock and removes the entry. Between dropping the last pcount and the workqueue running, an entry remains on the list with pcount == 0. aa_get_profile_loaddata() is an unconditional kref_get() on pcount, so when the dedup loop hits such an entry, refcount hardening reports refcount_t: addition on 0; use-after-free. inside aa_replace_profiles(), and the poisoned counter then trips "saturated" and "underflow" warnings on the subsequent uses of the same loaddata. Before commit a0b7091c4de4 ("apparmor: fix race on rawdata dereference") the dedup path used a get_unless_zero-style helper on a single counter, so the existing "if (tmp)" guard was meaningful. The split-refcount refactor introduced aa_get_profile_loaddata(), which has plain kref_get() semantics, and the guard quietly became a no-op. Introduce aa_get_profile_loaddata_not0(), matching the existing _not0 convention used by aa_get_profile_not0(), and use it for the rawdata_list dedup lookup so dying entries are skipped. Reproduced on x86_64 with v7.1-rc5 in QEMU+KVM running Ubuntu 24.04 + stress-ng 0.17.06: stress-ng --apparmor 1 --klog-check --timeout 60s Without this patch the three refcount_t warnings fire within a few seconds. With it the same 60 s run is clean. Coverage is a smoke-test only; a longer soak with CONFIG_KASAN, CONFIG_KCSAN and CONFIG_PROVE_LOCKING would be welcome from anyone with the cycles.
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
Linux Linux Affected: 6b6ba87579c7e7c669e0bec91823e7fb693bc5df , < a7a2890028f16e5b0af0bb005d80fcb32559cca3 (git)
Affected: 6ef1f2926c41ab96952d9696d55a052f1b3a9418 , < 15fd83a1e42ede15070968806bb6c8b1a5170688 (git)
Affected: f9761add6d100962a23996cb68f3d6abdd4d1815 , < ce261a20b41db522e320a41bbf1292bf85af66df (git)
Affected: af782cc8871e3683ddd5a3cd2f7df526599863a9 , < c3ca2631073b2cef06824fd2bfc452ff7a1023de (git)
Affected: a0b7091c4de45a7325c8780e6934a894f92ac86b , < 5e34fa9f6f7cd688ae153fff13139a5cf2d42339 (git)
Affected: a0b7091c4de45a7325c8780e6934a894f92ac86b , < 6f060496d03e4dc560a40f73770bd08335cb7a27 (git)
Affected: 3b8e77c7abab40e6de9ad9de730d77984a498840 (git)
Affected: d9d8560b9b7932f8cffc4c068c14289220900f79 (git)
Affected: 763e838adc3c7ec5a7df2990ce84cad951e42721 (git)
Affected: 6.1.169 , < 6.1.177 (semver)
Affected: 6.6.130 , < 6.6.144 (semver)
Affected: 6.12.77 , < 6.12.95 (semver)
Affected: 6.18.18 , < 6.18.38 (semver)
Affected: 5.10.253 , < 5.11 (semver)
Affected: 5.15.203 , < 5.16 (semver)
Affected: 6.19.8 , < 6.20 (semver)
Create a notification for this product.
Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix use-after-free in rawdata dedup loop\n\naa_replace_profiles() walks ns-\u003erawdata_list to dedup the incoming\npolicy blob against entries already attached to existing profiles.\nPer the kernel-doc on struct aa_loaddata, list membership does not\nhold a reference: profiles hold pcount, and when the last pcount\ndrops, do_ploaddata_rmfs() is queued on a workqueue that takes\nns-\u003elock and removes the entry. Between dropping the last pcount\nand the workqueue running, an entry remains on the list with\npcount == 0.\n\naa_get_profile_loaddata() is an unconditional kref_get() on\npcount, so when the dedup loop hits such an entry, refcount\nhardening reports\n\n  refcount_t: addition on 0; use-after-free.\n\ninside aa_replace_profiles(), and the poisoned counter then\ntrips \"saturated\" and \"underflow\" warnings on the subsequent\nuses of the same loaddata.\n\nBefore commit a0b7091c4de4 (\"apparmor: fix race on rawdata\ndereference\") the dedup path used a get_unless_zero-style helper\non a single counter, so the existing \"if (tmp)\" guard was\nmeaningful. The split-refcount refactor introduced\naa_get_profile_loaddata(), which has plain kref_get() semantics,\nand the guard quietly became a no-op.\n\nIntroduce aa_get_profile_loaddata_not0(), matching the existing\n_not0 convention used by aa_get_profile_not0(), and use it for\nthe rawdata_list dedup lookup so dying entries are skipped.\n\nReproduced on x86_64 with v7.1-rc5 in QEMU+KVM running Ubuntu\n24.04 + stress-ng 0.17.06:\n\n  stress-ng --apparmor 1 --klog-check --timeout 60s\n\nWithout this patch the three refcount_t warnings fire within a\nfew seconds. With it the same 60 s run is clean. Coverage is a\nsmoke-test only; a longer soak with CONFIG_KASAN, CONFIG_KCSAN\nand CONFIG_PROVE_LOCKING would be welcome from anyone with the\ncycles."
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    "dateUpdated": "2026-07-20T13:40:30.633Z",
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      "cve": "CVE-2026-63827",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "apparmor: fix use-after-free in rawdata dedup loop",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63827.json",
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Between dropping the last pcount\\nand the workqueue running, an entry remains on the list with\\npcount == 0.\\n\\naa_get_profile_loaddata() is an unconditional kref_get() on\\npcount, so when the dedup loop hits such an entry, refcount\\nhardening reports\\n\\n  refcount_t: addition on 0; use-after-free.\\n\\ninside aa_replace_profiles(), and the poisoned counter then\\ntrips \\\"saturated\\\" and \\\"underflow\\\" warnings on the subsequent\\nuses of the same loaddata.\\n\\nBefore commit a0b7091c4de4 (\\\"apparmor: fix race on rawdata\\ndereference\\\") the dedup path used a get_unless_zero-style helper\\non a single counter, so the existing \\\"if (tmp)\\\" guard was\\nmeaningful. The split-refcount refactor introduced\\naa_get_profile_loaddata(), which has plain kref_get() semantics,\\nand the guard quietly became a no-op.\\n\\nIntroduce aa_get_profile_loaddata_not0(), matching the existing\\n_not0 convention used by aa_get_profile_not0(), and use it for\\nthe rawdata_list dedup lookup so dying entries are skipped.\\n\\nReproduced on x86_64 with v7.1-rc5 in QEMU+KVM running Ubuntu\\n24.04 + stress-ng 0.17.06:\\n\\n  stress-ng --apparmor 1 --klog-check --timeout 60s\\n\\nWithout this patch the three refcount_t warnings fire within a\\nfew seconds. With it the same 60 s run is clean. Coverage is a\\nsmoke-test only; a longer soak with CONFIG_KASAN, CONFIG_KCSAN\\nand CONFIG_PROVE_LOCKING would be welcome from anyone with the\\ncycles.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"security/apparmor/include/policy_unpack.h\",\"security/apparmor/policy.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6b6ba87579c7e7c669e0bec91823e7fb693bc5df\",\"lessThan\":\"a7a2890028f16e5b0af0bb005d80fcb32559cca3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6ef1f2926c41ab96952d9696d55a052f1b3a9418\",\"lessThan\":\"15fd83a1e42ede15070968806bb6c8b1a5170688\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f9761add6d100962a23996cb68f3d6abdd4d1815\",\"lessThan\":\"ce261a20b41db522e320a41bbf1292bf85af66df\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af782cc8871e3683ddd5a3cd2f7df526599863a9\",\"lessThan\":\"c3ca2631073b2cef06824fd2bfc452ff7a1023de\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a0b7091c4de45a7325c8780e6934a894f92ac86b\",\"lessThan\":\"5e34fa9f6f7cd688ae153fff13139a5cf2d42339\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a0b7091c4de45a7325c8780e6934a894f92ac86b\",\"lessThan\":\"6f060496d03e4dc560a40f73770bd08335cb7a27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b8e77c7abab40e6de9ad9de730d77984a498840\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d9d8560b9b7932f8cffc4c068c14289220900f79\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"763e838adc3c7ec5a7df2990ce84cad951e42721\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.1.169\",\"lessThan\":\"6.1.177\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.130\",\"lessThan\":\"6.6.144\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.77\",\"lessThan\":\"6.12.95\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.18\",\"lessThan\":\"6.18.38\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.253\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.203\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.19.8\",\"lessThan\":\"6.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"security/apparmor/include/policy_unpack.h\",\"security/apparmor/policy.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/15fd83a1e42ede15070968806bb6c8b1a5170688\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5e34fa9f6f7cd688ae153fff13139a5cf2d42339\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f060496d03e4dc560a40f73770bd08335cb7a27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7a2890028f16e5b0af0bb005d80fcb32559cca3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3ca2631073b2cef06824fd2bfc452ff7a1023de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce261a20b41db522e320a41bbf1292bf85af66df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:06:39+00:00",
      "cve": "CVE-2026-63827",
      "id": "CVE-2026-63827",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: apparmor: fix use-after-free in rawdata dedup loop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63827.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.