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CVE-2026-72371 (GCVE-0-2026-72371)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
afs: Fix the volume AFS_VOLUME_RM_TREE is set on
Summary
In the Linux kernel, the following vulnerability has been resolved: afs: Fix the volume AFS_VOLUME_RM_TREE is set on Fix afs_insert_volume_into_cell() to set AFS_VOLUME_RM_TREE on the volume replaced, not the new volume, as it's now removed from the cell's volume tree. This will cause the old volume to be removed from the tree twice and the new volume never to be removed.
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: 98fb5eaade749e9d366fdd1f622d560ad68bdedd , < 6fa9a8a73e16aa22fce6e41cc00d59c767f0a540 (git)
Affected: 9b4c95a63e2dfe5ea73d92fb82ec34c3efa76284 , < c421bc6b957e56e45e12dbaeaf70a60db20d6465 (git)
Affected: c3215484ca1f64b6b8af03847856499e5364e65a , < 1607075220cf57161d9116512994c159eacefc0d (git)
Affected: 9a6b294ab496650e9f270123730df37030911b55 , < d154c20837f379343f192d4b8d9dd4ef145562e6 (git)
Affected: 9a6b294ab496650e9f270123730df37030911b55 , < 158c5a0b1dfc0e6a419efe18404047a4d2dff59e (git)
Affected: 9a6b294ab496650e9f270123730df37030911b55 , < d0c8ad418b47891a03426c5e02ebb0537f8d68f8 (git)
Affected: 9a6b294ab496650e9f270123730df37030911b55 , < 56b4e4b26f84411d880f968a539207b0a8889c8c (git)
Affected: 5.15.146 , < 5.15.212 (semver)
Affected: 6.1.70 , < 6.1.178 (semver)
Affected: 6.6.9 , < 6.6.145 (semver)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (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)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix the volume AFS_VOLUME_RM_TREE is set on\n\nFix afs_insert_volume_into_cell() to set AFS_VOLUME_RM_TREE on the volume\nreplaced, not the new volume, as it\u0027s now removed from the cell\u0027s volume\ntree.  This will cause the old volume to be removed from the tree twice and\nthe new volume never to be removed."
        }
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            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - The wrong AFS_VOLUME_RM_TREE assignment is only reached from afs_insert_volume_into_cell() during local AFS mount/automount (mount/fsopen\u2192afs_get_tree\u2192afs_validate_fc\u2192afs_create_volume), not from unsolicited inbound RxRPC callback packet handling alone.\nAC:L - An attacker can reliably win the refcount-zero replacement race by running concurrent threads that repeatedly mount or automount the same AFS volume while forcing concurrent teardown/expiry, controlling both the failing afs_try_get_volume() and the rb_replace_node_rcu() path.\nPR:L - Exploitation requires mounting or automounting AFS volumes, available to unprivileged users on typical kAFS clients with world-accessible /afs dynroot/automount paths, or via CAP_SYS_ADMIN inside a user/mount namespace; init-namespace root is not required.\nUI:N - No victim interaction is required beyond the attacker (or any local user on the shared kAFS client) issuing the mount/automount and concurrency operations that drive the volume-tree race.\nS:U - Impact is kernel heap/RB-tree corruption and use-after-free within the host kernel, enabling standard privilege escalation rather than crossing VM, container, or IOMMU security boundaries.\nC:H - Incorrect RM_TREE handling leaves freed afs_volume objects in cell-\u003evolumes or corrupts the RB-tree, producing slab use-after-free reads during volume lookups (the same UAF class as the original 9a6b294 race fix).\nI:H - RB-tree corruption and dangling volume entries provide attacker-influenced heap metadata corruption primitives that can be developed into arbitrary kernel writes or control-flow hijack, not merely a benign error return.\nA:H - The fault causes kernel oops/panic via use-after-free or corrupted RB-tree traversal during volume lookup/removal, and can be retriggered by repeated mount/automount races or subsequent callback-driven lookups."
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          "url": "https://git.kernel.org/stable/c/56b4e4b26f84411d880f968a539207b0a8889c8c"
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    "dateReserved": "2026-08-09T03:40:39.922Z",
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This will cause the old volume to be removed from the tree twice and\\nthe new volume never to be removed.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/afs/volume.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"98fb5eaade749e9d366fdd1f622d560ad68bdedd\",\"lessThan\":\"6fa9a8a73e16aa22fce6e41cc00d59c767f0a540\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b4c95a63e2dfe5ea73d92fb82ec34c3efa76284\",\"lessThan\":\"c421bc6b957e56e45e12dbaeaf70a60db20d6465\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c3215484ca1f64b6b8af03847856499e5364e65a\",\"lessThan\":\"1607075220cf57161d9116512994c159eacefc0d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9a6b294ab496650e9f270123730df37030911b55\",\"lessThan\":\"d154c20837f379343f192d4b8d9dd4ef145562e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9a6b294ab496650e9f270123730df37030911b55\",\"lessThan\":\"158c5a0b1dfc0e6a419efe18404047a4d2dff59e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9a6b294ab496650e9f270123730df37030911b55\",\"lessThan\":\"d0c8ad418b47891a03426c5e02ebb0537f8d68f8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9a6b294ab496650e9f270123730df37030911b55\",\"lessThan\":\"56b4e4b26f84411d880f968a539207b0a8889c8c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.146\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.70\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.9\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/afs/volume.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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/158c5a0b1dfc0e6a419efe18404047a4d2dff59e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1607075220cf57161d9116512994c159eacefc0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56b4e4b26f84411d880f968a539207b0a8889c8c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6fa9a8a73e16aa22fce6e41cc00d59c767f0a540\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c421bc6b957e56e45e12dbaeaf70a60db20d6465\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0c8ad418b47891a03426c5e02ebb0537f8d68f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d154c20837f379343f192d4b8d9dd4ef145562e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T13:35:34+00:00",
      "cve": "CVE-2026-72371",
      "id": "CVE-2026-72371",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: afs: Fix the volume AFS_VOLUME_RM_TREE is set on",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72371.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.