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CVE-2026-72374 (GCVE-0-2026-72374)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
afs: Fix callback service message parsers to pass through -EAGAIN
Summary
In the Linux kernel, the following vulnerability has been resolved: afs: Fix callback service message parsers to pass through -EAGAIN The AFS filesystem client uses an rxrpc server to listen for callback notifications. Each callback call type handler has a delivery function that parses the incoming request stream, and this should return -EAGAIN the last packet hasn't yet been seen, but all currently queued received data is consumed. afs_extract_data() does this, but the -EAGAIN return is switched to 0 inadvertantly Fix callback service message parsers to pass through -EAGAIN
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 , < 26b737b3769e92493fe94c34620399d93ca231ae (git)
Affected: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 , < 09c67a7ded481482155b836c8c7f078a3075f8de (git)
Affected: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 , < 239cd337c9d047e7097f5b2ebbb41ddfb8180bc6 (git)
Affected: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 , < 5a39b145a8fb49f316e7ec1f29ba51d68095c7e4 (git)
Affected: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 , < 772850871a2e772e26f9d93f1e9ddd413b3eeaa4 (git)
Affected: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 , < 0acbc09d2aca0432af45cec114f20d55ceafaec4 (git)
Affected: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 , < f14dd036fad3d359f26f1282199cec06b3a9362b (git)
Affected: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 , < 0f36469d7ce98b362934113c550d08bb0c784231 (git)
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Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (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\nafs: Fix callback service message parsers to pass through -EAGAIN\n\nThe AFS filesystem client uses an rxrpc server to listen for callback\nnotifications.  Each callback call type handler has a delivery function\nthat parses the incoming request stream, and this should return -EAGAIN the\nlast packet hasn\u0027t yet been seen, but all currently queued received data is\nconsumed.  afs_extract_data() does this, but the -EAGAIN return is switched\nto 0 inadvertantly\n\nFix callback service message parsers to pass through -EAGAIN"
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              "value": "AV:N - Remote RxRPC traffic to the kafs cache manager on UDP/TCP port 7001 reaches afs_deliver_cb_init_call_back_state3() and afs_deliver_cb_probe_uuid() via rxrpc incoming-call handling (afs_rx_new_call \u2192 afs_deliver_cm_op_id \u2192 afs_cm_incoming_call \u2192 deliver parsers).\nAC:L - An attacker who controls an established callback RxRPC session can reliably force -EAGAIN by fragmenting CB.InitCallBackState3 or CB.ProbeUuid DATA across multiple packets; no special memory layout, races beyond attacker pacing, or rare victim state is required.\nPR:N - No local Linux account or capabilities on the victim are needed; exploitation is driven by a remote RxRPC peer sending fragmented cache-manager callbacks after the encrypted handshake on the callback socket (minimum RXRPC_SECURITY_ENCRYPT).\nUI:N - No victim user action (mounting AFS, opening files, or clicking anything) is required at exploit time; only an active kafs client with its per-net callback listener is needed as deployment context.\nS:U - Impact is confined to kernel/AFS cache-manager state on the victim host (NULL dereference oops, panic, or callback-protocol disruption) and does not cross VM, IOMMU, or sandbox security boundaries.\nC:N - The -EAGAIN mishandling returns success before UUID unmarshalling, leaving call-\u003erequest NULL; SRXAFSCB_ProbeUuid passes that pointer to memcmp(), causing a kernel fault without attacker-visible disclosure of victim data.\nI:N - The failure mode is premature parser completion and a NULL-pointer memcmp in SRXAFSCB_ProbeUuid (plus possible premature CM replies on InitCallBackState3); no arbitrary kernel write, heap corruption, or code-execution primitive is demonstrated.\nA:H - Treating -EAGAIN as success queues SRXAFSCB_ProbeUuid while call-\u003erequest is still NULL, and memcmp() on that pointer causes a kernel oops/panic; a remote peer can retrigger this on demand with fragmented CB.ProbeUuid callbacks."
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    "dateUpdated": "2026-08-17T05:43:27.599Z",
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Each callback call type handler has a delivery function\\nthat parses the incoming request stream, and this should return -EAGAIN the\\nlast packet hasn\u0027t yet been seen, but all currently queued received data is\\nconsumed.  afs_extract_data() does this, but the -EAGAIN return is switched\\nto 0 inadvertantly\\n\\nFix callback service message parsers to pass through -EAGAIN\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/afs/cmservice.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d001648ec7cf8b21ae9eec8b9ba4a18295adfb14\",\"lessThan\":\"26b737b3769e92493fe94c34620399d93ca231ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d001648ec7cf8b21ae9eec8b9ba4a18295adfb14\",\"lessThan\":\"09c67a7ded481482155b836c8c7f078a3075f8de\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d001648ec7cf8b21ae9eec8b9ba4a18295adfb14\",\"lessThan\":\"239cd337c9d047e7097f5b2ebbb41ddfb8180bc6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d001648ec7cf8b21ae9eec8b9ba4a18295adfb14\",\"lessThan\":\"5a39b145a8fb49f316e7ec1f29ba51d68095c7e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d001648ec7cf8b21ae9eec8b9ba4a18295adfb14\",\"lessThan\":\"772850871a2e772e26f9d93f1e9ddd413b3eeaa4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d001648ec7cf8b21ae9eec8b9ba4a18295adfb14\",\"lessThan\":\"0acbc09d2aca0432af45cec114f20d55ceafaec4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d001648ec7cf8b21ae9eec8b9ba4a18295adfb14\",\"lessThan\":\"f14dd036fad3d359f26f1282199cec06b3a9362b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d001648ec7cf8b21ae9eec8b9ba4a18295adfb14\",\"lessThan\":\"0f36469d7ce98b362934113c550d08bb0c784231\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/afs/cmservice.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/09c67a7ded481482155b836c8c7f078a3075f8de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0acbc09d2aca0432af45cec114f20d55ceafaec4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0f36469d7ce98b362934113c550d08bb0c784231\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/239cd337c9d047e7097f5b2ebbb41ddfb8180bc6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26b737b3769e92493fe94c34620399d93ca231ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a39b145a8fb49f316e7ec1f29ba51d68095c7e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/772850871a2e772e26f9d93f1e9ddd413b3eeaa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f14dd036fad3d359f26f1282199cec06b3a9362b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T06:53:06+00:00",
      "cve": "CVE-2026-72374",
      "id": "CVE-2026-72374",
      "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 callback service message parsers to pass through -EAGAIN",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72374.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.

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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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