{"api_version":"1","generated_at":"2026-08-23T06:07:44+00:00","cve":"CVE-2026-72374","urls":{"html":"https://cve.report/CVE-2026-72374","api":"https://cve.report/api/cve/CVE-2026-72374.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72374","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72374"},"summary":{"title":"afs: Fix callback service message parsers to pass through -EAGAIN","description":"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't 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","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:10","updated_at":"2026-08-17 06:18:41"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"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"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/0acbc09d2aca0432af45cec114f20d55ceafaec4","name":"https://git.kernel.org/stable/c/0acbc09d2aca0432af45cec114f20d55ceafaec4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/239cd337c9d047e7097f5b2ebbb41ddfb8180bc6","name":"https://git.kernel.org/stable/c/239cd337c9d047e7097f5b2ebbb41ddfb8180bc6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f14dd036fad3d359f26f1282199cec06b3a9362b","name":"https://git.kernel.org/stable/c/f14dd036fad3d359f26f1282199cec06b3a9362b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/09c67a7ded481482155b836c8c7f078a3075f8de","name":"https://git.kernel.org/stable/c/09c67a7ded481482155b836c8c7f078a3075f8de","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0f36469d7ce98b362934113c550d08bb0c784231","name":"https://git.kernel.org/stable/c/0f36469d7ce98b362934113c550d08bb0c784231","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5a39b145a8fb49f316e7ec1f29ba51d68095c7e4","name":"https://git.kernel.org/stable/c/5a39b145a8fb49f316e7ec1f29ba51d68095c7e4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/26b737b3769e92493fe94c34620399d93ca231ae","name":"https://git.kernel.org/stable/c/26b737b3769e92493fe94c34620399d93ca231ae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/772850871a2e772e26f9d93f1e9ddd413b3eeaa4","name":"https://git.kernel.org/stable/c/772850871a2e772e26f9d93f1e9ddd413b3eeaa4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72374","name":"CVE 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72374","cve":"CVE-2026-72374","epss":"0.007160000","percentile":"0.507270000","score_date":"2026-08-17","updated_at":"2026-08-18 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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't 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"}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","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 → afs_deliver_cm_op_id → afs_cm_incoming_call → 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->request 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->request 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."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:43:27.599Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/26b737b3769e92493fe94c34620399d93ca231ae"},{"url":"https://git.kernel.org/stable/c/09c67a7ded481482155b836c8c7f078a3075f8de"},{"url":"https://git.kernel.org/stable/c/239cd337c9d047e7097f5b2ebbb41ddfb8180bc6"},{"url":"https://git.kernel.org/stable/c/5a39b145a8fb49f316e7ec1f29ba51d68095c7e4"},{"url":"https://git.kernel.org/stable/c/772850871a2e772e26f9d93f1e9ddd413b3eeaa4"},{"url":"https://git.kernel.org/stable/c/0acbc09d2aca0432af45cec114f20d55ceafaec4"},{"url":"https://git.kernel.org/stable/c/f14dd036fad3d359f26f1282199cec06b3a9362b"},{"url":"https://git.kernel.org/stable/c/0f36469d7ce98b362934113c550d08bb0c784231"}],"title":"afs: Fix callback service message parsers to pass through -EAGAIN","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72374","datePublished":"2026-08-15T05:56:09.182Z","dateReserved":"2026-08-09T03:40:39.922Z","dateUpdated":"2026-08-17T05:43:27.599Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:10","lastModifiedDate":"2026-08-17 06:18:41","problem_types":[],"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72374","Ordinal":"1","Title":"afs: Fix callback service message parsers to pass through -EAGAI","CVE":"CVE-2026-72374","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72374","Ordinal":"1","NoteData":"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't 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","Type":"Description","Title":"afs: Fix callback service message parsers to pass through -EAGAI"}]}}}