{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72374", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.922Z", "datePublished": "2026-08-15T05:56:09.182Z", "dateUpdated": "2026-08-17T05:43:27.599Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:27.599Z" }, "descriptions": [ { "lang": "en", "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'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": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/afs/cmservice.c" ], "versions": [ { "version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14", "lessThan": "26b737b3769e92493fe94c34620399d93ca231ae", "status": "affected", "versionType": "git" }, { "version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14", "lessThan": "09c67a7ded481482155b836c8c7f078a3075f8de", "status": "affected", "versionType": "git" }, { "version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14", "lessThan": "239cd337c9d047e7097f5b2ebbb41ddfb8180bc6", "status": "affected", "versionType": "git" }, { "version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14", "lessThan": "5a39b145a8fb49f316e7ec1f29ba51d68095c7e4", "status": "affected", "versionType": "git" }, { "version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14", "lessThan": "772850871a2e772e26f9d93f1e9ddd413b3eeaa4", "status": "affected", "versionType": "git" }, { "version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14", "lessThan": "0acbc09d2aca0432af45cec114f20d55ceafaec4", "status": "affected", "versionType": "git" }, { "version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14", "lessThan": "f14dd036fad3d359f26f1282199cec06b3a9362b", "status": "affected", "versionType": "git" }, { "version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14", "lessThan": "0f36469d7ce98b362934113c550d08bb0c784231", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/afs/cmservice.c" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }