CVE-2025-21854

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This is handled with a NULL check in the vsock/BPF recv path.\n\nAnother design detail is that listening vsocks are not supposed to have any\ntransport assigned at all. Which implies they are not supported by the\nsockmap. But this is complicated by the fact that a socket, before\nswitching to TCP_LISTEN, may have had some transport assigned during a\nfailed connect() attempt. Hence, we may end up with a listening vsock in a\nsockmap, which blows up quickly:\n\nKASAN: null-ptr-deref in range [0x0000000000000120-0x0000000000000127]\nCPU: 7 UID: 0 PID: 56 Comm: kworker/7:0 Not tainted 6.14.0-rc1+\nWorkqueue: vsock-loopback vsock_loopback_work\nRIP: 0010:vsock_read_skb+0x4b/0x90\nCall Trace:\n sk_psock_verdict_data_ready+0xa4/0x2e0\n virtio_transport_recv_pkt+0x1ca8/0x2acc\n vsock_loopback_work+0x27d/0x3f0\n process_one_work+0x846/0x1420\n worker_thread+0x5b3/0xf80\n kthread+0x35a/0x700\n ret_from_fork+0x2d/0x70\n ret_from_fork_asm+0x1a/0x30\n\nFor connectible sockets, instead of relying solely on the state of\nvsk->transport, tell sockmap to only allow those representing established\nconnections. This aligns with the behaviour for AF_INET and AF_UNIX."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/sock_map.c"], "versions": [{"version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f", "lessThan": "cc9a7832ede53ade1ba9991f0e27314caa4029d8", "status": "affected", "versionType": "git"}, {"version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f", "lessThan": "22b683217ad2112791a708693cb236507abd637a", "status": "affected", "versionType": "git"}, {"version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f", "lessThan": "f7b473e35986835cc2813fef7b9d40336a09247e", "status": "affected", "versionType": "git"}, {"version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f", "lessThan": "8fb5bb169d17cdd12c2dcc2e96830ed487d77a0f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/sock_map.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.80", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.17", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.5", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14", "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": "6.4", "versionEndExcluding": "6.6.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.13.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.14"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/cc9a7832ede53ade1ba9991f0e27314caa4029d8"}, {"url": "https://git.kernel.org/stable/c/22b683217ad2112791a708693cb236507abd637a"}, {"url": "https://git.kernel.org/stable/c/f7b473e35986835cc2813fef7b9d40336a09247e"}, {"url": "https://git.kernel.org/stable/c/8fb5bb169d17cdd12c2dcc2e96830ed487d77a0f"}], "title": "sockmap, vsock: For connectible sockets allow only connected", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-21854", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-10-01T19:26:04.052648Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:26:38.493Z"}}]}}

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However, there is an edge case\nwhere an unconnected (connectible) socket may lose its previously assigned\ntransport. This is handled with a NULL check in the vsock/BPF recv path.\n\nAnother design detail is that listening vsocks are not supposed to have any\ntransport assigned at all. Which implies they are not supported by the\nsockmap. But this is complicated by the fact that a socket, before\nswitching to TCP_LISTEN, may have had some transport assigned during a\nfailed connect() attempt. Hence, we may end up with a listening vsock in a\nsockmap, which blows up quickly:\n\nKASAN: null-ptr-deref in range [0x0000000000000120-0x0000000000000127]\nCPU: 7 UID: 0 PID: 56 Comm: kworker/7:0 Not tainted 6.14.0-rc1+\nWorkqueue: vsock-loopback vsock_loopback_work\nRIP: 0010:vsock_read_skb+0x4b/0x90\nCall Trace:\n sk_psock_verdict_data_ready+0xa4/0x2e0\n virtio_transport_recv_pkt+0x1ca8/0x2acc\n vsock_loopback_work+0x27d/0x3f0\n process_one_work+0x846/0x1420\n worker_thread+0x5b3/0xf80\n kthread+0x35a/0x700\n ret_from_fork+0x2d/0x70\n ret_from_fork_asm+0x1a/0x30\n\nFor connectible sockets, instead of relying solely on the state of\nvsk->transport, tell sockmap to only allow those representing established\nconnections. This aligns with the behaviour for AF_INET and AF_UNIX."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.80", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.17", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13.5", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.14", "versionStartIncluding": "6.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:07:47.588Z"}}}, "cveMetadata": {"cveId": "CVE-2025-21854", "state": "PUBLISHED", "dateUpdated": "2026-05-11T21:07:47.588Z", "dateReserved": "2024-12-29T08:45:45.780Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-03-12T09:42:08.556Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/sock_map.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cc9a7832ede53ade1ba9991f0e27314caa4029d8", "status": "affected", "version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f", "versionType": "git"}, {"lessThan": "22b683217ad2112791a708693cb236507abd637a", "status": "affected", "version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f", "versionType": "git"}, {"lessThan": "f7b473e35986835cc2813fef7b9d40336a09247e", "status": "affected", "version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f", "versionType": "git"}, {"lessThan": "8fb5bb169d17cdd12c2dcc2e96830ed487d77a0f", "status": "affected", "version": "634f1a7110b439c65fd8a809171c1d2d28bcea6f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/sock_map.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"lessThan": "6.4", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.80", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.17", "versionType": "semver"}, {"lessThanOrEqual": "6.13.*", "status": "unaffected", "version": "6.13.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0A245516-337D-45F8-8FB1-0DAC50C3D818", "versionEndExcluding": "6.6.80", "versionStartIncluding": "6.4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "15370AEE-6D1C-49C3-8CB7-E889D5F92B6F", "versionEndExcluding": "6.12.17", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "72E69ABB-9015-43A6-87E1-5150383CFFD9", "versionEndExcluding": "6.13.5", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*", "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*", "matchCriteriaId": "66619FB8-0AAF-4166-B2CF-67B24143261D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsockmap, vsock: For connectible sockets allow only connected\n\nsockmap expects all vsocks to have a transport assigned, which is expressed\nin vsock_proto::psock_update_sk_prot(). However, there is an edge case\nwhere an unconnected (connectible) socket may lose its previously assigned\ntransport. This is handled with a NULL check in the vsock/BPF recv path.\n\nAnother design detail is that listening vsocks are not supposed to have any\ntransport assigned at all. Which implies they are not supported by the\nsockmap. But this is complicated by the fact that a socket, before\nswitching to TCP_LISTEN, may have had some transport assigned during a\nfailed connect() attempt. Hence, we may end up with a listening vsock in a\nsockmap, which blows up quickly:\n\nKASAN: null-ptr-deref in range [0x0000000000000120-0x0000000000000127]\nCPU: 7 UID: 0 PID: 56 Comm: kworker/7:0 Not tainted 6.14.0-rc1+\nWorkqueue: vsock-loopback vsock_loopback_work\nRIP: 0010:vsock_read_skb+0x4b/0x90\nCall Trace:\n sk_psock_verdict_data_ready+0xa4/0x2e0\n virtio_transport_recv_pkt+0x1ca8/0x2acc\n vsock_loopback_work+0x27d/0x3f0\n process_one_work+0x846/0x1420\n worker_thread+0x5b3/0xf80\n kthread+0x35a/0x700\n ret_from_fork+0x2d/0x70\n ret_from_fork_asm+0x1a/0x30\n\nFor connectible sockets, instead of relying solely on the state of\nvsk->transport, tell sockmap to only allow those representing established\nconnections. This aligns with the behaviour for AF_INET and AF_UNIX."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sockmap, vsock: Para sockets conectables, solo se permite que est\u00e9n conectados. Sockmap espera que todos los vsocks tengan un transporte asignado, lo cual se expresa en vsock_proto::psock_update_sk_prot(). Sin embargo, existe un caso extremo en el que un socket no conectado (conectable) puede perder su transporte previamente asignado. Esto se gestiona con una comprobaci\u00f3n de NULL en la ruta de recepci\u00f3n vsock/BPF. Otro detalle de dise\u00f1o es que los vsocks que escuchan no deben tener ning\u00fan transporte asignado. Esto implica que no son compatibles con sockmap. Sin embargo, esto se complica por el hecho de que un socket, antes de cambiar a TCP_LISTEN, puede haber tenido alg\u00fan transporte asignado durante un intento fallido de connect(). Por lo tanto, podemos terminar con un vsock escuchando en un sockmap, que explota r\u00e1pidamente: KASAN: null-ptr-deref en el rango [0x0000000000000120-0x0000000000000127] CPU: 7 UID: 0 PID: 56 Comm: kworker/7:0 No contaminado 6.14.0-rc1+ Cola de trabajo: vsock-loopback vsock_loopback_work RIP: 0010:vsock_read_skb+0x4b/0x90 Rastreo de llamadas: sk_psock_verdict_data_ready+0xa4/0x2e0 virtio_transport_recv_pkt+0x1ca8/0x2acc vsock_loopback_work+0x27d/0x3f0 Para los sockets conectables, en lugar de depender \u00fanicamente del estado de vsk->transport, indique a sockmap que solo permita los que representan conexiones establecidas. Esto coincide con el comportamiento de AF_INET y AF_UNIX."}], "id": "CVE-2025-21854", "lastModified": "2026-06-17T08:44:27.060", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-21854", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T19:26:04.052648Z", "version": "2.0.3"}}]}, "published": "2025-03-12T10:15:18.190", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22b683217ad2112791a708693cb236507abd637a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8fb5bb169d17cdd12c2dcc2e96830ed487d77a0f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cc9a7832ede53ade1ba9991f0e27314caa4029d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f7b473e35986835cc2813fef7b9d40336a09247e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: sockmap, vsock: For connectible sockets allow only connected", "id": "2351631", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2351631"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsockmap, vsock: For connectible sockets allow only connected\nsockmap expects all vsocks to have a transport assigned, which is expressed\nin vsock_proto::psock_update_sk_prot(). However, there is an edge case\nwhere an unconnected (connectible) socket may lose its previously assigned\ntransport. This is handled with a NULL check in the vsock/BPF recv path.\nAnother design detail is that listening vsocks are not supposed to have any\ntransport assigned at all. Which implies they are not supported by the\nsockmap. But this is complicated by the fact that a socket, before\nswitching to TCP_LISTEN, may have had some transport assigned during a\nfailed connect() attempt. Hence, we may end up with a listening vsock in a\nsockmap, which blows up quickly:\nKASAN: null-ptr-deref in range [0x0000000000000120-0x0000000000000127]\nCPU: 7 UID: 0 PID: 56 Comm: kworker/7:0 Not tainted 6.14.0-rc1+\nWorkqueue: vsock-loopback vsock_loopback_work\nRIP: 0010:vsock_read_skb+0x4b/0x90\nCall Trace:\nsk_psock_verdict_data_ready+0xa4/0x2e0\nvirtio_transport_recv_pkt+0x1ca8/0x2acc\nvsock_loopback_work+0x27d/0x3f0\nprocess_one_work+0x846/0x1420\nworker_thread+0x5b3/0xf80\nkthread+0x35a/0x700\nret_from_fork+0x2d/0x70\nret_from_fork_asm+0x1a/0x30\nFor connectible sockets, instead of relying solely on the state of\nvsk->transport, tell sockmap to only allow those representing established\nconnections. This aligns with the behaviour for AF_INET and AF_UNIX."], "name": "CVE-2025-21854", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-03-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21854\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21854\nhttps://lore.kernel.org/linux-cve-announce/2025031214-CVE-2025-21854-98fb@gregkh/T"], "threat_severity": "Moderate"}

{}