CVE-2022-49814

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However, kcm_recvmsg() still only grabs the skb queue\nlock, so race conditions still exist.\n\nWe can teach kcm_recvmsg() to grab mux->rx_lock too but this would\nintroduce a potential performance regression as struct kcm_mux can\nbe shared by multiple KCM sockets.\n\nSo we have to enforce skb queue lock in requeue_rx_msgs() and handle\nskb peek case carefully in kcm_wait_data(). Fortunately,\nskb_recv_datagram() already handles it nicely and is widely used by\nother sockets, we can just switch to skb_recv_datagram() after\ngetting rid of the unnecessary sock lock in kcm_recvmsg() and\nkcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,\nso it is safe to get rid of this check too.\n\nI ran the original syzbot reproducer for 30 min without seeing any\nissue."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - The race is triggered only via local AF_KCM syscalls (socket, SIOCKCMATTACH/CLONE, setsockopt KCM_RECV_DISABLE/close, and recvmsg/recvmmsg); remote TCP data may fill the queue but cannot alone exercise the unlocked requeue versus recvmsg window.\nAC:L - The attacker controls both sides of the race\u2014one thread in kcm_recvmsg while another drives requeue_rx_msgs via KCM_RECV_DISABLE, close/kcm_done, or mux RX paths on sockets they created\u2014and can retry indefinitely; syzbot reproduced a GPF in skb_unlink with a C repro.\nPR:L - net/kcm/ has no capable()/CAP_NET_ADMIN checks; AF_KCM autoloads via MODULE_ALIAS_NETPROTO(PF_KCM), and an unprivileged user can create KCM sockets, attach their own TCP socket with a SOCKET_FILTER, and trigger the race (same PR:L posture as CVE-2025-38717).\nUI:N - The attacker performs socket setup, attach/clone, concurrent recvmsg and disable/close entirely themselves; no victim action is required.\nS:U - This is a standard in-kernel sk_buff heap use-after-free within the host kernel authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The race leaves recvmsg holding a pointer to an sk_buff already dequeued/freed by requeue_rx_msgs, a reclaimable heap UAF that enables arbitrary kernel read via spray/reuse of the freed skb.\nI:H - Concurrent unlocked unlink/dequeue corrupts the receive-queue list and can double-free the skb, giving a heap write/control-flow primitive consistent with treating exploitable kernel UAFs as High integrity.\nA:H - Even without full exploitation, the bug causes a general protection fault/oops in skb_unlink from kcm_recvmsg (as demonstrated by syzbot), which is a full kernel availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/kcm/kcmsock.c"], "versions": [{"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3", "lessThan": "22f6b5d47396b4287662668ee3f5c1f766cb4259", "status": "affected", "versionType": "git"}, {"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3", "lessThan": "d9ad4de92e184b19bcae4da10dac0275abf83931", "status": "affected", "versionType": "git"}, {"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3", "lessThan": "ce57d6474ae999a3b2d442314087473a646a65c7", "status": "affected", "versionType": "git"}, {"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3", "lessThan": "4154b6afa2bd639214ff259d912faad984f7413a", "status": "affected", "versionType": "git"}, {"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3", "lessThan": "f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3", "status": "affected", "versionType": "git"}, {"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3", "lessThan": "bf92e54597d842da127c59833b365d6faeeaf020", "status": "affected", "versionType": "git"}, {"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3", "lessThan": "5121197ecc5db58c07da95eb1ff82b98b121a221", "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/kcm/kcmsock.c"], "versions": [{"version": "4.6", "status": "affected"}, {"version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.300", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.267", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.225", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.156", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.80", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.10", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "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": "4.6", "versionEndExcluding": "4.14.300"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "4.19.267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.4.225"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.10.156"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.15.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259"}, {"url": "https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931"}, {"url": "https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7"}, {"url": "https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413a"}, {"url": "https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3"}, {"url": "https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020"}, {"url": "https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221"}], "title": "kcm: close race conditions on sk_receive_queue", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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However, kcm_recvmsg() still only grabs the skb queue\nlock, so race conditions still exist.\n\nWe can teach kcm_recvmsg() to grab mux->rx_lock too but this would\nintroduce a potential performance regression as struct kcm_mux can\nbe shared by multiple KCM sockets.\n\nSo we have to enforce skb queue lock in requeue_rx_msgs() and handle\nskb peek case carefully in kcm_wait_data(). Fortunately,\nskb_recv_datagram() already handles it nicely and is widely used by\nother sockets, we can just switch to skb_recv_datagram() after\ngetting rid of the unnecessary sock lock in kcm_recvmsg() and\nkcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,\nso it is safe to get rid of this check too.\n\nI ran the original syzbot reproducer for 30 min without seeing any\nissue."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: kcm: condiciones de ejecuci\u00f3n cerradas en sk_receive_queue. sk->sk_receive_queue est\u00e1 protegido por el bloqueo de cola skb, pero para los sockets KCM su ruta RX toma mux->rx_lock para proteger m\u00e1s que solo la cola skb. Sin embargo, kcm_recvmsg() todav\u00eda solo captura el bloqueo de cola skb, por lo que las condiciones de ejecuci\u00f3n a\u00fan existen. Podemos ense\u00f1ar a kcm_recvmsg() a capturar tambi\u00e9n mux->rx_lock, pero esto introducir\u00eda una posible regresi\u00f3n del rendimiento, ya que la estructura kcm_mux puede ser compartida por varios sockets KCM. Por lo tanto, debemos aplicar el bloqueo de cola skb en requeue_rx_msgs() y manejar el caso de skb peek con cuidado en kcm_wait_data(). Afortunadamente, skb_recv_datagram() ya lo gestiona correctamente y es ampliamente utilizado por otros sockets. Podemos cambiar a skb_recv_datagram() tras eliminar el bloqueo de sock innecesario en kcm_recvmsg() y kcm_splice_read(). Nota: Los sockets KCM no utilizan SOCK_DONE, por lo que tambi\u00e9n es seguro omitir esta comprobaci\u00f3n. Ejecut\u00e9 el reproductor syzbot original durante 30 minutos sin observar ning\u00fan problema."}], "id": "CVE-2022-49814", "lastModified": "2026-08-04T10:17:56.803", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-05-01T15:16:04.787", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: kcm: close race conditions on sk_receive_queue", "id": "2363522", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363522"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nkcm: close race conditions on sk_receive_queue\nsk->sk_receive_queue is protected by skb queue lock, but for KCM\nsockets its RX path takes mux->rx_lock to protect more than just\nskb queue. However, kcm_recvmsg() still only grabs the skb queue\nlock, so race conditions still exist.\nWe can teach kcm_recvmsg() to grab mux->rx_lock too but this would\nintroduce a potential performance regression as struct kcm_mux can\nbe shared by multiple KCM sockets.\nSo we have to enforce skb queue lock in requeue_rx_msgs() and handle\nskb peek case carefully in kcm_wait_data(). Fortunately,\nskb_recv_datagram() already handles it nicely and is widely used by\nother sockets, we can just switch to skb_recv_datagram() after\ngetting rid of the unnecessary sock lock in kcm_recvmsg() and\nkcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,\nso it is safe to get rid of this check too.\nI ran the original syzbot reproducer for 30 min without seeing any\nissue."], "name": "CVE-2022-49814", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49814\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49814\nhttps://lore.kernel.org/linux-cve-announce/2025050131-CVE-2022-49814-2f30@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:01:14.027245+00:00", "updated": "2025-07-12T22:01:14.027291+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}