CVE-2025-37756

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I have a vague\nrecollection of Eric pointing this out to us a long time ago.\nSupporting disconnect is really hard, for one thing if offload\nis enabled we'd need to wait for all packets to be _acked_.\nDisconnect is not commonly used, disallow it.\n\nThe immediate problem syzbot run into is the warning in the strp,\nbut that's just the easiest bug to trigger:\n\n WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n Call Trace:\n <TASK>\n tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363\n tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043\n inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678\n sock_recvmsg_nosec net/socket.c:1023 [inline]\n sock_recvmsg+0x109/0x280 net/socket.c:1045\n __sys_recvfrom+0x202/0x380 net/socket.c:2237"}], "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 vulnerability is triggered by the socket owner issuing `connect(fd, AF_UNSPEC)` followed by `recvmsg()` on their own kTLS socket; a remote TLS peer has no way to induce a disconnect. The TCP connection can be entirely loopback, so no network access is needed at all.\nAC:L - The sequence (attach TLS ULP, receive one record so the strparser latches `msg_ready` with a borrowed `frag_list`, disconnect, recvmsg) is fully under the attacker's control, single-threaded, and deterministic with no race to win. Heap grooming of the freed `skbuff_head` objects is standard and repeatable since the attacker can retry indefinitely.\nPR:L - `net/tls` contains no `capable()`/`ns_capable()` checks whatsoever, and `setsockopt(TCP_ULP,\"tls\")` plus `TLS_RX` crypto_info are available to any unprivileged user once the tls module is built in or resident. All steps are ordinary socket syscalls on a socket the attacker created.\nUI:N - The attacker performs every step themselves within a single process; no victim action, mount, or file open is involved.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - `skb_nsg()`/`skb_to_sgvec()` walk the anchor's dangling `frag_list` into freed `skbuff_head` slab objects, building a scatterlist from attacker-sprayable page pointers; the zero-copy AEAD then writes those kernel bytes into the user's buffer before the tag check fails, and since the attacker chose the RX key/IV they recover the plaintext \u2014 an arbitrary kernel memory read.\nI:H - This is a use-after-free: `tls_strp_msg_hold()` performs `skb_clone()` on freed skbs (refcount writes into reallocated slab memory) and queues clones that are later freed, giving heap corruption and arbitrary-free primitives usable for control-flow hijack.\nA:H - The immediate observable effect is the `WARN_ON` at net/tls/tls_strp.c:486 (a panic under `panic_on_warn`), and the subsequent dereference of freed skb metadata and wild page pointers reliably oopses the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tls/tls_main.c"], "versions": [{"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf", "status": "affected", "versionType": "git"}, {"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "ac91c6125468be720eafde9c973994cb45b61d44", "status": "affected", "versionType": "git"}, {"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "f3ce4d3f874ab7919edca364c147ac735f9f1d04", "status": "affected", "versionType": "git"}, {"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "2bcad8fefcecdd5f005d8c550b25d703c063c34a", "status": "affected", "versionType": "git"}, {"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "9fcbca0f801580cbb583e9cb274e2c7fbe766ca6", "status": "affected", "versionType": "git"}, {"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "c665bef891e8972e1d3ce5bbc0d42a373346a2c3", "status": "affected", "versionType": "git"}, {"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "8513411ec321942bd3cfed53d5bb700665c67d86", "status": "affected", "versionType": "git"}, {"version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "5071a1e606b30c0c11278d3c6620cd6a24724cf6", "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/tls/tls_main.c"], "versions": [{"version": "4.13", "status": "affected"}, {"version": "0", "lessThan": "4.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.237", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.181", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.135", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.88", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.24", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.12", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.3", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": 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"6.14.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf"}, {"url": "https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44"}, {"url": "https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04"}, {"url": "https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a"}, {"url": "https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6"}, {"url": "https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3"}, {"url": "https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86"}, {"url": "https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6"}], "title": "net: tls: explicitly disallow disconnect", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/07/1"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-05-07T06:58:56.863Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-37756", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:44:56.970467Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:51:59.284Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/07/1"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-05-07T06:58:56.863Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-37756", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:44:56.970467Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:44:57.588Z"}}], "cna": {"title": "net: tls: explicitly disallow disconnect", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is triggered by the socket owner issuing `connect(fd, AF_UNSPEC)` followed by `recvmsg()` on their own kTLS socket; a remote TLS peer has no way to induce a disconnect. The TCP connection can be entirely loopback, so no network access is needed at all.\nAC:L - The sequence (attach TLS ULP, receive one record so the strparser latches `msg_ready` with a borrowed `frag_list`, disconnect, recvmsg) is fully under the attacker's control, single-threaded, and deterministic with no race to win. Heap grooming of the freed `skbuff_head` objects is standard and repeatable since the attacker can retry indefinitely.\nPR:L - `net/tls` contains no `capable()`/`ns_capable()` checks whatsoever, and `setsockopt(TCP_ULP,\"tls\")` plus `TLS_RX` crypto_info are available to any unprivileged user once the tls module is built in or resident. All steps are ordinary socket syscalls on a socket the attacker created.\nUI:N - The attacker performs every step themselves within a single process; no victim action, mount, or file open is involved.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - `skb_nsg()`/`skb_to_sgvec()` walk the anchor's dangling `frag_list` into freed `skbuff_head` slab objects, building a scatterlist from attacker-sprayable page pointers; the zero-copy AEAD then writes those kernel bytes into the user's buffer before the tag check fails, and since the attacker chose the RX key/IV they recover the plaintext \u2014 an arbitrary kernel memory read.\nI:H - This is a use-after-free: `tls_strp_msg_hold()` performs `skb_clone()` on freed skbs (refcount writes into reallocated slab memory) and queues clones that are later freed, giving heap corruption and arbitrary-free primitives usable for control-flow hijack.\nA:H - The immediate observable effect is the `WARN_ON` at net/tls/tls_strp.c:486 (a panic under `panic_on_warn`), and the subsequent dereference of freed skb metadata and wild page pointers reliably oopses the kernel."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf", "versionType": "git"}, {"status": "affected", "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "ac91c6125468be720eafde9c973994cb45b61d44", "versionType": "git"}, {"status": "affected", "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "f3ce4d3f874ab7919edca364c147ac735f9f1d04", "versionType": "git"}, {"status": "affected", "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "2bcad8fefcecdd5f005d8c550b25d703c063c34a", "versionType": "git"}, {"status": "affected", "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "9fcbca0f801580cbb583e9cb274e2c7fbe766ca6", "versionType": "git"}, {"status": "affected", "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "c665bef891e8972e1d3ce5bbc0d42a373346a2c3", "versionType": "git"}, {"status": "affected", "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "8513411ec321942bd3cfed53d5bb700665c67d86", "versionType": "git"}, {"status": "affected", "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218", "lessThan": "5071a1e606b30c0c11278d3c6620cd6a24724cf6", "versionType": "git"}], "programFiles": ["net/tls/tls_main.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.13"}, {"status": "unaffected", "version": "0", "lessThan": "4.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.237", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.181", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.135", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.88", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.24", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13.12", "versionType": "semver", "lessThanOrEqual": "6.13.*"}, {"status": "unaffected", "version": "6.14.3", "versionType": "semver", "lessThanOrEqual": "6.14.*"}, {"status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/tls/tls_main.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf"}, {"url": "https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44"}, {"url": "https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04"}, {"url": "https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a"}, {"url": "https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6"}, {"url": "https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3"}, {"url": "https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86"}, {"url": "https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: explicitly disallow disconnect\n\nsyzbot discovered that it can disconnect a TLS socket and then\nrun into all sort of unexpected corner cases. I have a vague\nrecollection of Eric pointing this out to us a long time ago.\nSupporting disconnect is really hard, for one thing if offload\nis enabled we'd need to wait for all packets to be _acked_.\nDisconnect is not commonly used, disallow it.\n\nThe immediate problem syzbot run into is the warning in the strp,\nbut that's just the easiest bug to trigger:\n\n WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n Call Trace:\n <TASK>\n tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363\n tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043\n inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678\n sock_recvmsg_nosec net/socket.c:1023 [inline]\n sock_recvmsg+0x109/0x280 net/socket.c:1045\n __sys_recvfrom+0x202/0x380 net/socket.c:2237"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.237", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.181", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.135", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.88", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.24", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13.12", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.14.3", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.15", "versionStartIncluding": "4.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:57:19.159Z"}}}, "cveMetadata": {"cveId": "CVE-2025-37756", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:51:59.284Z", "dateReserved": "2025-04-16T04:51:23.938Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-05-01T12:56:00.539Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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I have a vague\nrecollection of Eric pointing this out to us a long time ago.\nSupporting disconnect is really hard, for one thing if offload\nis enabled we'd need to wait for all packets to be _acked_.\nDisconnect is not commonly used, disallow it.\n\nThe immediate problem syzbot run into is the warning in the strp,\nbut that's just the easiest bug to trigger:\n\n WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n Call Trace:\n <TASK>\n tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363\n tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043\n inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678\n sock_recvmsg_nosec net/socket.c:1023 [inline]\n sock_recvmsg+0x109/0x280 net/socket.c:1045\n __sys_recvfrom+0x202/0x380 net/socket.c:2237"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: tls: expl\u00edcitamente deshabilitar la desconexi\u00f3n. syzbot descubri\u00f3 que puede desconectar un socket TLS y luego encontrarse con todo tipo de casos inesperados. Recuerdo vagamente que Eric nos lo se\u00f1al\u00f3 hace mucho tiempo. Admitir la desconexi\u00f3n es muy dif\u00edcil; por ejemplo, si la descarga est\u00e1 habilitada, tendr\u00edamos que esperar a que se ackearan todos los paquetes. La desconexi\u00f3n no se usa com\u00fanmente; deshabilitarla. El problema inmediato con el que se encuentra syzbot es la advertencia en el strp, pero ese es simplemente el error m\u00e1s f\u00e1cil de activar: ADVERTENCIA: CPU: 0 PID: 5834 en net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 Rastreo de llamada: tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363 tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043 inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678 sock_recvmsg_nosec net/socket.c:1023 [en l\u00ednea] sock_recvmsg+0x109/0x280 net/socket.c:1045 __sys_recvfrom+0x202/0x380 net/socket.c:2237"}], "id": "CVE-2025-37756", "lastModified": "2026-10-15T22:18:17.173", "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": "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-37756", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:44:56.970467Z", "version": "2.0.3"}}]}, "published": "2025-05-01T13:15:54.370", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/05/07/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: tls: explicitly disallow disconnect", "id": "2363326", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363326"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: tls: explicitly disallow disconnect\nsyzbot discovered that it can disconnect a TLS socket and then\nrun into all sort of unexpected corner cases. I have a vague\nrecollection of Eric pointing this out to us a long time ago.\nSupporting disconnect is really hard, for one thing if offload\nis enabled we'd need to wait for all packets to be _acked_.\nDisconnect is not commonly used, disallow it.\nThe immediate problem syzbot run into is the warning in the strp,\nbut that's just the easiest bug to trigger:\nWARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\nRIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\nCall Trace:\n<TASK>\ntls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363\ntls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043\ninet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678\nsock_recvmsg_nosec net/socket.c:1023 [inline]\nsock_recvmsg+0x109/0x280 net/socket.c:1045\n__sys_recvfrom+0x202/0x380 net/socket.c:2237"], "name": "CVE-2025-37756", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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-2025-37756\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37756\nhttps://lore.kernel.org/linux-cve-announce/2025050139-CVE-2025-37756-a06e@gregkh/T"], "threat_severity": "Low"}

{}