{"id":"CVE-2025-37756","revision":"5fb7ab01f9484657abd2bd2fe314bade","records":[{"revision":"5fb7ab01f9484657abd2bd2fe314bade","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-37756","aliases":[],"title":"net: tls: explicitly disallow disconnect","description":"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 \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","state":0,"publishedAt":"2025-05-01T12:56:00.539+00:00","modifiedAt":"2026-10-15T21:51:59.284+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/tls/tls_main.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\n \"lessThan\": \"7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\n \"lessThan\": \"ac91c6125468be720eafde9c973994cb45b61d44\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\n \"lessThan\": \"f3ce4d3f874ab7919edca364c147ac735f9f1d04\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\n \"lessThan\": \"2bcad8fefcecdd5f005d8c550b25d703c063c34a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\n \"lessThan\": \"9fcbca0f801580cbb583e9cb274e2c7fbe766ca6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\n \"lessThan\": \"c665bef891e8972e1d3ce5bbc0d42a373346a2c3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\n \"lessThan\": \"8513411ec321942bd3cfed53d5bb700665c67d86\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\n \"lessThan\": \"5071a1e606b30c0c11278d3c6620cd6a24724cf6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/tls/tls_main.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.13\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.13\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.237\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.181\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.135\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.88\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.24\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.13.12\",\n \"lessThanOrEqual\": \"6.13.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.14.3\",\n \"lessThanOrEqual\": \"6.14.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.15\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf","https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44","https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04","https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a","https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6","https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3","https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86","https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-37756","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-37756","identifiers":["CVE-2025-37756"]},"retained":false,"historicalAffected":[]}],"coverage":[]}