{"id":"CVE-2026-74282","revision":null,"records":[{"revision":"5fb2f3c195e445a2ba923bff42cd4922","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74282","aliases":[],"title":"tipc: prevent snt_unacked underflow on CONN_ACK","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: prevent snt_unacked underflow on CONN_ACK\n\ntipc_sk_conn_proto_rcv() subtracts the peer-supplied connection ack count\nfrom the unsigned 16-bit send counter snt_unacked without checking that it\ndoes not exceed the number of messages actually outstanding:\n\n\ttsk->snt_unacked -= msg_conn_ack(hdr);\n\nmsg_conn_ack() is read straight from a received CONN_MANAGER/CONN_ACK\nmessage. If the ack count is larger than snt_unacked, the subtraction\nwraps to a near-maximum value, leaving tsk_conn_cong() permanently true\nand starving the connection of further transmits.\n\nValidate the ACK count at the start of the CONN_ACK block and drop the\nmessage if it acknowledges more messages than are outstanding. A peer (or,\nfor a local connection, the connected peer socket) can otherwise wedge a\nTIPC connection's send side by sending an oversized connection ack.","state":0,"publishedAt":"2026-08-15T05:57:52.048+00:00","modifiedAt":"2026-10-16T18:55:29.895+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/tipc/socket.c\"\n ],\n \"versions\": [\n {\n \"version\": \"10724cc7bb7832b482df049c20fd824d928c5eaa\",\n \"lessThan\": \"3388145d258cf2c4c98278e3987296007d30672e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"10724cc7bb7832b482df049c20fd824d928c5eaa\",\n \"lessThan\": \"67e55b054bf8025658dc0e255057f2a6236416bd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"10724cc7bb7832b482df049c20fd824d928c5eaa\",\n \"lessThan\": \"96f91b8ae1a489b3eca137e7acf42cf985fb8939\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"10724cc7bb7832b482df049c20fd824d928c5eaa\",\n \"lessThan\": \"47ed873e4ceda34098bd46d8e96b4bb13cad3a04\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"10724cc7bb7832b482df049c20fd824d928c5eaa\",\n \"lessThan\": \"b44bebdd32c9ff66ee2aebfc317ced44bedd9335\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"10724cc7bb7832b482df049c20fd824d928c5eaa\",\n \"lessThan\": \"3cfa3d8e0dc167850edeb5bf5a07757db83fd54e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"10724cc7bb7832b482df049c20fd824d928c5eaa\",\n \"lessThan\": \"1e2c956745777e6ffdee7f30da5935741c03ee1e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"10724cc7bb7832b482df049c20fd824d928c5eaa\",\n \"lessThan\": \"ab3e10b44ba5411779aac7afd2477917dd77750f\",\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/tipc/socket.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.7\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.7\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.261\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3388145d258cf2c4c98278e3987296007d30672e","https://git.kernel.org/stable/c/67e55b054bf8025658dc0e255057f2a6236416bd","https://git.kernel.org/stable/c/96f91b8ae1a489b3eca137e7acf42cf985fb8939","https://git.kernel.org/stable/c/47ed873e4ceda34098bd46d8e96b4bb13cad3a04","https://git.kernel.org/stable/c/b44bebdd32c9ff66ee2aebfc317ced44bedd9335","https://git.kernel.org/stable/c/3cfa3d8e0dc167850edeb5bf5a07757db83fd54e","https://git.kernel.org/stable/c/1e2c956745777e6ffdee7f30da5935741c03ee1e","https://git.kernel.org/stable/c/ab3e10b44ba5411779aac7afd2477917dd77750f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74282","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74282","identifiers":["CVE-2026-74282"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-106f5a07b4874523a1df5d20ed41f7cc","complete":false,"records":13654,"lastAttemptAt":"2026-11-09T09:08:23.8717611+00:00","lastSuccessAt":"2026-11-09T09:08:23.930182+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:08:23.930182+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T09:04:02.9162191+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T09:04:02.9162191+00:00","lastSuccessAt":"2026-11-09T09:04:03.197028+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:03.1970284+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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