{"id":"CVE-2026-74282","revision":"5fb2f3c195e445a2ba923bff42cd4922","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":[]}