{"id":"CVE-2026-74282","title":"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_una…","summary":"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_una…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 10724cc7bb7832b482df049c20fd824d928c5eaa < 3388145d258cf2c4c98278e3987296007d30672e","Linux >= 10724cc7bb7832b482df049c20fd824d928c5eaa < 67e55b054bf8025658dc0e255057f2a6236416bd","Linux >= 10724cc7bb7832b482df049c20fd824d928c5eaa < 96f91b8ae1a489b3eca137e7acf42cf985fb8939","Linux >= 10724cc7bb7832b482df049c20fd824d928c5eaa < 47ed873e4ceda34098bd46d8e96b4bb13cad3a04","Linux >= 10724cc7bb7832b482df049c20fd824d928c5eaa < b44bebdd32c9ff66ee2aebfc317ced44bedd9335","Linux >= 10724cc7bb7832b482df049c20fd824d928c5eaa < 3cfa3d8e0dc167850edeb5bf5a07757db83fd54e","Linux >= 10724cc7bb7832b482df049c20fd824d928c5eaa < 1e2c956745777e6ffdee7f30da5935741c03ee1e","Linux >= 10724cc7bb7832b482df049c20fd824d928c5eaa < ab3e10b44ba5411779aac7afd2477917dd77750f","Linux 4.7"],"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:17:36.170","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74282","references":[{"url":"https://git.kernel.org/stable/c/1e2c956745777e6ffdee7f30da5935741c03ee1e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3388145d258cf2c4c98278e3987296007d30672e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3cfa3d8e0dc167850edeb5bf5a07757db83fd54e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/47ed873e4ceda34098bd46d8e96b4bb13cad3a04","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/67e55b054bf8025658dc0e255057f2a6236416bd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/96f91b8ae1a489b3eca137e7acf42cf985fb8939","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ab3e10b44ba5411779aac7afd2477917dd77750f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b44bebdd32c9ff66ee2aebfc317ced44bedd9335","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00696,"epssPercentile":0.52817,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T18:52:07.516475Z"},"ingestedAt":"2026-10-16T19:46:24.385Z","slug":"CVE-2026-74282","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}