{"id":"CVE-2026-68141","title":"net/af_iucv: fix NULL deref in afiucv_hs_callback_syn()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/af_iucv: fix NULL deref in afiucv_hs_callback_syn()\n\nafiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC.\nIf the allocation fails, nsk is NULL.\n\nThe…","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","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 3881ac441f642d56503818123446f7298442236b < 6a1eb5b46c19073f8153b7e2c19b408cf353aaf1","Linux >= 3881ac441f642d56503818123446f7298442236b < c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953","Linux >= 3881ac441f642d56503818123446f7298442236b < 07e21deb3664001995e0a456dd627ab7dbe127ec","Linux >= 3881ac441f642d56503818123446f7298442236b < 8bb111f87ded6acb9837ec9b45d6f02cda94c51f","Linux >= 3881ac441f642d56503818123446f7298442236b < 46453b16f38ec7147351f7447e2aec6ea330f7b3","Linux >= 3881ac441f642d56503818123446f7298442236b < 33736ff5e7c97d3348ce812e8bd2e125d840743c","Linux >= 3881ac441f642d56503818123446f7298442236b < 0e857185591fe79934427c9c0c1c31dc776be134","Linux >= 3881ac441f642d56503818123446f7298442236b < 47a5116e56a6b6fe1e909f244e39cd0fc26ceee4","Linux 3.2"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T15:44:37.607380Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:52:59.437Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68141","references":[{"url":"https://git.kernel.org/stable/c/6a1eb5b46c19073f8153b7e2c19b408cf353aaf1"},{"url":"https://git.kernel.org/stable/c/c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953"},{"url":"https://git.kernel.org/stable/c/07e21deb3664001995e0a456dd627ab7dbe127ec"},{"url":"https://git.kernel.org/stable/c/8bb111f87ded6acb9837ec9b45d6f02cda94c51f"},{"url":"https://git.kernel.org/stable/c/46453b16f38ec7147351f7447e2aec6ea330f7b3"},{"url":"https://git.kernel.org/stable/c/33736ff5e7c97d3348ce812e8bd2e125d840743c"},{"url":"https://git.kernel.org/stable/c/0e857185591fe79934427c9c0c1c31dc776be134"},{"url":"https://git.kernel.org/stable/c/47a5116e56a6b6fe1e909f244e39cd0fc26ceee4"}],"tags":["cve.org"],"epss":0.00523,"epssPercentile":0.43128,"ingestedAt":"2026-10-16T17:24:46.844Z","slug":"CVE-2026-68141","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/af_iucv: fix NULL deref in afiucv_hs_callback_syn()\n\nafiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC.\nIf the allocation fails, nsk is NULL.\n\nThe connection-refused path is entered when the listen state check\nfails, the accept backlog is full, or nsk is NULL. The code\nunconditionally calls iucv_sock_kill(nsk) in that path.\n\niucv_sock_kill() does not accept a NULL socket pointer and immediately\ndereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL,\ncalling iucv_sock_kill(nsk) results in a NULL pointer dereference.\n\nOnly call iucv_sock_kill() when a child socket was successfully\nallocated.\n\n## Affected\n\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 6a1eb5b46c19073f8153b7e2c19b408cf353aaf1`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 07e21deb3664001995e0a456dd627ab7dbe127ec`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 8bb111f87ded6acb9837ec9b45d6f02cda94c51f`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 46453b16f38ec7147351f7447e2aec6ea330f7b3`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 33736ff5e7c97d3348ce812e8bd2e125d840743c`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 0e857185591fe79934427c9c0c1c31dc776be134`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 47a5116e56a6b6fe1e909f244e39cd0fc26ceee4`\n- `Linux 3.2`\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":[]}