{"id":"CVE-2026-68397","title":"net/iucv: take a reference on the socket found in afiucv_hs_rcv()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: take a reference on the socket found in afiucv_hs_rcv()\n\nafiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock,\ndrops the lock, and then pas…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 3881ac441f642d56503818123446f7298442236b < 5739be5c19495d709d902a2912c9102ce78740d5","Linux >= 3881ac441f642d56503818123446f7298442236b < bc6c6e546ffff8865daaeb622ef348c2d481e80f","Linux >= 3881ac441f642d56503818123446f7298442236b < e3e0679fc950191aff8f27fa78abcfc2462cff4a","Linux >= 3881ac441f642d56503818123446f7298442236b < 4dc0e63abf8bc7ba8892e617c1fb8b204361e022","Linux >= 3881ac441f642d56503818123446f7298442236b < 1801cb20a5025a787d6853e19c38db138344b4b4","Linux >= 3881ac441f642d56503818123446f7298442236b < c75a950e77356e526672cba4584080c6c8b793b6","Linux >= 3881ac441f642d56503818123446f7298442236b < 5595ea59cdf29182cf6a270cacc1426c57b603de","Linux >= 3881ac441f642d56503818123446f7298442236b < 4fa349156043dc119721d067329714179f501749","Linux 3.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:48:06.325018Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:11.580Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68397","references":[{"url":"https://git.kernel.org/stable/c/5739be5c19495d709d902a2912c9102ce78740d5"},{"url":"https://git.kernel.org/stable/c/bc6c6e546ffff8865daaeb622ef348c2d481e80f"},{"url":"https://git.kernel.org/stable/c/e3e0679fc950191aff8f27fa78abcfc2462cff4a"},{"url":"https://git.kernel.org/stable/c/4dc0e63abf8bc7ba8892e617c1fb8b204361e022"},{"url":"https://git.kernel.org/stable/c/1801cb20a5025a787d6853e19c38db138344b4b4"},{"url":"https://git.kernel.org/stable/c/c75a950e77356e526672cba4584080c6c8b793b6"},{"url":"https://git.kernel.org/stable/c/5595ea59cdf29182cf6a270cacc1426c57b603de"},{"url":"https://git.kernel.org/stable/c/4fa349156043dc119721d067329714179f501749"}],"tags":["cve.org"],"epss":0.00262,"epssPercentile":0.1684,"ingestedAt":"2026-10-16T17:24:46.863Z","slug":"CVE-2026-68397","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: take a reference on the socket found in afiucv_hs_rcv()\n\nafiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock,\ndrops the lock, and then passes the socket to the afiucv_hs_callback_*()\nhandlers without holding a reference. AF_IUCV sockets are not\nRCU-protected and are freed synchronously by iucv_sock_kill() ->\nsock_put(), so a concurrent close can free the socket in the window\nbetween read_unlock() and the handler, which then dereferences freed\nmemory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()).\n\nTake a reference with sock_hold() while the socket is still on the list\nand release it with sock_put() once the handler has run.\n\n## Affected\n\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 5739be5c19495d709d902a2912c9102ce78740d5`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < bc6c6e546ffff8865daaeb622ef348c2d481e80f`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < e3e0679fc950191aff8f27fa78abcfc2462cff4a`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 4dc0e63abf8bc7ba8892e617c1fb8b204361e022`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 1801cb20a5025a787d6853e19c38db138344b4b4`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < c75a950e77356e526672cba4584080c6c8b793b6`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 5595ea59cdf29182cf6a270cacc1426c57b603de`\n- `Linux >= 3881ac441f642d56503818123446f7298442236b < 4fa349156043dc119721d067329714179f501749`\n- `Linux 3.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}