{"id":"CVE-2026-74736","title":"net/sched: cls_bpf: reject dev-bound programs bound to a different device","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_bpf: reject dev-bound programs bound to a different device\n\ncls_bpf_prog_from_efd() obtained a SCHED_CLS program via\nbpf_prog_get_type_dev() but never ve…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < ec5a552f4b2d841c6c021752450716e1a9676661","Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < daf546ab5763ce6a18280cb4db060e836c515301","Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < adb3e7c26a51a10d94a241c6de7a81a2863dcacf","Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e","Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < 120977e2c096deea4e866e4273be9220b957c29e","Linux 6.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T19:15:56.417878Z"},"published":"2026-08-26","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:16:12.701Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74736","references":[{"url":"https://git.kernel.org/stable/c/ec5a552f4b2d841c6c021752450716e1a9676661"},{"url":"https://git.kernel.org/stable/c/daf546ab5763ce6a18280cb4db060e836c515301"},{"url":"https://git.kernel.org/stable/c/adb3e7c26a51a10d94a241c6de7a81a2863dcacf"},{"url":"https://git.kernel.org/stable/c/5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e"},{"url":"https://git.kernel.org/stable/c/120977e2c096deea4e866e4273be9220b957c29e"}],"tags":["cve.org"],"epss":0.00138,"epssPercentile":0.02841,"ingestedAt":"2026-10-16T19:46:24.328Z","slug":"CVE-2026-74736","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_bpf: reject dev-bound programs bound to a different device\n\ncls_bpf_prog_from_efd() obtained a SCHED_CLS program via\nbpf_prog_get_type_dev() but never verified that a device-bound (offloaded)\nprogram's bound netdev matches the TC netdev the classifier is being\nattached to. This let a program loaded with prog_ifindex for device A be\nattached via cls_bpf + skip_sw to device B; deleting device A then\ndestroyed the program's offload state while it was still attached to\ndevice B, triggering a netdevsim WARN (panic with panic_on_warn=1).\n\nMirror the XDP attach path (net/core/dev.c) and reject the attach with\n-EINVAL when a dev-bound program's bound device does not match the\ntarget device.\n\n## Affected\n\n- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < ec5a552f4b2d841c6c021752450716e1a9676661`\n- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < daf546ab5763ce6a18280cb4db060e836c515301`\n- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < adb3e7c26a51a10d94a241c6de7a81a2863dcacf`\n- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e`\n- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < 120977e2c096deea4e866e4273be9220b957c29e`\n- `Linux 6.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}