{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"2271276ac5279d2d204be7739a1a28d4ef6cf608","status":"affected","version":"0c48eefae712c2fd91480346a07a1a9cd0f9470b","versionType":"git"},{"lessThan":"7ffe529e7127411806c8692fb1490f552c629dc2","status":"affected","version":"0c48eefae712c2fd91480346a07a1a9cd0f9470b","versionType":"git"},{"lessThan":"17b7ef6b86112a4e61cee1e9009a4b318e3225c5","status":"affected","version":"0c48eefae712c2fd91480346a07a1a9cd0f9470b","versionType":"git"},{"lessThan":"250474c69bc3fc48a5fc21d7c349f279caad947a","status":"affected","version":"0c48eefae712c2fd91480346a07a1a9cd0f9470b","versionType":"git"},{"lessThan":"8692655da369961128658cf8539334b6a960ecb0","status":"affected","version":"0c48eefae712c2fd91480346a07a1a9cd0f9470b","versionType":"git"},{"lessThan":"66efd3368ae10d05e08fbe6425b50fdec7186ac7","status":"affected","version":"0c48eefae712c2fd91480346a07a1a9cd0f9470b","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.101","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cveId":"CVE-2026-68386","cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Reject unhashed UDP sockets on sockmap update\n\nUDP sockets get SOCK_RCU_FREE set when (auto-)bound. This means\nsk_is_refcounted(unbound) = true, while sk_is_refcounted(bound) = false.\n\nBecause sockmap accepts unbound UDP sockets, a BPF program can increment a\nsocket's refcount via lookup. If the socket is subsequently bound, the\ntransition from unbound to bound causes bpf_sk_release() to skip the\ndecrement of the refcount, causing a memory leak.\n\nunreferenced object 0xffff88810bc2eb40 (size 1984):\n  comm \"test_progs\", pid 2451, jiffies 4295320596\n  hex dump (first 32 bytes):\n    7f 00 00 01 7f 00 00 01 d2 04 1b b7 04 d2 00 00  ................\n    02 00 01 40 00 00 00 00 00 00 00 00 00 00 00 00  ...@............\n  backtrace (crc bdee079d):\n    kmem_cache_alloc_noprof+0x557/0x660\n    sk_prot_alloc+0x69/0x240\n    sk_alloc+0x30/0x460\n    inet_create+0x2ce/0xf80\n    __sock_create+0x25b/0x5c0\n    __sys_socket+0x119/0x1d0\n    __x64_sys_socket+0x72/0xd0\n    do_syscall_64+0xa1/0x5f0\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nInstead of special-casing for refcounted sockets, reject unhashed UDP\nsockets during sockmap updates, as there is no benefit to supporting those.\nThis effectively reverts the commit under Fixes, with two exceptions:\n\n1. sock_map_sk_state_allowed() maintains a fall-through `return true`.\n2. In the spirit of commit b8b8315e39ff (\"bpf, sockmap: Remove unhash\n   handler for BPF sockmap usage\"), the proto::unhash BPF handler is not\n   reintroduced.\n\nHistorical note: this issue is related to commit 67312adc96b5 (\"bpf: reject\nunhashed sockets in bpf_sk_assign\").","epss":{"date":"2026-11-06","percentile":0.11439,"score":0.00211},"exploits":[],"kev":null,"metrics":[],"modifiedAt":1793985571233,"publishedAt":1786363445306,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/2271276ac5279d2d204be7739a1a28d4ef6cf608"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/7ffe529e7127411806c8692fb1490f552c629dc2"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/17b7ef6b86112a4e61cee1e9009a4b318e3225c5"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/250474c69bc3fc48a5fc21d7c349f279caad947a"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/8692655da369961128658cf8539334b6a960ecb0"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/66efd3368ae10d05e08fbe6425b50fdec7186ac7"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/17b7ef6b86112a4e61cee1e9009a4b318e3225c5"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/2271276ac5279d2d204be7739a1a28d4ef6cf608"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/250474c69bc3fc48a5fc21d7c349f279caad947a"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/66efd3368ae10d05e08fbe6425b50fdec7186ac7"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/7ffe529e7127411806c8692fb1490f552c629dc2"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/8692655da369961128658cf8539334b6a960ecb0"}],"remediation":[],"revision":"4436a18b711329defcf97b89c8fbb060cb9e623343c0935bb8a187be6b3852e5","sources":[{"modifiedAt":1793984115101,"name":"CNA: Linux","retrievedAt":1793985986680,"url":"https://www.cve.org/CVERecord?id=CVE-2026-68386"},{"modifiedAt":1793985571233,"name":"NVD","retrievedAt":1793989639396,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68386"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793985992670,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-68386"}],"ssvc":{"assessedAt":1793983708442,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"bpf, sockmap: Reject unhashed UDP sockets on sockmap update","updatedAt":1793989639396}