{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68386", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.388Z", "datePublished": "2026-08-10T12:04:05.306Z", "dateUpdated": "2026-08-10T12:04:05.306Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-10T12:04:05.306Z"}, "descriptions": [{"lang": "en", "value": "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\")."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/sock_map.c"], "versions": [{"version": "0c48eefae712c2fd91480346a07a1a9cd0f9470b", "lessThan": "7ffe529e7127411806c8692fb1490f552c629dc2", "status": "affected", "versionType": "git"}, {"version": "0c48eefae712c2fd91480346a07a1a9cd0f9470b", "lessThan": "17b7ef6b86112a4e61cee1e9009a4b318e3225c5", "status": "affected", "versionType": "git"}, {"version": "0c48eefae712c2fd91480346a07a1a9cd0f9470b", "lessThan": "250474c69bc3fc48a5fc21d7c349f279caad947a", "status": "affected", "versionType": "git"}, {"version": "0c48eefae712c2fd91480346a07a1a9cd0f9470b", "lessThan": "8692655da369961128658cf8539334b6a960ecb0", "status": "affected", "versionType": "git"}, {"version": "0c48eefae712c2fd91480346a07a1a9cd0f9470b", "lessThan": "66efd3368ae10d05e08fbe6425b50fdec7186ac7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/sock_map.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2-rc4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7ffe529e7127411806c8692fb1490f552c629dc2"}, {"url": "https://git.kernel.org/stable/c/17b7ef6b86112a4e61cee1e9009a4b318e3225c5"}, {"url": "https://git.kernel.org/stable/c/250474c69bc3fc48a5fc21d7c349f279caad947a"}, {"url": "https://git.kernel.org/stable/c/8692655da369961128658cf8539334b6a960ecb0"}, {"url": "https://git.kernel.org/stable/c/66efd3368ae10d05e08fbe6425b50fdec7186ac7"}], "title": "bpf, sockmap: Reject unhashed UDP sockets on sockmap update", "x_generator": {"engine": "bippy-1.2.0"}}}}

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