{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68399","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-30T09:28:09.389Z","datePublished":"2026-08-10T12:04:18.837Z","dateUpdated":"2026-08-17T05:04:47.842Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:04:47.842Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix UAF in sock clone early bailouts\n\nSimilar to recent commit 9b51a6155d14 (\"bpf,fork: wipe ->bpf_storage\nbefore bailouts that access it\"), sk_clone() performs an initial\nshallow copy of the socket field ->sk_bpf_storage via sock_copy()\nfor the cloned socket newsk.\n\nIf sk_clone() bails out early (e.g. if sk_filter_charge() fails) prior\nto calling bpf_sk_storage_clone(), newsk->sk_bpf_storage still points\nto the parent socket's BPF local storage. When newsk is subsequently\nfreed via sk_free(), the deallocation path (__sk_destruct() ->\nbpf_sk_storage_free()) destroys the parent socket's BPF local storage,\nleading to a use-after-free (UAF) on the parent socket.\n\nFix this by resetting newsk->sk_bpf_storage to NULL immediately after\nsock_copy() in sk_clone(), and remove the now redundant initialization\nfrom bpf_sk_storage_clone()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable clone path and its early-bailout condition are driven through the BPF sk_storage subsystem and local socket setup (attaching sk_storage, attaching a socket filter, adjusting optmem_max). Per kernel guidance BPF is Local; a remote peer cannot control the bailout conditions.\nAC:L - An attacker who controls the local setup can deterministically force the early bailout by attaching a filter and lowering net.core.optmem_max below the filter size, exactly the sysctl-change scenario the code documents, making sk_filter_charge fail on every clone.\nPR:L - Reaching the bug requires attaching BPF sk_storage and manipulating socket/net settings; these capabilities (CAP_BPF/CAP_NET_ADMIN) can be reachable via user namespaces in some configurations, so the lower-privilege value is chosen per the higher-severity rule.\nUI:N - The clone is triggered by connection acceptance or association creation with no victim action; no user interaction is needed.\nS:U - The UAF corrupts kernel socket/BPF-storage objects within the kernel's own security authority; no crossing into a separate security scope (no VM/IOMMU boundary).\nC:H - The use-after-free lets the attacker reclaim the freed bpf_local_storage object with controlled contents, enabling disclosure of kernel memory; per guidance UAF is High.\nI:H - UAF on a live socket's BPF storage enables heap grooming and arbitrary-write primitives, giving control-flow hijack potential; per guidance UAF is High.\nA:H - Destroying the parent socket's still-referenced BPF local storage reliably causes memory corruption, oops, and kernel panic; per guidance any UAF/crash is High."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/bpf_sk_storage.c","net/core/sock.c"],"versions":[{"version":"6ac99e8f23d4b10258406ca0dd7bffca5f31da9d","lessThan":"14b49b5ab29979552c219a09e569b424fbbf4a6e","status":"affected","versionType":"git"},{"version":"6ac99e8f23d4b10258406ca0dd7bffca5f31da9d","lessThan":"7cbd0c4cebe4c9f678d15e6b9ba975e1155a107f","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/bpf_sk_storage.c","net/core/sock.c"],"versions":[{"version":"5.2","status":"affected"},{"version":"0","lessThan":"5.2","status":"unaffected","versionType":"semver"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"5.2","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/14b49b5ab29979552c219a09e569b424fbbf4a6e"},{"url":"https://git.kernel.org/stable/c/7cbd0c4cebe4c9f678d15e6b9ba975e1155a107f"}],"title":"bpf: Fix UAF in sock clone early bailouts","x_generator":{"engine":"bippy-1.2.0"}}}}