{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90393","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.810Z","datePublished":"2026-09-17T16:09:26.388Z","dateUpdated":"2026-09-17T16:09:26.388Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-17T16:09:26.388Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix potential UAF in bpf_netns_link_update_prog\n\nIn bpf_netns_link_update_prog, the checks for old_prog and prog type\nare currently performed locklessly before acquiring netns_bpf_mutex.\nThis creates a race condition that can lead to a UAF issue.\n\nIf two threads concurrently execute BPF_LINK_UPDATE on the same netns\nlink, the following execution path can trigger a UAF:\n\nCPU0                                          CPU1\nbpf_netns_link_update_prog\n  if (old_prog && old_prog != link->prog)\n    return -EPERM;\n                                              bpf_netns_link_update_prog\n                                                if (old_prog && old_prog != link->prog)\n                                                ...\n                                                old_prog = xchg(&link->prog, new_prog);\n                                                bpf_prog_put(old_prog);\n  if (new_prog->type != link->prog->type) <-- trigger UAF\n\nFix this by moving the old_prog and prog->type checks inside the\nnetns_bpf_mutex critical section. Meanwhile, use guard() to simplify\nlock management and avoid all the goto jumping."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/net_namespace.c"],"versions":[{"version":"7f045a49fee04b5662cbdeaf0838f9322ae8c63a","lessThan":"d462b5481d77ce7df8a5ff89a699386f00c9214d","status":"affected","versionType":"git"},{"version":"7f045a49fee04b5662cbdeaf0838f9322ae8c63a","lessThan":"bdddf3e1493ee973619c154a57071ce67f78598b","status":"affected","versionType":"git"},{"version":"7f045a49fee04b5662cbdeaf0838f9322ae8c63a","lessThan":"79a66fd997d4eecf17302d613194879eb32e0986","status":"affected","versionType":"git"},{"version":"7f045a49fee04b5662cbdeaf0838f9322ae8c63a","lessThan":"f4ce6803df4095777191d800bebc50219b615ca0","status":"affected","versionType":"git"},{"version":"7f045a49fee04b5662cbdeaf0838f9322ae8c63a","lessThan":"277168cb9d153ce8e9c3f9275670e32ae61b41d6","status":"affected","versionType":"git"},{"version":"7f045a49fee04b5662cbdeaf0838f9322ae8c63a","lessThan":"bda86e9f31b9a296b6e64a51c91dc776fc9f613e","status":"affected","versionType":"git"},{"version":"7f045a49fee04b5662cbdeaf0838f9322ae8c63a","lessThan":"923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7","status":"affected","versionType":"git"},{"version":"7f045a49fee04b5662cbdeaf0838f9322ae8c63a","lessThan":"5c5997836381010fc5907b36bc17d3b19407e933","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/net_namespace.c"],"versions":[{"version":"5.8","status":"affected"},{"version":"0","lessThan":"5.8","status":"unaffected","versionType":"semver"},{"version":"5.10.270","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.221","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.188","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","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":"5.8","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/d462b5481d77ce7df8a5ff89a699386f00c9214d"},{"url":"https://git.kernel.org/stable/c/bdddf3e1493ee973619c154a57071ce67f78598b"},{"url":"https://git.kernel.org/stable/c/79a66fd997d4eecf17302d613194879eb32e0986"},{"url":"https://git.kernel.org/stable/c/f4ce6803df4095777191d800bebc50219b615ca0"},{"url":"https://git.kernel.org/stable/c/277168cb9d153ce8e9c3f9275670e32ae61b41d6"},{"url":"https://git.kernel.org/stable/c/bda86e9f31b9a296b6e64a51c91dc776fc9f613e"},{"url":"https://git.kernel.org/stable/c/923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7"},{"url":"https://git.kernel.org/stable/c/5c5997836381010fc5907b36bc17d3b19407e933"}],"title":"bpf: Fix potential UAF in bpf_netns_link_update_prog","x_generator":{"engine":"bippy-1.2.0"}}}}