{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2024-36937","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-30T15:25:07.071Z","datePublished":"2024-05-30T15:29:26.353Z","dateUpdated":"2025-05-04T09:12:26.458Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T09:12:26.458Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxdp: use flags field to disambiguate broadcast redirect\n\nWhen redirecting a packet using XDP, the bpf_redirect_map() helper will set\nup the redirect destination information in struct bpf_redirect_info (using\nthe __bpf_xdp_redirect_map() helper function), and the xdp_do_redirect()\nfunction will read this information after the XDP program returns and pass\nthe frame on to the right redirect destination.\n\nWhen using the BPF_F_BROADCAST flag to do multicast redirect to a whole\nmap, __bpf_xdp_redirect_map() sets the 'map' pointer in struct\nbpf_redirect_info to point to the destination map to be broadcast. And\nxdp_do_redirect() reacts to the value of this map pointer to decide whether\nit's dealing with a broadcast or a single-value redirect. However, if the\ndestination map is being destroyed before xdp_do_redirect() is called, the\nmap pointer will be cleared out (by bpf_clear_redirect_map()) without\nwaiting for any XDP programs to stop running. This causes xdp_do_redirect()\nto think that the redirect was to a single target, but the target pointer\nis also NULL (since broadcast redirects don't have a single target), so\nthis causes a crash when a NULL pointer is passed to dev_map_enqueue().\n\nTo fix this, change xdp_do_redirect() to react directly to the presence of\nthe BPF_F_BROADCAST flag in the 'flags' value in struct bpf_redirect_info\nto disambiguate between a single-target and a broadcast redirect. And only\nread the 'map' pointer if the broadcast flag is set, aborting if that has\nbeen cleared out in the meantime. This prevents the crash, while keeping\nthe atomic (cmpxchg-based) clearing of the map pointer itself, and without\nadding any more checks in the non-broadcast fast path."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c"],"versions":[{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","lessThan":"12481f30128fbebc2eeb55eb2d56390fdfa30c5e","status":"affected","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","lessThan":"272bfb019f3cc018f654b992115774e77b4f3ffc","status":"affected","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","lessThan":"e22e25820fa04ea5eaac4ef7ee200e9923f466a4","status":"affected","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","lessThan":"6fd81f9d333e7b3532036577b1beb74ba1323553","status":"affected","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","lessThan":"5bcf0dcbf9066348058b88a510c57f70f384c92c","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/filter.c"],"versions":[{"version":"5.14","status":"affected"},{"version":"0","lessThan":"5.14","status":"unaffected","versionType":"semver"},{"version":"5.15.159","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.91","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.31","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.8.10","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","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":"5.14","versionEndExcluding":"5.15.159"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.31"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.8.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/12481f30128fbebc2eeb55eb2d56390fdfa30c5e"},{"url":"https://git.kernel.org/stable/c/272bfb019f3cc018f654b992115774e77b4f3ffc"},{"url":"https://git.kernel.org/stable/c/e22e25820fa04ea5eaac4ef7ee200e9923f466a4"},{"url":"https://git.kernel.org/stable/c/6fd81f9d333e7b3532036577b1beb74ba1323553"},{"url":"https://git.kernel.org/stable/c/5bcf0dcbf9066348058b88a510c57f70f384c92c"}],"title":"xdp: use flags field to disambiguate broadcast redirect","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T03:43:50.646Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/12481f30128fbebc2eeb55eb2d56390fdfa30c5e","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/272bfb019f3cc018f654b992115774e77b4f3ffc","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/e22e25820fa04ea5eaac4ef7ee200e9923f466a4","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/6fd81f9d333e7b3532036577b1beb74ba1323553","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/5bcf0dcbf9066348058b88a510c57f70f384c92c","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-36937","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T17:15:48.388446Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:34:59.643Z"}}]}}