{"id":"CVE-2024-50163","state":"PUBLISHED","title":"bpf: Make sure internal and UAPI bpf_redirect flags don't overlap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Make sure internal and UAPI bpf_redirect flags don't overlap\n\nThe bpf_redirect_info is shared between the SKB and XDP redirect paths,\nand the two paths use the same numeric flag values in the ri->flags\nfield (specifically, BPF_F_BROADCAST == BPF_F_NEXTHOP). This means that\nif skb bpf_redirect_neigh() is used with a non-NULL params argument and,\nsubsequently, an XDP redirect is performed using the same\nbpf_redirect_info struct, the XDP path will get confused and end up\ncrashing, which syzbot managed to trigger.\n\nWith the stack-allocated bpf_redirect_info, the structure is no longer\nshared between the SKB and XDP paths, so the crash doesn't happen\nanymore. However, different code paths using identically-numbered flag\nvalues in the same struct field still seems like a bit of a mess, so\nthis patch cleans that up by moving the flag definitions together and\nredefining the three flags in BPF_F_REDIRECT_INTERNAL to not overlap\nwith the flags used for XDP. It also adds a BUILD_BUG_ON() check to make\nsure the overlap is not re-introduced by mistake.","publishedAt":"2024-11-07T09:31:40.146Z","updatedAt":"2026-05-11T20:46:39.806Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"4e1e428533845d48828bd3875c0e92e8565b9962","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"314dbee9fe4f5cee36435465de52c988d7caa466","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"0fca5ed4be8e8bfbfb9bd97845af596bab7192d3","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"cec288e05ceac9a0d3a3a1fd279534b11844c826","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"09d88791c7cd888d5195c84733caf9183dcfbd16","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/uapi/linux/bpf.h","net/core/filter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.170","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.115","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.59","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.11.6","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/uapi/linux/bpf.h","net/core/filter.c"]}],"references":["https://git.kernel.org/stable/c/4e1e428533845d48828bd3875c0e92e8565b9962","https://git.kernel.org/stable/c/314dbee9fe4f5cee36435465de52c988d7caa466","https://git.kernel.org/stable/c/0fca5ed4be8e8bfbfb9bd97845af596bab7192d3","https://git.kernel.org/stable/c/cec288e05ceac9a0d3a3a1fd279534b11844c826","https://git.kernel.org/stable/c/09d88791c7cd888d5195c84733caf9183dcfbd16","https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:56.516Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/50xxx/CVE-2024-50163.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-50163","state":"PUBLISHED","datePublished":"2024-11-07T09:31:40.146Z","dateUpdated":"2026-05-11T20:46:39.806Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-10-21T19:36:19.961Z"},"containers":{"cna":{"title":"bpf: Make sure internal and UAPI bpf_redirect flags don't overlap","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Make sure internal and UAPI bpf_redirect flags don't overlap\n\nThe bpf_redirect_info is shared between the SKB and XDP redirect paths,\nand the two paths use the same numeric flag values in the ri->flags\nfield (specifically, BPF_F_BROADCAST == BPF_F_NEXTHOP). This means that\nif skb bpf_redirect_neigh() is used with a non-NULL params argument and,\nsubsequently, an XDP redirect is performed using the same\nbpf_redirect_info struct, the XDP path will get confused and end up\ncrashing, which syzbot managed to trigger.\n\nWith the stack-allocated bpf_redirect_info, the structure is no longer\nshared between the SKB and XDP paths, so the crash doesn't happen\nanymore. However, different code paths using identically-numbered flag\nvalues in the same struct field still seems like a bit of a mess, so\nthis patch cleans that up by moving the flag definitions together and\nredefining the three flags in BPF_F_REDIRECT_INTERNAL to not overlap\nwith the flags used for XDP. It also adds a BUILD_BUG_ON() check to make\nsure the overlap is not re-introduced by mistake."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"4e1e428533845d48828bd3875c0e92e8565b9962","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"314dbee9fe4f5cee36435465de52c988d7caa466","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"0fca5ed4be8e8bfbfb9bd97845af596bab7192d3","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"cec288e05ceac9a0d3a3a1fd279534b11844c826","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"09d88791c7cd888d5195c84733caf9183dcfbd16","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/uapi/linux/bpf.h","net/core/filter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.170","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.115","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.59","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.11.6","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/uapi/linux/bpf.h","net/core/filter.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4e1e428533845d48828bd3875c0e92e8565b9962"},{"url":"https://git.kernel.org/stable/c/314dbee9fe4f5cee36435465de52c988d7caa466"},{"url":"https://git.kernel.org/stable/c/0fca5ed4be8e8bfbfb9bd97845af596bab7192d3"},{"url":"https://git.kernel.org/stable/c/cec288e05ceac9a0d3a3a1fd279534b11844c826"},{"url":"https://git.kernel.org/stable/c/09d88791c7cd888d5195c84733caf9183dcfbd16"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:46:39.806Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"5.15.170"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.11.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2024-50163","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T20:20:08.619838Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","description":"CWE-noinfo Not enough information"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T20:27:11.921Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T22:26:20.591Z"}}]}}}