{"id":"CVE-2026-72428","state":"PUBLISHED","title":"bpf: Fix stack slot index in nospec checks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stack slot index in nospec checks\n\ncheck_stack_write_fixed_off() computes the byte slot for a fixed-offset\nstack write as -off - 1, and records each written byte in slot_type[] with\n(slot - i) % BPF_REG_SIZE.\n\nThe Spectre v4 sanitization pre-check uses slot_type[i] instead. For a\n4-byte write at fp-8 after the lower half of fp-8 has been zeroed, the\npre-check scans bytes 0..3 and sees STACK_ZERO while the actual write updates\nbytes 7..4. That can leave the second half-slot write without nospec_result\neven though the bytes being overwritten still require sanitization.\n\nUse the same slot index in the sanitization pre-check that the write path uses\nwhen updating slot_type[].","publishedAt":"2026-08-15T05:56:44.831Z","updatedAt":"2026-08-17T05:14:27.751Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0e9280654aa482088ee6ef3deadef331f5ac5fb0","status":"affected","lessThan":"e62268e695075a481a6c4feeb022c19cf57422a6","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"a71eb8f730a91271cf47ce291e785b6b7e54622f","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"ca119656baa8f48a56e0c2f3ab63fdd33ca9e307","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"475405593de2b796224c6297aece44f321195919","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"f1471aa76d74e0df3b2a90731ca0208f498c670b","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"68b41e68a62299f26cb16af422b5c7d1c69dafd9","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"db8f1dcf5950b91886b9df4270bc816370d292c1","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"d1d53aa30ab3b5ae89161c9cc840b3f7489ad386","versionType":"git"},{"version":"872968502114d68c21419cf7eb5ab97717e7b803","status":"affected","versionType":"git"},{"version":"f5893af2704eb763eb982f01d573f5b19f06b623","status":"affected","versionType":"git"},{"version":"0b27bdf02c400684225ee5ee99970bcbf5082282","status":"affected","versionType":"git"},{"version":"5.10.56","status":"affected","lessThan":"5.10.261","versionType":"semver"},{"version":"4.19.207","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.146","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.13.8","status":"affected","lessThan":"5.14","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]}],"references":["https://git.kernel.org/stable/c/e62268e695075a481a6c4feeb022c19cf57422a6","https://git.kernel.org/stable/c/a71eb8f730a91271cf47ce291e785b6b7e54622f","https://git.kernel.org/stable/c/ca119656baa8f48a56e0c2f3ab63fdd33ca9e307","https://git.kernel.org/stable/c/475405593de2b796224c6297aece44f321195919","https://git.kernel.org/stable/c/f1471aa76d74e0df3b2a90731ca0208f498c670b","https://git.kernel.org/stable/c/68b41e68a62299f26cb16af422b5c7d1c69dafd9","https://git.kernel.org/stable/c/db8f1dcf5950b91886b9df4270bc816370d292c1","https://git.kernel.org/stable/c/d1d53aa30ab3b5ae89161c9cc840b3f7489ad386"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72428.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72428","state":"PUBLISHED","datePublished":"2026-08-15T05:56:44.831Z","dateUpdated":"2026-08-17T05:14:27.751Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.928Z"},"containers":{"cna":{"title":"bpf: Fix stack slot index in nospec checks","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stack slot index in nospec checks\n\ncheck_stack_write_fixed_off() computes the byte slot for a fixed-offset\nstack write as -off - 1, and records each written byte in slot_type[] with\n(slot - i) % BPF_REG_SIZE.\n\nThe Spectre v4 sanitization pre-check uses slot_type[i] instead. For a\n4-byte write at fp-8 after the lower half of fp-8 has been zeroed, the\npre-check scans bytes 0..3 and sees STACK_ZERO while the actual write updates\nbytes 7..4. That can leave the second half-slot write without nospec_result\neven though the bytes being overwritten still require sanitization.\n\nUse the same slot index in the sanitization pre-check that the write path uses\nwhen updating slot_type[]."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0e9280654aa482088ee6ef3deadef331f5ac5fb0","status":"affected","lessThan":"e62268e695075a481a6c4feeb022c19cf57422a6","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"a71eb8f730a91271cf47ce291e785b6b7e54622f","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"ca119656baa8f48a56e0c2f3ab63fdd33ca9e307","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"475405593de2b796224c6297aece44f321195919","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"f1471aa76d74e0df3b2a90731ca0208f498c670b","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"68b41e68a62299f26cb16af422b5c7d1c69dafd9","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"db8f1dcf5950b91886b9df4270bc816370d292c1","versionType":"git"},{"version":"2039f26f3aca5b0e419b98f65dd36481337b86ee","status":"affected","lessThan":"d1d53aa30ab3b5ae89161c9cc840b3f7489ad386","versionType":"git"},{"version":"872968502114d68c21419cf7eb5ab97717e7b803","status":"affected","versionType":"git"},{"version":"f5893af2704eb763eb982f01d573f5b19f06b623","status":"affected","versionType":"git"},{"version":"0b27bdf02c400684225ee5ee99970bcbf5082282","status":"affected","versionType":"git"},{"version":"5.10.56","status":"affected","lessThan":"5.10.261","versionType":"semver"},{"version":"4.19.207","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.146","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.13.8","status":"affected","lessThan":"5.14","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e62268e695075a481a6c4feeb022c19cf57422a6"},{"url":"https://git.kernel.org/stable/c/a71eb8f730a91271cf47ce291e785b6b7e54622f"},{"url":"https://git.kernel.org/stable/c/ca119656baa8f48a56e0c2f3ab63fdd33ca9e307"},{"url":"https://git.kernel.org/stable/c/475405593de2b796224c6297aece44f321195919"},{"url":"https://git.kernel.org/stable/c/f1471aa76d74e0df3b2a90731ca0208f498c670b"},{"url":"https://git.kernel.org/stable/c/68b41e68a62299f26cb16af422b5c7d1c69dafd9"},{"url":"https://git.kernel.org/stable/c/db8f1dcf5950b91886b9df4270bc816370d292c1"},{"url":"https://git.kernel.org/stable/c/d1d53aa30ab3b5ae89161c9cc840b3f7489ad386"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:14:27.751Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.56","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criter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