bpf: Fix stack slot index in nospec checks
Summary
| CVE | CVE-2026-72428 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-15 06:22:16 UTC |
| Updated | 2026-08-17 06:19:10 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stack slot index in nospec checks check_stack_write_fixed_off() computes the byte slot for a fixed-offset stack write as -off - 1, and records each written byte in slot_type[] with (slot - i) % BPF_REG_SIZE. The Spectre v4 sanitization pre-check uses slot_type[i] instead. For a 4-byte write at fp-8 after the lower half of fp-8 has been zeroed, the pre-check scans bytes 0..3 and sees STACK_ZERO while the actual write updates bytes 7..4. That can leave the second half-slot write without nospec_result even though the bytes being overwritten still require sanitization. Use the same slot index in the sanitization pre-check that the write path uses when updating slot_type[]. |
Risk And Classification
EPSS: 0.002100000 probability, percentile 0.115350000 (date 2026-08-17)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 0e9280654aa482088ee6ef3deadef331f5ac5fb0 e62268e695075a481a6c4feeb022c19cf57422a6 git | Not specified |
| CNA | Linux | Linux | affected 2039f26f3aca5b0e419b98f65dd36481337b86ee a71eb8f730a91271cf47ce291e785b6b7e54622f git | Not specified |
| CNA | Linux | Linux | affected 2039f26f3aca5b0e419b98f65dd36481337b86ee ca119656baa8f48a56e0c2f3ab63fdd33ca9e307 git | Not specified |
| CNA | Linux | Linux | affected 2039f26f3aca5b0e419b98f65dd36481337b86ee 475405593de2b796224c6297aece44f321195919 git | Not specified |
| CNA | Linux | Linux | affected 2039f26f3aca5b0e419b98f65dd36481337b86ee f1471aa76d74e0df3b2a90731ca0208f498c670b git | Not specified |
| CNA | Linux | Linux | affected 2039f26f3aca5b0e419b98f65dd36481337b86ee 68b41e68a62299f26cb16af422b5c7d1c69dafd9 git | Not specified |
| CNA | Linux | Linux | affected 2039f26f3aca5b0e419b98f65dd36481337b86ee db8f1dcf5950b91886b9df4270bc816370d292c1 git | Not specified |
| CNA | Linux | Linux | affected 2039f26f3aca5b0e419b98f65dd36481337b86ee d1d53aa30ab3b5ae89161c9cc840b3f7489ad386 git | Not specified |
| CNA | Linux | Linux | affected 872968502114d68c21419cf7eb5ab97717e7b803 git | Not specified |
| CNA | Linux | Linux | affected f5893af2704eb763eb982f01d573f5b19f06b623 git | Not specified |
| CNA | Linux | Linux | affected 0b27bdf02c400684225ee5ee99970bcbf5082282 git | Not specified |
| CNA | Linux | Linux | affected 5.10.56 5.10.261 semver | Not specified |
| CNA | Linux | Linux | affected 4.19.207 4.20 semver | Not specified |
| CNA | Linux | Linux | affected 5.4.146 5.5 semver | Not specified |
| CNA | Linux | Linux | affected 5.13.8 5.14 semver | Not specified |
| CNA | Linux | Linux | affected 5.14 | Not specified |
| CNA | Linux | Linux | unaffected 5.14 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.261 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.212 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.97 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.40 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.5 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/d1d53aa30ab3b5ae89161c9cc840b3f7489ad386 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ca119656baa8f48a56e0c2f3ab63fdd33ca9e307 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f1471aa76d74e0df3b2a90731ca0208f498c670b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/db8f1dcf5950b91886b9df4270bc816370d292c1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e62268e695075a481a6c4feeb022c19cf57422a6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/475405593de2b796224c6297aece44f321195919 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/68b41e68a62299f26cb16af422b5c7d1c69dafd9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a71eb8f730a91271cf47ce291e785b6b7e54622f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.