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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-72428

bpf: Fix stack slot index in nospec checks

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Status
Published
Published
Updated
Assigning organization
Linux

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[].

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 0e9280654aa482088ee6ef3deadef331f5ac5fb0 to < e62268e695075a481a6c4feeb022c19cf57422a6affected
  • 2039f26f3aca5b0e419b98f65dd36481337b86ee to < a71eb8f730a91271cf47ce291e785b6b7e54622faffected
  • 2039f26f3aca5b0e419b98f65dd36481337b86ee to < ca119656baa8f48a56e0c2f3ab63fdd33ca9e307affected
  • 2039f26f3aca5b0e419b98f65dd36481337b86ee to < 475405593de2b796224c6297aece44f321195919affected
  • 2039f26f3aca5b0e419b98f65dd36481337b86ee to < f1471aa76d74e0df3b2a90731ca0208f498c670baffected
  • 2039f26f3aca5b0e419b98f65dd36481337b86ee to < 68b41e68a62299f26cb16af422b5c7d1c69dafd9affected
  • 2039f26f3aca5b0e419b98f65dd36481337b86ee to < db8f1dcf5950b91886b9df4270bc816370d292c1affected
  • 2039f26f3aca5b0e419b98f65dd36481337b86ee to < d1d53aa30ab3b5ae89161c9cc840b3f7489ad386affected
  • 872968502114d68c21419cf7eb5ab97717e7b803affected
  • f5893af2704eb763eb982f01d573f5b19f06b623affected
  • 0b27bdf02c400684225ee5ee99970bcbf5082282affected
  • 5.10.56 to < 5.10.261affected
  • 4.19.207 to < 4.20affected
  • 5.4.146 to < 5.5affected
  • 5.13.8 to < 5.14affected

Linux Linux

Default version status: affected

  • 5.14affected
  • 0 to < 5.14unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References