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[].

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0022.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

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References
Link Providers
https://git.kernel.org/stable/c/475405593de2b796224c6297aece44f321195919 cve-icon cve-icon
https://git.kernel.org/stable/c/68b41e68a62299f26cb16af422b5c7d1c69dafd9 cve-icon cve-icon
https://git.kernel.org/stable/c/a71eb8f730a91271cf47ce291e785b6b7e54622f cve-icon cve-icon
https://git.kernel.org/stable/c/ca119656baa8f48a56e0c2f3ab63fdd33ca9e307 cve-icon cve-icon
https://git.kernel.org/stable/c/d1d53aa30ab3b5ae89161c9cc840b3f7489ad386 cve-icon cve-icon
https://git.kernel.org/stable/c/db8f1dcf5950b91886b9df4270bc816370d292c1 cve-icon cve-icon
https://git.kernel.org/stable/c/e62268e695075a481a6c4feeb022c19cf57422a6 cve-icon cve-icon
https://git.kernel.org/stable/c/f1471aa76d74e0df3b2a90731ca0208f498c670b cve-icon cve-icon
History

Sat, 15 Aug 2026 06:00:00 +0000

Type Values Removed Values Added
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[].
Title bpf: Fix stack slot index in nospec checks
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-15T05:56:44.831Z

Reserved: 2026-08-09T03:40:39.928Z

Link: CVE-2026-72428

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T06:22:16.637

Modified: 2026-08-15T06:22:16.637

Link: CVE-2026-72428

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.