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CVE-2026-72428

UnknownEPSS 0.21%

Last modified

CVE-2026-72428 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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[].

Metrics

EPSS Probability
0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 0e9280654aa482088ee6ef3deadef331f5ac5fb0, < e62268e695075a481a6c4feeb022c19cf57422a6; >= 2039f26f3aca5b0e419b98f65dd36481337b86ee, < a71eb8f730a91271cf47ce291e785b6b7e54622f; >= 2039f26f3aca5b0e419b98f65dd36481337b86ee, < ca119656baa8f48a56e0c2f3ab63fdd33ca9e307; >= 2039f26f3aca5b0e419b98f65dd36481337b86ee, < 475405593de2b796224c6297aece44f321195919; >= 2039f26f3aca5b0e419b98f65dd36481337b86ee, < f1471aa76d74e0df3b2a90731ca0208f498c670b; >= 2039f26f3aca5b0e419b98f65dd36481337b86ee, < 68b41e68a62299f26cb16af422b5c7d1c69dafd9; >= 2039f26f3aca5b0e419b98f65dd36481337b86ee, < db8f1dcf5950b91886b9df4270bc816370d292c1; >= 2039f26f3aca5b0e419b98f65dd36481337b86ee, < d1d53aa30ab3b5ae89161c9cc840b3f7489ad386; 872968502114d68c21419cf7eb5ab97717e7b803; f5893af2704eb763eb982f01d573f5b19f06b623; 0b27bdf02c400684225ee5ee99970bcbf5082282; >= 5.10.56, < 5.10.261; >= 4.19.207, < 4.20; >= 5.4.146, < 5.5; >= 5.13.8, < 5.14
LinuxLinux5.14

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72428?
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[].
How severe is CVE-2026-72428?
Severity scoring for CVE-2026-72428 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72428?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST