CVE-2026-72428
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[].
How to fix
- Linux Linuxe62268e695075a481a6c4feeb022c19cf57422a6, a71eb8f730a91271cf47ce291e785b6b7e54622f, ca119656baa8f48a56e0c2f3ab63fdd33ca9e307, 475405593de2b796224c6297aece44f321195919, f1471aa76d74e0df3b2a90731ca0208f498c670b, 68b41e68a62299f26cb16af422b5c7d1c69dafd9, db8f1dcf5950b91886b9df4270bc816370d292c1, d1d53aa30ab3b5ae89161c9cc840b3f7489ad386, 5.10.261, 4.20, 5.5, 5.14 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 0e9280654aa482088ee6ef3deadef331f5ac5fb0 ≤ v < e62268e695075a481a6c4feeb022c19cf57422a6, 2039f26f3aca5b0e419b98f65dd36481337b86ee ≤ v < a71eb8f730a91271cf47ce291e785b6b7e54622f, 2039f26f3aca5b0e419b98f65dd36481337b86ee ≤ v < ca119656baa8f48a56e0c2f3ab63fdd33ca9e307, 2039f26f3aca5b0e419b98f65dd36481337b86ee ≤ v < 475405593de2b796224c6297aece44f321195919, 2039f26f3aca5b0e419b98f65dd36481337b86ee ≤ v < f1471aa76d74e0df3b2a90731ca0208f498c670b, 2039f26f3aca5b0e419b98f65dd36481337b86ee ≤ v < 68b41e68a62299f26cb16af422b5c7d1c69dafd9, 2039f26f3aca5b0e419b98f65dd36481337b86ee ≤ v < db8f1dcf5950b91886b9df4270bc816370d292c1, 2039f26f3aca5b0e419b98f65dd36481337b86ee ≤ v < d1d53aa30ab3b5ae89161c9cc840b3f7489ad386, 872968502114d68c21419cf7eb5ab97717e7b803, f5893af2704eb763eb982f01d573f5b19f06b623, 0b27bdf02c400684225ee5ee99970bcbf5082282, 5.10.56 ≤ v < 5.10.261, 4.19.207 ≤ v < 4.20, 5.4.146 ≤ v < 5.5, 5.13.8 ≤ v < 5.14, 5.14 | e62268e695075a481a6c4feeb022c19cf57422a6, a71eb8f730a91271cf47ce291e785b6b7e54622f, ca119656baa8f48a56e0c2f3ab63fdd33ca9e307, 475405593de2b796224c6297aece44f321195919, f1471aa76d74e0df3b2a90731ca0208f498c670b, 68b41e68a62299f26cb16af422b5c7d1c69dafd9, db8f1dcf5950b91886b9df4270bc816370d292c1, d1d53aa30ab3b5ae89161c9cc840b3f7489ad386, 5.10.261, 4.20, 5.5, 5.14 |
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