UnratedFix available
bpf: Fix stack slot index in nospec checks
Type: advisorySources: OSV
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[].
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.261, 5.15.212, 6.1.178, 6.12.97, 6.18.40, 6.6.145, 7.1.5
- CVEs
- CVE-2026-72428
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 08:58 UTC · Revision 1
Source evidence
bpf: Fix stack slot index in nospec checks
core-osv · Original sourcePublished 15 Aug 2026, 05:56 UTC
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[].
osv:CVE-2026-72428
Kernel
Fixed versions: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
Complete source record
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"title": "bpf: Fix stack slot index in nospec checks",
"summary": "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[].",
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"https://git.kernel.org/stable/c/a71eb8f730a91271cf47ce291e785b6b7e54622f",
"https://git.kernel.org/stable/c/ca119656baa8f48a56e0c2f3ab63fdd33ca9e307",
"https://git.kernel.org/stable/c/d1d53aa30ab3b5ae89161c9cc840b3f7489ad386",
"https://git.kernel.org/stable/c/db8f1dcf5950b91886b9df4270bc816370d292c1",
"https://git.kernel.org/stable/c/e62268e695075a481a6c4feeb022c19cf57422a6",
"https://git.kernel.org/stable/c/f1471aa76d74e0df3b2a90731ca0208f498c670b",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72428.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-72428",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72428.json"
}
},
"related_cves": [
{
"value": "CVE-2026-72428",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 98350,
"published_at": "2026-08-15T05:56:44.831+00:00"
}