CVE-2026-72428 (GCVE-0-2026-72428)
Vulnerability from cvelistv5
Published
2026-08-15 05:56
Modified
2026-08-17 05:14
Severity ?
VLAI Severity ?
EPSS score ?
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[].
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 0e9280654aa482088ee6ef3deadef331f5ac5fb0 Version: 2039f26f3aca5b0e419b98f65dd36481337b86ee Version: 2039f26f3aca5b0e419b98f65dd36481337b86ee Version: 2039f26f3aca5b0e419b98f65dd36481337b86ee Version: 2039f26f3aca5b0e419b98f65dd36481337b86ee Version: 2039f26f3aca5b0e419b98f65dd36481337b86ee Version: 2039f26f3aca5b0e419b98f65dd36481337b86ee Version: 2039f26f3aca5b0e419b98f65dd36481337b86ee Version: 872968502114d68c21419cf7eb5ab97717e7b803 Version: f5893af2704eb763eb982f01d573f5b19f06b623 Version: 0b27bdf02c400684225ee5ee99970bcbf5082282 Version: 5.10.56 ≤ Version: 4.19.207 ≤ Version: 5.4.146 ≤ Version: 5.13.8 ≤ |
||
{
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{
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{
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stack slot index in nospec checks\n\ncheck_stack_write_fixed_off() computes the byte slot for a fixed-offset\nstack write as -off - 1, and records each written byte in slot_type[] with\n(slot - i) % BPF_REG_SIZE.\n\nThe Spectre v4 sanitization pre-check uses slot_type[i] instead. For a\n4-byte write at fp-8 after the lower half of fp-8 has been zeroed, the\npre-check scans bytes 0..3 and sees STACK_ZERO while the actual write updates\nbytes 7..4. That can leave the second half-slot write without nospec_result\neven though the bytes being overwritten still require sanitization.\n\nUse the same slot index in the sanitization pre-check that the write path uses\nwhen updating slot_type[]."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:14:27.751Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e62268e695075a481a6c4feeb022c19cf57422a6"
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{
"url": "https://git.kernel.org/stable/c/a71eb8f730a91271cf47ce291e785b6b7e54622f"
},
{
"url": "https://git.kernel.org/stable/c/ca119656baa8f48a56e0c2f3ab63fdd33ca9e307"
},
{
"url": "https://git.kernel.org/stable/c/475405593de2b796224c6297aece44f321195919"
},
{
"url": "https://git.kernel.org/stable/c/f1471aa76d74e0df3b2a90731ca0208f498c670b"
},
{
"url": "https://git.kernel.org/stable/c/68b41e68a62299f26cb16af422b5c7d1c69dafd9"
},
{
"url": "https://git.kernel.org/stable/c/db8f1dcf5950b91886b9df4270bc816370d292c1"
},
{
"url": "https://git.kernel.org/stable/c/d1d53aa30ab3b5ae89161c9cc840b3f7489ad386"
}
],
"title": "bpf: Fix stack slot index in nospec checks",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72428",
"datePublished": "2026-08-15T05:56:44.831Z",
"dateReserved": "2026-08-09T03:40:39.928Z",
"dateUpdated": "2026-08-17T05:14:27.751Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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