cve-2021-46974
Vulnerability from cvelistv5
Published
2024-02-27 18:47
Modified
2024-12-19 07:32
Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix masking negation logic upon negative dst register
The negation logic for the case where the off_reg is sitting in the
dst register is not correct given then we cannot just invert the add
to a sub or vice versa. As a fix, perform the final bitwise and-op
unconditionally into AX from the off_reg, then move the pointer from
the src to dst and finally use AX as the source for the original
pointer arithmetic operation such that the inversion yields a correct
result. The single non-AX mov in between is possible given constant
blinding is retaining it as it's not an immediate based operation.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: ae03b6b1c880a03d4771257336dc3bca156dd51b Version: f92a819b4cbef8c9527d9797110544b2055a4b96 Version: 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 Version: 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 Version: 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 Version: 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 Version: 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 |
||||||
|
|||||||||
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As a fix, perform the final bitwise and-op\\nunconditionally into AX from the off_reg, then move the pointer from\\nthe src to dst and finally use AX as the source for the original\\npointer arithmetic operation such that the inversion yields a correct\\nresult. The single non-AX mov in between is possible given constant\\nblinding is retaining it as it\u0027s not an immediate based operation.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:32:51.644Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-46974\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:32:51.644Z\", \"dateReserved\": \"2024-02-27T18:42:55.944Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:47:08.487Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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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.
- 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.