ghsa-78xq-q56p-fpwx
Vulnerability from github
Published
2024-02-27 21:31
Modified
2024-02-27 21:31
Details
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.
{ "affected": [], "aliases": [ "CVE-2021-46974" ], "database_specific": { "cwe_ids": [], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2024-02-27T19:04:07Z", "severity": null }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix masking negation logic upon negative dst register\n\nThe negation logic for the case where the off_reg is sitting in the\ndst register is not correct given then we cannot just invert the add\nto a sub or vice versa. 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.", "id": "GHSA-78xq-q56p-fpwx", "modified": "2024-02-27T21:31:27Z", "published": "2024-02-27T21:31:27Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46974" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807" } ], "schema_version": "1.4.0", "severity": [] }
Loading...
Loading...
- 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.