CVE-2021-46974
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
bpf: Fix masking negation logic upon negative dst register
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| ae03b6b1c880a03d4771257336dc3bca156dd51b | affected | git | 4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba | Unavailable | None listed |
| f92a819b4cbef8c9527d9797110544b2055a4b96 | affected | git | 0e2dfdc74a7f4036127356d42ea59388f153f42c | Unavailable | None listed |
| 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 | affected | git | 53e0db429b37a32b8fc706d0d90eb4583ad13848 | Unavailable | None listed |
| 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 | affected | git | 2cfa537674cd1051a3b8111536d77d0558f33d5d | Unavailable | None listed |
| 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 | affected | git | 6eba92a4d4be8feb4dc33976abac544fa99d6ecc | Unavailable | None listed |
| 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 | affected | git | 7cf64d8679ca1cb20cf57d6a88bfee79a0922a66 | Unavailable | None listed |
| 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 | affected | git | b9b34ddbe2076ade359cd5ce7537d5ed019e9807 | Unavailable | None listed |
| 078da99d449f64ca04d459cdbdcce513b64173cd | affected | git | Unavailable | Unavailable | None listed |
| 4.14.113 | affected | semver | 4.14.233 | Unavailable | None listed |
| 4.19.19 | affected | semver | 4.19.190 | Unavailable | None listed |
| 4.20.6 | affected | semver | 4.21 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.0 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.0 | Unavailable | None listed |
| 4.14.233 | unaffected | semver | Unavailable | 4.14.* | None listed |
| 4.19.190 | unaffected | semver | Unavailable | 4.19.* | None listed |
| 5.4.117 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.35 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.11.19 | unaffected | semver | Unavailable | 5.11.* | None listed |
| 5.12.2 | unaffected | semver | Unavailable | 5.12.* | None listed |
| 5.13 | unaffected | original_commit_for_fix | Unavailable | * | None listed |