CVE-2021-46974

Medium

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.

Package Linux Kernel
Published 2024-02-27
Last modified 2025-01-09
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

5.5

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 4.14.113, 4.19.19, 4.20.6, 5.0 and later are affected. Fixed in 4.14.233, 4.19.190, 5.4.117, 5.10.35, 5.11.19, 5.12.2, 5.13 and their respective stable series.

Affected from
≥ 4.14.113 ≥ 4.19.19 ≥ 4.20.6 ≥ 5.0
Fixed in
✓ 4.14.233 4.14.x ✓ 4.19.190 4.19.x ✓ 5.4.117 5.4.x ✓ 5.10.35 5.10.x ✓ 5.11.19 5.11.x ✓ 5.12.2 5.12.x ✓ 5.13

References

7 total
Showing 5 of 7 references View all on NVD

Frequently asked questions

  • What is CVE-2021-46974?

    CVE-2021-46974 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.14.113 onward and has been patched in 4.14.233, 4.19.190, 5.4.117 and others. CVE-2021-46974 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-46974?

    CVE-2021-46974 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2021-46974?

    Yes. CVE-2021-46974 has been patched. Fixed versions include 4.14.233, 4.19.190, 5.4.117 and others. If you are running Linux kernel 4.14.113 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2021-46974 actively exploited?

    No. CVE-2021-46974 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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