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CVE-2021-46908

bpf: Use correct permission flag for mixed signed bounds arithmetic

MEDIUM
5.5
CVSS Score
Published: February 27, 2024 at 06:53 AM UTC
Updated: August 5, 2026 at 09:24 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Use correct permission flag for mixed signed bounds arithmetic We forbid adding unknown scalars with mixed signed bounds due to the spectre v1 masking mitigation. Hence this also needs bypass_spec_v1 flag instead of allow_ptr_leaks.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.11.0 ≤ v < 5.11.165.8 ≤ v < 5.10.325.8 ≤ v < 5.11.165.8 ≤ v < 5.125.8.0 ≤ v < 5.10.322c78ee898d8f10ae6fb2fa23a3fbaec96b1b73665.8
Vendor states this is fixed in 4ccdc6c6cae38b91c871293fb0ed8c6845a61b51 (fixed)
Vendor states this is fixed in 4f3ff11204eac0ee23acf64deecb3bad7b0db0c6 (fixed)
Vendor states this is fixed in 9601148392520e2e134936e76788fc2a6371e7be (fixed)
Vendor states this is fixed in 5.10.32 (unaffected)
Vendor states this is fixed in 5.11.16 (unaffected)
Vendor states this is fixed in 5.12 (unaffected)
Vendor states this is fixed in 5.8 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4ccdc6c6cae38b91c871293fb0ed8c6845a61b51
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4f3ff11204eac0ee23acf64deecb3bad7b0db0c6
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/9601148392520e2e134936e76788fc2a6371e7be

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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