CVE-2023-52462

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Description

A flaw was found in the Linux kernel. When the register is spilled onto a stack as a 1/2/4-byte register, the slot_type[BPF_REG_SIZE - 1]  is set, possibly including a few more below it, depending on the actual spill size. To confirm if some stack slots have a spilled register, consult slot_type[7], not slot_type[0]. To avoid the need to remember and double-check this in the future, use the is_spilled_reg() helper.

A flaw was found in the Linux kernel. When the register is spilled onto a stack as a 1/2/4-byte register, the slot_type[BPF_REG_SIZE - 1]  is set, possibly including a few more below it, depending on the actual spill size. To confirm if some stack slots have a spilled register, consult slot_type[7], not slot_type[0]. To avoid the need to remember and double-check this in the future, use the is_spilled_reg() helper.

Mitigation

No mitigation is currently available for this vulnerability. Make sure to perform the updates as they become available.

Additional information

  • Bugzilla 2265798: kernel: bpf: fix check for attempt to corrupt spilled pointer
  • FAQ: Frequently asked questions about CVE-2023-52462

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown
Red HatNVD

CVSS v3 Base Score

4.4

5.5

Attack Vector

Local

Local

Attack Complexity

Low

Low

Privileges Required

High

Low

User Interaction

None

None

Scope

Unchanged

Unchanged

Confidentiality Impact

None

None

Integrity Impact

High

High

Availability Impact

None

None

CVSS v3 Vector

Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?

What can I do if my product is listed as "Will not fix"?

What can I do if my product is listed as "Fix deferred"?

What is a mitigation?

I have a Red Hat product but it is not in the above list, is it affected?

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

My product is listed as "Out of Support Scope". What does this mean?

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