CVE-2023-52447

Medium

In the Linux kernel, the following vulnerability has been resolved: bpf: Defer the free of inner map when necessary When updating or deleting an inner map in map array or map htab, the map may still be accessed by non-sleepable program or sleepable program. However bpf_map_fd_put_ptr() decreases the ref-counter of the inner map directly through bpf_map_put(), if the ref-counter is the last one (which is true for most cases), the inner map will be freed by ops->map_free() in a kworker. But for now, most .map_free() callbacks don't use synchronize_rcu() or its variants to wait for the elapse of a RCU grace period, so after the invocation of ops->map_free completes, the bpf program which is accessing the inner map may incur use-after-free problem. Fix the free of inner map by invoking bpf_map_free_deferred() after both one RCU grace period and one tasks trace RCU grace period if the inner map has been removed from the outer map before. The deferment is accomplished by using call_rcu() or call_rcu_tasks_trace() when releasing the last ref-counter of bpf map. The newly-added rcu_head field in bpf_map shares the same storage space with work field to reduce the size of bpf_map.

Package Linux Kernel
Published 2024-02-22
Last modified 2026-05-12
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

6.7

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

Weakness type

CWE-416

CVE-2023-52447 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.9 and later are affected. Fixed in 5.10.214, 5.15.153, 6.1.75, 6.6.14, 6.7.2, 6.8 and their respective stable series.

Affected from
≥ 5.9
Fixed in
✓ 5.10.214 5.10.x ✓ 5.15.153 5.15.x ✓ 6.1.75 6.1.x ✓ 6.6.14 6.6.x ✓ 6.7.2 6.7.x ✓ 6.8

References

8 total
Showing 5 of 8 references View all on NVD

Frequently asked questions

  • What is CVE-2023-52447?

    CVE-2023-52447 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.7 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 5.9 onward and has been patched in 5.10.214, 5.15.153, 6.1.75 and others. CVE-2023-52447 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2023-52447?

    CVE-2023-52447 has a CVSS score of 6.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2023-52447?

    Yes. CVE-2023-52447 has been patched. Fixed versions include 5.10.214, 5.15.153, 6.1.75 and others. If you are running Linux kernel 5.9 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2023-52447 actively exploited?

    No. CVE-2023-52447 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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