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CVE-2022-49699

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
26/02/2025
Last modified:
24/10/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> filemap: Handle sibling entries in filemap_get_read_batch()<br /> <br /> If a read races with an invalidation followed by another read, it is<br /> possible for a folio to be replaced with a higher-order folio. If that<br /> happens, we&amp;#39;ll see a sibling entry for the new folio in the next iteration<br /> of the loop. This manifests as a NULL pointer dereference while holding<br /> the RCU read lock.<br /> <br /> Handle this by simply returning. The next call will find the new folio<br /> and handle it correctly. The other ways of handling this rare race are<br /> more complex and it&amp;#39;s just not worth it.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.12 (including) 5.18.8 (excluding)
cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc3:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools