Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-22991

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
23/01/2026
Last modified:
26/02/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> libceph: make free_choose_arg_map() resilient to partial allocation<br /> <br /> free_choose_arg_map() may dereference a NULL pointer if its caller fails<br /> after a partial allocation.<br /> <br /> For example, in decode_choose_args(), if allocation of arg_map-&gt;args<br /> fails, execution jumps to the fail label and free_choose_arg_map() is<br /> called. Since arg_map-&gt;size is updated to a non-zero value before memory<br /> allocation, free_choose_arg_map() will iterate over arg_map-&gt;args and<br /> dereference a NULL pointer.<br /> <br /> To prevent this potential NULL pointer dereference and make<br /> free_choose_arg_map() more resilient, add checks for pointers before<br /> iterating.

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:*:*:*:*:*:*:*:* 4.13 (including) 5.10.248 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.198 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.161 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.6.121 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.66 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.18.6 (excluding)
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools