CVE-2026-45838

Severity CVSS v4.0:

Pending analysis

Type:

CWE-476 NULL Pointer Dereference

Publication date:

27/05/2026

Last modified:

26/06/2026

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix end-of-list detection in cgroup_storage_get_next_key() list_next_entry() never returns NULL -- when the current element is the last entry it wraps to the list head via container_of(). The subsequent NULL check is therefore dead code and get_next_key() never returns -ENOENT for the last element, instead reading storage->key from a bogus pointer that aliases internal map fields and copying the result to userspace. Replace it with list_entry_is_head() so the function correctly returns -ENOENT when there are no more entries.

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::::::::	4.19 (including)	5.10.258 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.15.209 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.16 (including)	6.1.175 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2 (including)	6.6.141 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.7 (including)	6.12.91 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.13 (including)	6.18.33 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.19 (including)	7.0.10 (excluding)

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

CVE-2026-45838

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools