CVE-2026-31458

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-31458
In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: check contexts->nr before accessing contexts_arr[0] Multiple sysfs command paths dereference contexts_arr[0] without first verifying that kdamond->contexts->nr == 1. A user can set nr_contexts to 0 via sysfs while DAMON is running, causing NULL pointer dereferences. In more detail, the issue can be triggered by privileged users like below. First, start DAMON and make contexts directory empty (kdamond->contexts->nr == 0). # damo start # cd /sys/kernel/mm/damon/admin/kdamonds/0 # echo 0 > contexts/nr_contexts Then, each of below commands will cause the NULL pointer dereference. # echo update_schemes_stats > state # echo update_schemes_tried_regions > state # echo update_schemes_tried_bytes > state # echo update_schemes_effective_quotas > state # echo update_tuned_intervals > state Guard all commands (except OFF) at the entry point of damon_sysfs_handle_cmd().

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/1bfe9fb5ed2667fb075682408b776b5273162615 Patch
https://git.kernel.org/stable/c/1e8da792672481d603fa7cd0d815577220a3ee27 Patch
https://git.kernel.org/stable/c/708033c231bd782858f4ddbb46ee874a5a5fbdab Patch
https://git.kernel.org/stable/c/aba546061341b56e9ffb37e1eb661a3628b6ec12 Patch
https://git.kernel.org/stable/c/bbe03ad3fb9e714191757ca7b41582f930be7be2 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
History

05 May 2026, 21:23

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
First Time Linux
Linux linux Kernel
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/1bfe9fb5ed2667fb075682408b776b5273162615 - () https://git.kernel.org/stable/c/1bfe9fb5ed2667fb075682408b776b5273162615 - Patch
References () https://git.kernel.org/stable/c/1e8da792672481d603fa7cd0d815577220a3ee27 - () https://git.kernel.org/stable/c/1e8da792672481d603fa7cd0d815577220a3ee27 - Patch
References () https://git.kernel.org/stable/c/708033c231bd782858f4ddbb46ee874a5a5fbdab - () https://git.kernel.org/stable/c/708033c231bd782858f4ddbb46ee874a5a5fbdab - Patch
References () https://git.kernel.org/stable/c/aba546061341b56e9ffb37e1eb661a3628b6ec12 - () https://git.kernel.org/stable/c/aba546061341b56e9ffb37e1eb661a3628b6ec12 - Patch
References () https://git.kernel.org/stable/c/bbe03ad3fb9e714191757ca7b41582f930be7be2 - () https://git.kernel.org/stable/c/bbe03ad3fb9e714191757ca7b41582f930be7be2 - Patch

22 Apr 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-22 14:16

Updated : 2026-06-05 17:36

NVD link : CVE-2026-31458

Mitre link : CVE-2026-31458

CVE.ORG link : CVE-2026-31458

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference