CVE-2026-43333

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-43333
In the Linux kernel, the following vulnerability has been resolved: bpf: reject direct access to nullable PTR_TO_BUF pointers check_mem_access() matches PTR_TO_BUF via base_type() which strips PTR_MAYBE_NULL, allowing direct dereference without a null check. Map iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL. On stop callbacks these are NULL, causing a kernel NULL dereference. Add a type_may_be_null() guard to the PTR_TO_BUF branch, matching the existing PTR_TO_BTF_ID pattern.

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/10bc4a4dcded509c5d5c67d497900c3922c604cd Patch
https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56 Patch
https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 Patch
https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0 Patch
https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535 Patch
https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252 Patch
https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3 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:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
History

15 May 2026, 20:07

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cd - () https://git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cd - Patch
References () https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56 - () https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56 - Patch
References () https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 - () https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 - Patch
References () https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0 - () https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0 - Patch
References () https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535 - () https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535 - Patch
References () https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252 - () https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252 - Patch
References () https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3 - () https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3 - Patch

08 May 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-08 14:16

Updated : 2026-05-15 20:07

NVD link : CVE-2026-43333

Mitre link : CVE-2026-43333

CVE.ORG link : CVE-2026-43333

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference