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Linux Kernel CVE-2026-53315

| EUVDEUVD-2026-39850 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-06-26 Linux GHSA-43h2-vrg5-h3qp
Linux Amd Denial Of Service Null Pointer Dereference Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.5 MEDIUM

Local attack vector with low-privilege user required; impact is kernel panic only (Availability:High); no confidentiality or integrity effect applies to this DoS-only NULL deref.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.5 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jul 06, 2026 - 20:41 vuln.today
CVSS changed
Jul 06, 2026 - 20:22 NVD
5.5 (MEDIUM)
Patch available
Jun 26, 2026 - 21:02 EUVD
CVE Published
Jun 26, 2026 - 19:41 nvd
MEDIUM 5.5
CVE Published
Jun 26, 2026 - 19:41 cve.org
UNKNOWN (no severity yet)

DescriptionNVD

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/ras: Fix NULL deref in ras_core_get_utc_second_timestamp()

ras_core_get_utc_second_timestamp() retrieves the current UTC timestamp (in seconds since the Unix epoch) through a platform-specific RAS system callback and is used for timestamping RAS error events.

The function checks ras_core in the conditional statement before calling the sys_fn callback. However, when the condition fails, the function prints an error message using ras_core->dev.

If ras_core is NULL, this can lead to a potential NULL pointer dereference when accessing ras_core->dev.

Add an early NULL check for ras_core at the beginning of the function and return 0 when the pointer is not valid. This prevents the dereference and makes the control flow clearer.

AnalysisAI

NULL pointer dereference in the Linux kernel's drm/amd/ras subsystem allows a local low-privileged user to crash the kernel on systems with AMD GPUs. The flaw in ras_core_get_utc_second_timestamp() occurs when a NULL ras_core pointer passes a conditional check but is then dereferenced in the subsequent error-printing path, producing a kernel panic. No public exploit exists and EPSS sits at 0.15% (4th percentile), placing this firmly as a low-urgency local denial-of-service hardening issue despite the Availability:High CVSS rating.

Technical ContextAI

The vulnerable function ras_core_get_utc_second_timestamp() lives in the Direct Rendering Manager (DRM) AMD RAS (Reliability, Availability, Serviceability) driver, which timestamps hardware error events from AMD GPUs for RAS error tracking. CWE-476 (NULL Pointer Dereference) precisely describes the root cause: the conditional guard on ras_core succeeds in blocking the sys_fn callback call, but the error-logging branch that follows immediately dereferences ras_core->dev without re-checking for NULL, creating a classic check-then-use defect. CPE cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:* confirms the affected product spans all Linux kernel versions prior to the fix commits, with the amdgpu module and its RAS subsystem as the required runtime context.

RemediationAI

Update to Linux kernel 7.0.10, 7.1, or 6.19 (per the applicable stable branch), which incorporate the fix commits available at https://git.kernel.org/stable/c/2b8101cc3b34d4d80d799360d2744829d5964479 and https://git.kernel.org/stable/c/6c84f7f0afc415691ffa7d48aa7ce1d8e6083032. For systems that cannot be patched immediately, restricting unprivileged user access to AMD GPU RAS sysfs interfaces via udev rules or removing CAP_SYS_ADMIN from untrusted processes reduces the attack surface, though this may impair AMD GPU error telemetry. Alternatively, blacklisting the amdgpu module eliminates the vulnerable code path entirely at the cost of GPU functionality. Systems without AMD GPUs or with amdgpu unloaded require no action.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected

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CVE-2026-53315 vulnerability details – vuln.today
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