EUVD-2026-39304
GHSA-3886-873f-6xpf
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AC:H because exploitation requires krealloc() failure under memory pressure, a non-default condition; A:L for gradual incremental leak rather than immediate denial of service.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
drm/vc4: fix krealloc() memory leak
Don't just overwrite the original pointer passed to krealloc() with its return value without checking latter:
MEM = krealloc(MEM, SZ, GFP);
If krealloc() returns NULL, that erases the pointer to the still allocated memory, hence leaks this memory. Instead, use a temporary variable, check it's not NULL and only then assign it to the original pointer:
TMP = krealloc(MEM, SZ, GFP); if (!TMP) return; MEM = TMP;
While on it, use krealloc_array().
AnalysisAI
Memory leak in the Linux kernel's drm/vc4 (Broadcom VideoCore IV DRM) driver allows a local low-privileged user to gradually exhaust kernel memory under allocation-failure conditions. The flaw arises because the return value of krealloc() is assigned directly back to the original pointer without a NULL check - if krealloc() fails and returns NULL, the reference to the previously allocated buffer is silently overwritten, permanently leaking that memory. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) local authenticated access to the target system with at least low-privilege credentials (CVSS PR:L); (2) the target system must have Broadcom VideoCore IV GPU hardware present (e.g., Raspberry Pi) with the drm/vc4 kernel module loaded; (3) system must be under sufficient memory pressure that krealloc() returns NULL - this is a transient kernel-internal condition not reliably triggered by normal user-space operations. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is low-to-moderate despite the CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local unprivileged user on a Raspberry Pi system triggers repeated DRM/KMS operations through the vc4 driver while the system is under memory pressure, causing krealloc() to return NULL in the affected code path. Each such failure leaks a kernel heap buffer whose size is determined by the GPU memory allocation request, and over time the accumulated leaks degrade available kernel memory, potentially destabilizing long-running systems or contributing to OOM conditions. … |
| Remediation | Apply the vendor-released patches for the relevant stable branch: Linux 5.15.210, 6.1.176, 6.6.143, 6.12.94, 7.0.13, 6.18.36, or 7.1 (final release). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-401 – Memory Leak
View allSame technique Information Disclosure
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External POC / Exploit Code
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