EUVD-2026-38996
GHSA-gp4w-ghc6-9x53
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local-only trigger via DRBD admin interface requires low-privilege local access; no confidentiality or integrity impact, only kernel crash (A:H).
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:
drbd: Balance RCU calls in drbd_adm_dump_devices()
Make drbd_adm_dump_devices() call rcu_read_lock() before rcu_read_unlock() is called. This has been detected by the Clang thread-safety analyzer.
AnalysisAI
Kernel panic via RCU locking imbalance in the DRBD subsystem's drbd_adm_dump_devices() function affects Linux kernel versions from the introduction of commit a55bbd375d18 through multiple stable branches. A locally authenticated low-privilege user who can invoke DRBD administrative operations may trigger a kernel crash by exploiting the unbalanced rcu_read_unlock() call - called without a preceding rcu_read_lock() - leading to a denial-of-service via kernel instability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local, authenticated access to the target system with at least low-privilege user rights (consistent with PR:L in the CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) scores 5.5 medium, accurately reflecting the local, low-privilege trigger path with availability-only impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A locally authenticated user on a Linux system with the DRBD kernel module loaded invokes an administrative command (such as drbdadm dump-devices or a crafted netlink message targeting DRBD) that triggers drbd_adm_dump_devices(). The unbalanced rcu_read_unlock() call prematurely signals an RCU grace period, potentially causing the kernel to crash or enter an undefined state, resulting in a denial-of-service. … |
| Remediation | The primary fix is to upgrade the Linux kernel to a patched stable release: 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10, or 7.1 depending on the deployed branch. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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