EUVD-2026-76459
GHSA-3g7j-4hj7-8rgc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Race condition between async delayed_work and synchronous teardown warrants AC:H; PR:L reflects minimum unprivileged namespace creation capability required.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
6DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: always drain cache_cleaner before destroying a cache_detail
sunrpc_destroy_cache_detail() only cancels the global cache_cleaner delayed_work when cache_list is empty. During per-netns teardown cache_list is never empty because init_net's caches remain registered, so the cancel never fires. After unlink, the caller proceeds to cache_destroy_net() which kfrees the cache_detail while cache_clean() may still hold a dangling pointer to it. The result is a use-after-free: cache_dequeue() takes cd->queue_lock on freed memory, and cache_put() dereferences cd->cache_put as a function pointer from freed slab.
Drop the list_empty guard so that cancel_delayed_work_sync() always runs, ensuring any in-flight cache_clean() completes before the cache_detail is freed. Re-arm the cleaner afterwards if other caches are still registered.
AnalysisAI
Use-after-free in the Linux kernel SUNRPC cache management subsystem allows a local low-privileged user to potentially achieve kernel code execution or crash the system. The bug exists in sunrpc_destroy_cache_detail(), which skips cancel_delayed_work_sync() when cache_list is non-empty - a condition that is permanently true during per-netns teardown - leaving cache_clean() with a dangling pointer to the already-freed cache_detail structure. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local shell access with at least low-privilege execution (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 vector (AV:L/AC:L/PR:L) is directionally correct but slightly optimistic on complexity: the UAF is triggered by a race between asynchronous `cache_clean()` and synchronous teardown, which implies a timing dependency that AC:H better reflects. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to a patched Linux kernel: 6.12.109, 6.18.50, 7.2.4, or 7.3-rc1 via the fix commits published at git.kernel.org/stable. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, determine which Linux systems in your infrastructure are vulnerable and catalog those with direct local user access or untrusted workloads. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Share
External POC / Exploit Code
Leaving vuln.today