EUVD-2026-64583
GHSA-487q-3fxv-jwrm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Race condition requires precise concurrent signal delivery and mmap timing, warranting AC:H over AC:L; PR:L reflects required FastRPC device node access permission.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke
When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.
Take fl->lock around the move, matching every other fl->mmaps accessor.
AnalysisAI
Unprotected list manipulation in the Linux kernel FastRPC subsystem allows a local low-privileged attacker on Qualcomm-based systems to race a signal-interrupted DSP invoke operation against concurrent mmap/munmap operations. The missing fl->lock acquisition in fastrpc_internal_invoke() during the interrupt path creates a concurrent modification hazard on fl->mmaps, potentially yielding kernel memory corruption with full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local shell access on a Linux system with the FastRPC kernel module loaded - this module is present only on Qualcomm-based hardware such as Snapdragon SoCs and Qualcomm DSP-equipped embedded platforms. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 High (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a local, low-privilege attack path with potentially severe kernel-level impact, but the AC:L rating understates real exploitation difficulty: the race condition requires delivering a signal to a thread precisely while blocked in `wait_for_completion_interruptible()` with a concurrent mmap/munmap operation in flight - a timing-dependent condition more accurately reflected by AC:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local attacker with a low-privilege shell on a Qualcomm-based Linux system opens a FastRPC channel and initiates a DSP invoke call, then sends a signal to the invoking thread precisely while it is blocked in `wait_for_completion_interruptible()`, while a second thread concurrently calls `fastrpc_req_mmap()` or `fastrpc_req_munmap()`. The competing `list_del()`/`list_add_tail()` operations without `fl->lock` cause linked-list corruption in kernel memory, potentially enabling a use-after-free or arbitrary kernel write primitive for privilege escalation. … |
| Remediation | The primary fix is upgrading to a patched kernel version: 6.6.152, 6.12.104, 6.18.45, 7.1.9, or 7.2. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Qualcomm-based Linux systems in production, identify which kernels are affected per vendor advisory, and assess local user access scope. …
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