CVE-2026-74442
In the Linux kernel, the following vulnerability has been resolved:
drm/vmwgfx: avoid destroy_workqueue(NULL) on vkms init failure
Two paths through vmw_vkms_init() can leave vmw->crc_workq NULL while
still leaving the rest of the driver in a state that calls
vmw_vkms_cleanup() at module unload:
1. vmw_host_get_guestinfo(GUESTINFO_VBLANK, ...) failing or
returning an oversized buffer -- the common case on hosts
without a VBLANK guestinfo entry -- early-returned before the
workqueue allocation.
2. alloc_ordered_workqueue() returning NULL on memory pressure.
vmw_vkms_cleanup() then calls destroy_workqueue(NULL), which
dereferences wq->name and panics.
Fix the first case by removing the early return: vmw->vkms_enabled
is already false on the rpci-failure path so no work will ever be
queued, and allocating the workqueue unconditionally keeps the
control flow simple. Fix the second case by guarding the cleanup
with a NULL check, since alloc_ordered_workqueue() can still fail
under low memory.
CSIRTS triage
- What
- Multiple vulnerabilities in the Linux kernel that may result in privilege escalation, denial of service, or information disclosure.
- Who is affected
- Debian systems running vulnerable Linux kernel versions.
- Urgency
- Multiple kernel vulnerabilities enabling privilege escalation and information leaks require urgent patching to protect system and data security.
- Action
- Apply the Debian security update DSA-6466-1 to the Linux kernel immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Advisory coverage (2)
- unknownDSA-6466-1 linux - security updatedebian · 2026-08-25
- unknownCVE-2026-74442: In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: avoid destroy_…nvd · 2026-08-15
External references
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