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Fencer Vulns
high 7.8

CVE-2026-64098 json

drm/virtio: use uninterruptible resv lock for plane updates

published 2026-07-19 3 mo ago modified 2026-10-19 20 d ago also EUVD-2026-45783

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

drm/virtio: use uninterruptible resv lock for plane updates

virtio_gpu_cursor_plane_update() and virtio_gpu_resource_flush() lock the framebuffer BO's dma_resv via virtio_gpu_array_lock_resv() and ignore its return value. The function can fail with -EINTR from dma_resv_lock_interruptible() (signal during lock wait) or with -ENOMEM from dma_resv_reserve_fences() (fence slot allocation), leaving the resv lock not held. The queue path then walks the object array and calls dma_resv_add_fence(), which requires the lock held; with lockdep enabled this trips dma_resv_assert_held():

WARNING: drivers/dma-buf/dma-resv.c:296 at dma_resv_add_fence+0x71e/0x840 Call Trace: virtio_gpu_array_add_fence virtio_gpu_queue_ctrl_sgs virtio_gpu_queue_fenced_ctrl_buffer virtio_gpu_cursor_plane_update drm_atomic_helper_commit_planes drm_atomic_helper_commit_tail commit_tail drm_atomic_helper_commit drm_atomic_commit drm_atomic_helper_update_plane __setplane_atomic drm_mode_cursor_universal drm_mode_cursor_common drm_mode_cursor_ioctl drm_ioctl __x64_sys_ioctl

Beyond the WARN, mutating the dma_resv fence list without the lock races with concurrent readers/writers and can corrupt the list.

Both call sites run inside the .atomic_update plane callback, which DRM atomic helpers do not allow to fail (by the time it runs, the commit has been signed off to userspace and there is no clean rollback path). Moving the lock acquisition to .prepare_fb was rejected because the broader lock scope deadlocks against other BO locking paths in the same atomic commit.

Introduce virtio_gpu_lock_one_resv_uninterruptible() that uses dma_resv_lock() instead of dma_resv_lock_interruptible(). This eliminates the -EINTR failure mode -- the realistic syzbot trigger -- without extending the lock hold across the commit. The helper locks a single BO and rejects nents > 1 with -EINVAL; both fix sites lock exactly one BO.

Use it from virtio_gpu_cursor_plane_update() and virtio_gpu_resource_flush(); check the return value to handle the remaining -ENOMEM case from dma_resv_reserve_fences() by freeing the objs and skipping the plane update for that frame. The framebuffer BOs touched here are not shared with other contexts and lock contention is expected to be brief, so the loss of signal-interruptibility is acceptable.

Other callers of virtio_gpu_array_lock_resv() (the ioctl paths) continue to use the interruptible variant.

The bug was reported by syzbot, triggered via fault injection (fail_nth) on the DRM_IOCTL_MODE_CURSOR path, which forces the -ENOMEM branch in dma_resv_reserve_fences().

Patch / fix

  • Linux Linux 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1
  • linux Debian 12 6.1.176-1
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.12-1

debian advisories DEBIAN-CVE-2026-64098

  • linux Ubuntu 24.04 LTS 6.8.0-139.139
  • linux Ubuntu 26.04 LTS 7.0.0-28.28
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1064.67
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1009.9
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1067.75
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1008.8
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1062.70
  • linux-gke Ubuntu 26.04 LTS 7.0.0-1003.4

ubuntu advisories UBUNTU-CVE-2026-64098

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-687.52.1.el9_8
  • rv RHEL 9 5.14.0-687.52.1.el9_8
  • perf RHEL 9 5.14.0-687.52.1.el9_8
  • rtla RHEL 9 5.14.0-687.52.1.el9_8
  • libperf RHEL 9 5.14.0-687.52.1.el9_8
  • kernel-rt RHEL 9 5.14.0-687.52.1.el9_8
  • kernel-64k RHEL 9 5.14.0-687.52.1.el9_8
  • kernel-core RHEL 9 5.14.0-687.52.1.el9_8

red hat advisories RHSA-2026:71700RHSA-2026:71602

  • kernel-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.189.1
  • kernel-syms SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.189.1
  • kernel-source SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.189.1
  • kernel-default SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +3 more 5.14.21-150500.55.189.1
  • kernel-obs-build SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.189.1
  • kernel-default-base SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.189.1.150500.6.87.4
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.81.1

suse advisories SUSE-SU-2026:4595-1SUSE-SU-2026:4254-1SUSE-SU-2026:4369-1SUSE-SU-2026:4347-1SUSE-SU-2026:4284-1SUSE-SU-2026:23887-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.38.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.38.1

opensuse advisories openSUSE-SU-2026:21910-1

  • kernel AlmaLinux 9 5.14.0-687.52.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.52.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.52.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.52.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.52.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.52.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.52.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.52.1.el9_8

almalinux advisories ALSA-2026:71700ALSA-2026:71602

  • kernel Rocky Linux 10 6.12.0-211.60.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.52.1.el9_8

rocky linux advisories RLSA-2026:71602RLSA-2026:71700

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-64098 updated cvss 4.7

kernel: drm/virtio: use uninterruptible resv lock for plane updates

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.52.1.el9_8, perf 5.14.0-687.52.1.el9_8, rtla 5.14.0-687.52.1.el9_8, python3-perf 5.14.0-687.52.1.el9_8, kernel-devel-matched 5.14.0-687.52.1.el9_8, kernel-64k-devel-matched 5.14.0-687.52.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:71700
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.60.1.el10_2, perf 6.12.0-211.60.1.el10_2, rtla 6.12.0-211.60.1.el10_2, python3-perf 6.12.0-211.60.1.el10_2, kernel-devel-matched 6.12.0-211.60.1.el10_2, kernel-64k-devel-matched 6.12.0-211.60.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:71602
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.52.1.el9_8, kernel-64k 5.14.0-687.52.1.el9_8, kernel-core 5.14.0-687.52.1.el9_8, kernel-tools 5.14.0-687.52.1.el9_8, kernel-modules 5.14.0-687.52.1.el9_8, kernel-64k-core 5.14.0-687.52.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:71700
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.60.1.el10_2, kernel-64k 6.12.0-211.60.1.el10_2, kernel-core 6.12.0-211.60.1.el10_2, kernel-tools 6.12.0-211.60.1.el10_2, kernel-modules 6.12.0-211.60.1.el10_2, kernel-64k-core 6.12.0-211.60.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:71602
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.52.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.52.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.52.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.52.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.52.1.el9_8
    fixed: vendor fix RHSA-2026:71700
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.60.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.60.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.60.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.60.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.60.1.el10_2
    fixed: vendor fix RHSA-2026:71602
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.52.1.el9_8, kernel-rt-64k 5.14.0-687.52.1.el9_8, kernel-rt-core 5.14.0-687.52.1.el9_8, kernel-rt-modules 5.14.0-687.52.1.el9_8, kernel-rt-64k-core 5.14.0-687.52.1.el9_8, kernel-rt-debug-core 5.14.0-687.52.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:71700
show 4 more
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.60.1.el10_2, kernel-rt-64k 6.12.0-211.60.1.el10_2, kernel-rt-core 6.12.0-211.60.1.el10_2, kernel-rt-modules 6.12.0-211.60.1.el10_2, kernel-rt-64k-core 6.12.0-211.60.1.el10_2, kernel-rt-debug-core 6.12.0-211.60.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:71602
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.52.1.el9_8, kernel-rt-core 5.14.0-687.52.1.el9_8, kernel-rt-modules 5.14.0-687.52.1.el9_8, kernel-rt-debug-core 5.14.0-687.52.1.el9_8, kernel-rt-modules-core 5.14.0-687.52.1.el9_8, kernel-rt-debug-modules 5.14.0-687.52.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:71700
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.60.1.el10_2, kernel-rt-core 6.12.0-211.60.1.el10_2, kernel-rt-modules 6.12.0-211.60.1.el10_2, kernel-rt-debug-core 6.12.0-211.60.1.el10_2, kernel-rt-modules-core 6.12.0-211.60.1.el10_2, kernel-rt-debug-modules 6.12.0-211.60.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:71602
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
23 d ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
  • CWE-667 Improper Locking
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.