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In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4
This commit simplifies the amdgpu_gem_va_ioctl function, key updates include: - Moved the logic for managing the last update fence directly into amdgpu_gem_va_update_vm. - Introduced checks for the timeline point to enable conditional replacement or addition of fences.
v2: Addressed review comments from Christian. v3: Updated comments (Christian). v4: The previous version selected the fence too early and did not manage its reference correctly, which could lead to stale or freed fences being used. This resulted in refcount underflows and could crash when updating GPU timelines. The fence is now chosen only after the VA mapping work is completed, and its reference is taken safely. After exporting it to the VM timeline syncobj, the driver always drops its local fence reference, ensuring balanced refcounting and avoiding use-after-free on dma_fence.
Crash signature: [ 205.828135] refcount_t: underflow; use-after-free. [ 205.832963] WARNING: CPU: 30 PID: 7274 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110 ... [ 206.074014] Call Trace: [ 206.076488] <TASK> [ 206.078608] amdgpu_gem_va_ioctl+0x6ea/0x740 [amdgpu] [ 206.084040] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu] [ 206.089994] drm_ioctl_kernel+0x86/0xe0 [drm] [ 206.094415] drm_ioctl+0x26e/0x520 [drm] [ 206.098424] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu] [ 206.104402] amdgpu_drm_ioctl+0x4b/0x80 [amdgpu] [ 206.109387] __x64_sys_ioctl+0x96/0xe0 [ 206.113156] do_syscall_64+0x66/0x2d0 ... [ 206.553351] BUG: unable to handle page fault for address: ffffffffc0dfde90 ... [ 206.553378] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0 ... [ 206.553405] Call Trace: [ 206.553409] <IRQ> [ 206.553415] ? __pfx_drm_sched_fence_free_rcu+0x10/0x10 [gpu_sched] [ 206.553424] dma_fence_signal+0x30/0x60 [ 206.553427] drm_sched_job_done.isra.0+0x123/0x150 [gpu_sched] [ 206.553434] dma_fence_signal_timestamp_locked+0x6e/0xe0 [ 206.553437] dma_fence_signal+0x30/0x60 [ 206.553441] amdgpu_fence_process+0xd8/0x150 [amdgpu] [ 206.553854] sdma_v4_0_process_trap_irq+0x97/0xb0 [amdgpu] [ 206.554353] edac_mce_amd(E) ee1004(E) [ 206.554270] amdgpu_irq_dispatch+0x150/0x230 [amdgpu] [ 206.554702] amdgpu_ih_process+0x6a/0x180 [amdgpu] [ 206.555101] amdgpu_irq_handler+0x23/0x60 [amdgpu] [ 206.555500] __handle_irq_event_percpu+0x4a/0x1c0 [ 206.555506] handle_irq_event+0x38/0x80 [ 206.555509] handle_edge_irq+0x92/0x1e0 [ 206.555513] __common_interrupt+0x3e/0xb0 [ 206.555519] common_interrupt+0x80/0xa0 [ 206.555525] </IRQ> [ 206.555527] <TASK> ... [ 206.555650] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0 ... [ 206.555667] Kernel panic - not syncing: Fatal exception in interrupt
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-rt-64k-modules-coreUpgrade kernel-64k-coreUpgrade kernel-64k-debug-devel-matchedUpgrade kernel-toolsUpgrade kernel-cross-headersUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-tools-libsUpgrade kernel-zfcpdump-modulesUpgrade kernel-uki-virt-addonsUpgrade kernel-zfcpdumpUpgrade kernel-rt-64k-debugUpgrade kernel-rt-debug-develUpgrade kernel-debug-modules-extraUpgrade kernel-modules-coreUpgrade kernel-modules-extraUpgrade kernel-64k-devel-matchedUpgrade kernel-64k-debug-coreUpgrade kernel-rt-modules-coreUpgrade kernel-rt-debug-modulesUpgrade kernel-64k-modulesUpgrade kernel-rt-64k-develUpgrade kernel-zfcpdump-develUpgrade kernel-rt-64k-debug-modulesUpgrade kernel-abi-stablelistsUpgrade kernel-rt-64k-coreUpgrade kernel-debug-modulesUpgrade kernel-64k-debug-modules-extraUpgrade kernel-rt-debug-coreUpgrade kernelUpgrade kernel-64k-debugUpgrade kernel-debug-devel-matchedUpgrade kernel-coreUpgrade kernel-debug-modules-coreUpgrade rvUpgrade kernel-rt-modules-extraUpgrade kernel-rtUpgrade kernel-64k-develUpgrade kernel-headersUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-64kUpgrade kernel-modulesUpgrade kernel-64kUpgrade kernel-rt-64k-modulesUpgrade kernel-develUpgrade kernel-64k-debug-modulesUpgrade rtlaUpgrade kernel-rt-64k-debug-develUpgrade kernel-64k-modules-coreUpgrade kernel-debugUpgrade libperfUpgrade python3-perfUpgrade kernel-uki-virtUpgrade kernel-rt-coreUpgrade kernel-debug-develUpgrade perfUpgrade kernel-64k-debug-develUpgrade kernel-tools-libs-develUpgrade kernel-64k-debug-modules-coreUpgrade kernel-rt-debugUpgrade kernel-debug-coreUpgrade kernel-docUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-64k-debug-coreUpgrade kernel-64k-modules-extraUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-rt-modulesUpgrade kernel-rt-develUpgrade kernel-rt-64k-debug-modules-extraUpgrade kernel-rt-debug-modules-coreUpgrade kernel-debug-uki-virtUpgrade kernel-rt-64k-debug-modules-coreUpgrade kernel-rt-debug-modules-extraUpgrade kernel-devel-matchedUpgrade kernel-rt-64k-modules-extra | Oct 11, 2026 | Aug 20, 2026 |
| Oracle_linux | — | Upgrade kernel | Oct 22, 2026 | May 6, 2026 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | Aug 4, 2026 | May 6, 2026 |
| Rocky_linux | — | Upgrade kernel-develUpgrade python3-perfUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-rt-debug-develUpgrade kernel-rt-debug-coreUpgrade kernel-modules-coreUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-debug-uki-virtUpgrade kernel-rt-coreUpgrade kernel-rt-modules-extraUpgrade kernel-zfcpdump-develUpgrade kernel-tools-debuginfoUpgrade rtlaUpgrade kernel-zfcpdump-debuginfoUpgrade kernel-debug-modulesUpgrade kernel-rt-debug-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-debug-devel-matchedUpgrade kernel-devel-matchedUpgrade kernel-debugUpgrade kernel-debug-develUpgrade kernel-debug-coreUpgrade kernel-toolsUpgrade kernel-zfcpdump-modulesUpgrade perf-debuginfoUpgrade kernel-zfcpdump-modules-coreUpgrade kernel-debuginfo-common-s390xUpgrade kernel-zfcpdump-devel-matchedUpgrade kernel-uki-virt-addonsUpgrade kernel-debug-modules-coreUpgrade kernel-rt-develUpgrade libperf-debuginfoUpgrade kernel-rt-debugUpgrade kernel-coreUpgrade perfUpgrade libperfUpgrade kernel-uki-virtUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-debug-modules-coreUpgrade kernel-debug-debuginfoUpgrade rvUpgrade kernel-rt-modules-coreUpgrade kernel-rt-debuginfoUpgrade kernel-debug-modules-extraUpgrade kernel-rt-modulesUpgrade kernel-rtUpgrade kernel-modulesUpgrade kernel-zfcpdumpUpgrade kernel-tools-libs-develUpgrade kernel-modules-extraUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-debug-modules-extra | Aug 24, 2026 | Aug 21, 2026 |
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