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CVE-2026-98510— drm/xe/vm: nuke PTs only after unlinking contested VMAs

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： drm/xe/vm：仅在解除争用 VMA 的链接后，再销毁页表（PT）在函数中，外部缓冲对象（external-BO）的 VMA 会被加入“争用列表”（contested list），以便通过进行延迟销毁。然而，此前会在处理这些争用 VMA 之前就被调用，导致被销毁，而此时这些 VMA 仍与其对应的缓冲对象（）保持链接。如果此时有并发线程驱逐了其中一个共享缓冲对象，在仅持有锁的情况下会遍历该缓冲对象的 VMA；在缺页故障（fault）模式下，它会调用

CVSS 7.8 · High EPSS 0.17% · P6 Updated Oct 24, 2026

Possible ATT&CK Techniques 1 AI

T1068.001

Affected Version Matrix 10

Vendor	Product	Version Range	Status
Linux	Linux	`b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc< 70fddc065ac80845ffd33095b3635d59883cf7e6`	affected
		`b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc< ba678c2b02e0d36b53deb5a6d5e5ea044d36def7`	affected
		`b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc< bddaa5e4094c134452c29e20a26c4718827e4cb1`	affected
		`b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc< 24a22fb3c731474b68e986af6804db450fb88617`	affected
		`6.8`	affected
		`< 6.8`	unaffected
		`6.12.112≤ 6.12.*`	unaffected
		`6.18.55≤ 6.18.*`	unaffected
… +2 more rows

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Vulnerability Information

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Vulnerability Title

drm/xe/vm: nuke PTs only after unlinking contested VMAs

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/xe/vm: nuke PTs only after unlinking contested VMAs In xe_vm_close_and_put(), external-BO VMAs are queued on the contested list for deferred destruction via xe_vma_destroy_unlocked(). However, xe_vm_pt_destroy() was previously invoked before processing contested VMAs, destroying vm->pt_root while those VMAs were still linked to their respective buffer objects (vm_bo->list.gpuva). If a concurrent thread evicts one of those shared buffer objects, xe_bo_trigger_rebind() holding only bo->resv walks the BO's VMAs and, in fault mode, calls xe_vm_invalidate_vma() -> xe_pt_zap_ptes(). Because vm->pt_root[tile->id] is already NULL, dereferencing pt->level causes a NULL ptr deref. Fix this by deferring xe_vm_free_scratch() and xe_vm_pt_destroy() until after all contested VMAs have been unlinked and destroyed. User is reporting hitting a NULL ptr deref in xe_pt_zap_ptes(), which could be explained by this race. (cherry picked from commit c2863648959489767f08892fd6e90577d2ea0b6a)

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc ~ 70fddc065ac80845ffd33095b3635d59883cf7e6	-
Linux	Linux	6.8	-

II. Public POCs for CVE-2026-98510

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-98510

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Patches & Fixes for CVE-2026-98510 (3)

https://www.cve.org/CVERecord?id=CVE-2026-98510

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98548	9.8 CRITICAL	sctp: discard the rest of the packet on a stale-cookie error
CVE-2026-98490	9.8 CRITICAL	net: openvswitch: conntrack: fix helper UAF due to extensions realloc
CVE-2026-98464	9.3 CRITICAL	RISC-V: KVM: Synchronize hrtimer callback during teardown
CVE-2026-98549	9.1 CRITICAL	tcp: prevent collapsing skbs across boundary in rtx queue
CVE-2026-98451	8.8 HIGH	smb: client: use finish_no_open() for non-regular inodes
CVE-2026-98466	8.2 HIGH	KVM: arm64: Transfer the hyp stack pages out of the host stage-2
CVE-2026-98532	8.1 HIGH	ipv6: do not let ipv6_find_hdr() return an offset past the packet end
CVE-2026-98454	8.1 HIGH	smb: client: fix create context out-of-bounds reads
CVE-2026-98499	8.1 HIGH	HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()
CVE-2026-98443	7.8 HIGH	xfs: fix cursor and pointer handling when recovering iunlink buckets
CVE-2026-98436	7.8 HIGH	accel/amdxdna: Disable device buffer exporting
CVE-2026-98515	7.8 HIGH	drm/nouveau: fix double-free in nvif_vmm_dtor
CVE-2026-98507	7.8 HIGH	mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish
CVE-2026-98442	7.8 HIGH	net/sched: act_ct: fix helper UAF due to extensions realloc
CVE-2026-98524	7.8 HIGH	rds: ib: Clear the sg list when mapping an MR fails
CVE-2026-98487	7.8 HIGH	net: bridge: mdb: restart port group walk after deletion
CVE-2026-98520	7.8 HIGH	drm/amdkfd: fix use-after-free and multi-container gap in kfd_dev_mapping
CVE-2026-98441	7.8 HIGH	net/sched: act_ct: avoid modifying shared unconfirmed ct entry
CVE-2026-98517	7.8 HIGH	drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM
CVE-2026-98491	7.8 HIGH	net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry

Showing top 20 of 435 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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Same vendor: Linux