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CVE-2026-98156— drm/virtio: use the DMA API for resource backing on Xen

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，以下漏洞已得到解决： drm/virtio：在 Xen 环境中使用 DMA API 管理资源后端（backing） 在 Xen PV（半虚拟化）客户域（domU）中，页面地址与主机（host）实际用于访问这些内存的物理地址之间没有直接对应关系。 正确地处理了这种情况： 函数对于任何 Xen 域（ ）都返回 ，而不受 特性位的影响。 驱动也独立地做出了相同的判断，但其实现仅检查特性位： 由于 QEMU 默认未为 设备设置 属性，因此 特性未被协商启用，导致 为 。结果， 使用 向主机描述帧缓冲

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux a3b815f09bb846255c458c181b8a5b1cc66891b4< 93c557e947ef0040004b1ac6a1c1265d79a957e1 affected
a3b815f09bb846255c458c181b8a5b1cc66891b4< 455184dbe9652d01470d3c5cf5edd09a7a673a99 affected
a3b815f09bb846255c458c181b8a5b1cc66891b4< 6a736d2f9d0c6e6217fe7532bc4c50ceca71db78 affected
4.20 affected
< 4.20 unaffected
6.18.53≤ 6.18.* unaffected
7.2.7≤ 7.2.* unaffected
7.3-rc2≤ * unaffected
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I. Basic Information for CVE-2026-98156

Vulnerability Information
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Vulnerability Title
drm/virtio: use the DMA API for resource backing on Xen
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/virtio: use the DMA API for resource backing on Xen On a Xen PV domain page addresses bear no relation to the real machine addresses the host would have to use to reach it. virtio_ring.c handles this correctly, vring_use_map_api() returns true for any xen_domain() regardless of VIRTIO_F_ACCESS_PLATFORM. virtio-gpu makes the same decision independently, but its copy looks only at the feature bit: bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev); QEMU does not set iommu_platform on virtio-vga by default, so VIRTIO_F_ACCESS_PLATFORM is not negotiated, use_dma_api is false, and virtio_gpu_object_shmem_init() describes the framebuffer's backing pages to the host with sg_phys(). Those are guest-physical addresses. In a PV domain they resolve, on the host side, to pages belonging to some other domain, so the host scans out unrelated memory. Move the decision into virtio_gpu_use_dma_api() and give it the xen_domain() check, like vring_use_map_api() has. This additionally enables the dma_sync_sgtable_for_device() calls in virtgpu_vq.c, which are required for correctness whenever swiotlb is in play. Reproduced with a Xen 4.21 PV dom0 nested inside QEMU 8.2 with virtio-vga, on both a distro 6.8 kernel and 6.18 LTS. A PVH dom0 works fine and doesn't need this fix because it is identity-mapped, only PV dom0s are affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/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 a3b815f09bb846255c458c181b8a5b1cc66891b4 ~ 93c557e947ef0040004b1ac6a1c1265d79a957e1 -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-98156

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III. Intelligence Information for CVE-2026-98156

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Patches & Fixes for CVE-2026-98156 (3)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop
CVE-2026-97991 7.8 HIGH vdpa_sim_blk: reject out-of-range sector starts
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-97612 7.8 HIGH net: mpls: clear inner_protocol when the last label is popped
CVE-2026-97594 7.8 HIGH landlock: Fix use-after-free of the source's parent directory
CVE-2026-97611 7.8 HIGH net: openvswitch: fix use-after-free of the flow table mask array
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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