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CVE-2026-80888— drm/vmwgfx: drop dma_buf reference on foreign-fd prime import

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于drm/vmwgfx的ttm_prime_fd_to_handle函数在导入外部fd的dma_buf操作不匹配时未释放dma_buf引用，无特权renderD客户端可通过DRM_VMW_GB_SURFACE_REF路径传递非vmwgfx prime fd，导致每次调用泄漏一个dma_buf引用并无限期固定外部导出器的GEM资源。

AI Predicted 5.3 Difficulty: Hard EPSS 0.18% · P8

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 65981f7681abdf92b25942222b629b9c512d0705< 1715901e7052cf90fbf04c8303e563a47e021278 affected
65981f7681abdf92b25942222b629b9c512d0705< c4fd91ee7228f56fbb4cf528757dc17ffefeb0ee affected
65981f7681abdf92b25942222b629b9c512d0705< 619c3cfa88e09603a13d918f754808db2dda7057 affected
65981f7681abdf92b25942222b629b9c512d0705< c1c22fca0a0896a452a7cb92422d67babd65b4be affected
65981f7681abdf92b25942222b629b9c512d0705< a1e972fa94c3a8069e022c67b9d97c7aa7b05293 affected
65981f7681abdf92b25942222b629b9c512d0705< a8434b145b1e467940334c58c00af241e9494c5f affected
65981f7681abdf92b25942222b629b9c512d0705< 4df39eb99bb47d1f24d1952c23b21b10988356bf affected
65981f7681abdf92b25942222b629b9c512d0705< f739416dc555fa205a785e5135d73fa39b26f35d affected
… +10 more rows
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I. Basic Information for CVE-2026-80888

Vulnerability Information
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Vulnerability Title
drm/vmwgfx: drop dma_buf reference on foreign-fd prime import
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: drop dma_buf reference on foreign-fd prime import ttm_prime_fd_to_handle() returns -ENOSYS when the imported fd's dma_buf->ops do not match the ttm_object_device's ops, but does so without releasing the reference acquired by dma_buf_get(). Any unprivileged renderD client passing a non-vmwgfx prime fd through the DRM_VMW_GB_SURFACE_REF{,_EXT} path leaks one dma_buf reference per call and indefinitely pins the foreign exporter's GEM resources. Funnel the error path through the existing dma_buf_put() so the reference is always dropped.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于drm/vmwgfx的ttm_prime_fd_to_handle函数在导入外部fd的dma_buf操作不匹配时未释放dma_buf引用，无特权renderD客户端可通过DRM_VMW_GB_SURFACE_REF路径传递非vmwgfx prime fd，导致每次调用泄漏一个dma_buf引用并无限期固定外部导出器的GEM资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 65981f7681abdf92b25942222b629b9c512d0705 ~ 1715901e7052cf90fbf04c8303e563a47e021278 -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-80888

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III. Intelligence Information for CVE-2026-80888

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Patches & Fixes for CVE-2026-80888 (8)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80854 usb: gadget: f_tcm: keep port count until LUN teardown completes
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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