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CVE-2026-74443— drm/vmwgfx: bound DMA command body size against suffix pointer

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 2.6.33版本存在安全漏洞，该漏洞源于vmw_cmd_dma()函数未检查DMA命令头部大小是否足够，导致后缀指针下溢，可能覆盖已验证字段，造成TOCTOU，允许一个命令重写另一个命令的GMR id、surface id等认证字段。

CVSS 8.8 · High EPSS 0.13% · P3

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4e4ddd47774313accc86b233d6ca2c6a9037a671< eb20f418933bea53375843b27b4022c1810be63b affected
4e4ddd47774313accc86b233d6ca2c6a9037a671< fcd1e56e7816b31a1050ccc67df722b20f6bb15d affected
4e4ddd47774313accc86b233d6ca2c6a9037a671< a4a37080a5ac777b59306cfcdf854cc05d7604d4 affected
4e4ddd47774313accc86b233d6ca2c6a9037a671< 036e16ada95389bdc30f41068af04c1d0872fad0 affected
4e4ddd47774313accc86b233d6ca2c6a9037a671< d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7 affected
4e4ddd47774313accc86b233d6ca2c6a9037a671< 7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6 affected
4e4ddd47774313accc86b233d6ca2c6a9037a671< 9759da60e38d7b9db44dc92713e4e0391883d221 affected
4e4ddd47774313accc86b233d6ca2c6a9037a671< f4f1db96bfd68b81053693ba53405b6f510ac16c affected
… +10 more rows
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I. Basic Information for CVE-2026-74443

Vulnerability Information
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Vulnerability Title
drm/vmwgfx: bound DMA command body size against suffix pointer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: bound DMA command body size against suffix pointer vmw_cmd_dma() locates the DMA suffix at (unsigned long) &cmd->body + header->size - sizeof(*suffix) without checking that header->size is large enough to contain both cmd->body and the suffix. An undersized header makes the suffix pointer underflow back into the previous command in the bounce buffer. The verifier later writes suffix->maximumOffset, clobbering verified fields of an already-relocated earlier command -- a TOCTOU on the device-visible command stream that lets one command rewrite another's GMR id, surface id, or other authenticated fields. Reject the command if the body is too small for the suffix to fit.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/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
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 2.6.33版本存在安全漏洞，该漏洞源于vmw_cmd_dma()函数未检查DMA命令头部大小是否足够，导致后缀指针下溢，可能覆盖已验证字段，造成TOCTOU，允许一个命令重写另一个命令的GMR id、surface id等认证字段。
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 4e4ddd47774313accc86b233d6ca2c6a9037a671 ~ eb20f418933bea53375843b27b4022c1810be63b -
Linux Linux 2.6.33 -

II. Public POCs for CVE-2026-74443

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III. Intelligence Information for CVE-2026-74443

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Patches & Fixes for CVE-2026-74443 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72208 9.8 CRITICAL ntfs: add bounds check before accessing EA entries
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74443

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