CVE-2026-80888

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux65981f7681abdf92b25942222b629b9c512d0705 < 619c3cfa88e09603a13d918f754808db2dda7057affected
LinuxLinux65981f7681abdf92b25942222b629b9c512d0705 < c1c22fca0a0896a452a7cb92422d67babd65b4beaffected
LinuxLinux65981f7681abdf92b25942222b629b9c512d0705 < a1e972fa94c3a8069e022c67b9d97c7aa7b05293affected
LinuxLinux65981f7681abdf92b25942222b629b9c512d0705 < a8434b145b1e467940334c58c00af241e9494c5faffected
LinuxLinux65981f7681abdf92b25942222b629b9c512d0705 < 4df39eb99bb47d1f24d1952c23b21b10988356bfaffected
LinuxLinux65981f7681abdf92b25942222b629b9c512d0705 < f739416dc555fa205a785e5135d73fa39b26f35daffected
LinuxLinux3.13affected
LinuxLinux0 < 3.13unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References