CVE-2026-43381 PUBLISHED

nouveau/dpcd: return EBUSY for aux xfer if the device is asleep

Assigner: Linux
Reserved: 01.05.2026 Published: 08.05.2026 Updated: 08.05.2026

In the Linux kernel, the following vulnerability has been resolved:

nouveau/dpcd: return EBUSY for aux xfer if the device is asleep

If we have runtime suspended, and userspace wants to use /dev/drm_dp_* then just tell it the device is busy instead of crashing in the GSP code.

WARNING: CPU: 2 PID: 565741 at drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/rpc.c:164 r535_gsp_msgq_wait+0x9a/0xb0 [nouveau] CPU: 2 UID: 0 PID: 565741 Comm: fwupd Not tainted 6.18.10-200.fc43.x86_64 #1 PREEMPT(lazy) Hardware name: LENOVO 20QTS0PQ00/20QTS0PQ00, BIOS N2OET65W (1.52 ) 08/05/2024 RIP: 0010:r535_gsp_msgq_wait+0x9a/0xb0 [nouveau]

This is a simple fix to get backported. We should probably engineer a proper power domain solution to wake up devices and keep them awake while fw updates are happening.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 8894f4919bc43f821775db2cfff4b917871b2102 to 178df7c91e6c202579284df9f79d1592a514cdcf (excl.)
  • affected from 8894f4919bc43f821775db2cfff4b917871b2102 to 4df518aa196085909fd7e32518ecd27fba60ed69 (excl.)
  • affected from 8894f4919bc43f821775db2cfff4b917871b2102 to cd24cab2023aa46b595bc6b9cc39d8973d9d0a8c (excl.)
  • affected from 8894f4919bc43f821775db2cfff4b917871b2102 to fad178ae894930520519ead3c8e0150641466360 (excl.)
  • affected from 8894f4919bc43f821775db2cfff4b917871b2102 to 6bdd2d70c338d52c387d3b3aadc596784ae81b01 (excl.)
  • affected from 8894f4919bc43f821775db2cfff4b917871b2102 to ad8fa5bff53f5d1f8394f996850da8ce070eaee3 (excl.)
  • affected from 8894f4919bc43f821775db2cfff4b917871b2102 to 24639553a016578222ac597db924dfb6fa5ec8b5 (excl.)
  • affected from 8894f4919bc43f821775db2cfff4b917871b2102 to 8f3c6f08ababad2e3bdd239728cf66a9949446b4 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 3.16 is affected
  • unaffected from 0 to 3.16 (excl.)
  • unaffected from 5.10.253 to 5.10.* (incl.)
  • unaffected from 5.15.203 to 5.15.* (incl.)
  • unaffected from 6.1.167 to 6.1.* (incl.)
  • unaffected from 6.6.130 to 6.6.* (incl.)
  • unaffected from 6.12.78 to 6.12.* (incl.)
  • unaffected from 6.18.19 to 6.18.* (incl.)
  • unaffected from 6.19.9 to 6.19.* (incl.)
  • unaffected from 7.0 to * (incl.)

References