accel/amdxdna: return early from a zero-length flush

Summary

In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: return early from a zero-length flush SYNC_BO does not constrain its size, so a request for zero bytes reaches drm_clflush_virt_range(), which ends with an unconditional clflushopt(end - 1). For an empty range that is the byte before the mapping, and abo->mem.kva comes from vmap(), so the access lands in the guard page below the vmalloc area and faults: BUG: unable to handle page fault for address: ffffd16fbbc70fff #PF: supervisor read access in kernel mode Oops: Oops: 0000 [#1] SMP NOPTI CPU: 7 UID: 1000 Comm: sync_bo_probe RIP: 0010:drm_clflush_virt_range+0x3c/0x70 Call Trace: amdxdna_drm_sync_bo_ioctl+0x124/0x430 [amdxdna] drm_ioctl+0x301/0x4c0 __x64_sys_ioctl+0x115/0x2f0 do_syscall_64+0xa6/0x3d0 Any process that can open the render node can do this. Reproduced 3 of 3 times on a Strix Point NPU (1022:17f0), by calling SYNC_BO with size 0 on an AMDXDNA_BO_SHARE object. The import arm takes the same request but flushes the whole scatterlist, so it survives it. Nothing needs flushing for an empty range, so answer before choosing a path.

Timeline

1. Sep 16, 2026, 10:32 AM UTCCVE published
2. Oct 19, 2026, 8:55 AM UTCRecord last updated

Affected versions

• Linux Linux

  From e252e3f3488a49267e08ea7d972ac5ba3f2f1763 · fixed in 45962da5821d0a691f638ccb13842889156d8969; From e252e3f3488a49267e08ea7d972ac5ba3f2f1763 · fixed in f00def884a831dc49eb659dac2dd09dbfd21e67f; From e252e3f3488a49267e08ea7d972ac5ba3f2f1763 · fixed in dc14753664240cedf669623b27ae9922b0618b25

• Linux Linux

  6.17

• KernelLinux

  From 6.17.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.5

References 3