Linux Kernel: Vdpa/MLX5 Buffer Overflow in create_direct_keys()
CVE-2026-74712 Published on August 22, 2026
vdpa/mlx5: Fix buffer length in create_direct_keys()
In the Linux kernel, the following vulnerability has been resolved:
vdpa/mlx5: Fix buffer length in create_direct_keys()
We have seen in our CI the following KASAN message:
BUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core]
Read of size 272 at addr 0000000176795020 by task qemu-system-s39/82764
[...]
[<000011388ab3a7a0>] cmd_exec+0x550/0xca0 [mlx5_core]
[<000011388ab3b61c>] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core]
[<000011388b21e82e>] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa]
[<000011388b21fd44>] create_direct_keys+0x954/0xef0 [mlx5_vdpa]
[...]
The buggy address is located 4128 bytes inside of
allocated 4384-byte region [0000000176794000, 0000000176795120)
So in essence we read 16 bytes beyond 4384-byte allocation.
create_direct_keys calculates the pointer and length for in and out
buffers.
The size calculation for in includes the entire structure
size (out + in + mtt[]) but the pointer passed to cmd_exec points only
to the 'in' field, skipping the 'out' field.
This causes mlx5_copy_to_msg() to read beyond the allocated buffer
by sizeof(out) bytes when copying command data.
Properly calculate the input size to match the pointer and allocation size.
Products Associated with CVE-2026-74712
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Affected Versions
Linux:- Version 0071b138d44af4296bf871e6624369ce697b4b15 and below ec3bb289cf19d526224117d5d450a5fd9cbd5ab2 is affected.
- Version 0071b138d44af4296bf871e6624369ce697b4b15 and below cde8931a25392670dd59a0acfcab87a830ab66c5 is affected.
- Version 0071b138d44af4296bf871e6624369ce697b4b15 and below 6c8a9f7bc00301e533a5366384f3070a8e7f8430 is affected.
- Version 0071b138d44af4296bf871e6624369ce697b4b15 and below 727e1f569855df83579edbd73dcb4a0723543a12 is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.12.104, <= 6.12.* is unaffected.
- Version 6.18.45, <= 6.18.* is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.