CVE-2026-74712vdpa/mlx5: Fix buffer length in create_direct_keys()
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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.
- CVSS
- 9.3 CRITICAL (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0071b138d44af4296bf871e6624369ce697b4b15 before ec3bb289cf19d526224117d5d450a5fd9cbd5ab2; from 0071b138d44af4296bf871e6624369ce697b4b15 before cde8931a25392670dd59a0acfcab87a830ab66c5; 0071b138d44af4296bf871e6624369ce697b4b15 builds before 6c8a9f7bc00301e533a5366384f3070a8e7f8430; from 0071b138d44af4296bf871e6624369ce697b4b15 before 727e1f569855df83579edbd73dcb4a0723543a12 | CNA record |
References
- https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2
- https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5
- https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430
- https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.