vdpa/mlx5: Fix buffer length in create_direct_keys()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74712
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:45 UTC
Updated2026-08-22 16:16:45 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0071b138d44af4296bf871e6624369ce697b4b15 ec3bb289cf19d526224117d5d450a5fd9cbd5ab2 git Not specified
CNA Linux Linux affected 0071b138d44af4296bf871e6624369ce697b4b15 cde8931a25392670dd59a0acfcab87a830ab66c5 git Not specified
CNA Linux Linux affected 0071b138d44af4296bf871e6624369ce697b4b15 6c8a9f7bc00301e533a5366384f3070a8e7f8430 git Not specified
CNA Linux Linux affected 0071b138d44af4296bf871e6624369ce697b4b15 727e1f569855df83579edbd73dcb4a0723543a12 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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