CVE-2026-46229
Published: June 2, 2026Last modified: June 2, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Clear VRAM on allocation to prevent stale data exposure KFD VRAM allocations set AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE but not AMDGPU_GEM_CREATE_VRAM_CLEARED, leaving freshly allocated VRAM with stale data from prior use observable by compute kernels. The GEM ioctl path already sets VRAM_CLEARED for all userspace allocations via amdgpu_gem_create_ioctl() and amdgpu_mode_dumb_create(). The KFD path was missing this flag, allowing stale page table remnants to leak into user buffers. This causes crashes in RCCL P2P transport where non-zero data in ptrExchange/head/tail fields corrupts the protocol handshake.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Vulnerable (6.1.174-r0) |
| 25 LTS | linux-lts | Fixed (6.12.92-r0) | |
| Stream | linux-lts | Fixed (6.12.92-r0) |
References
- https://git.kernel.org/stable/c/047d44d8d29a6a1a5757256837aa9dd78e3cd0b5
- https://git.kernel.org/stable/c/1db431380879fd9d28b763a88a0c0431be5be8df
- https://git.kernel.org/stable/c/32b153658f017ad2f5bf8aab479e8d16ac95bc3a
- https://git.kernel.org/stable/c/77d0b5d11387071770246fd0185a69fa28e8e109
- https://git.kernel.org/stable/c/ad52d61d82181dbdb7f05826de38352d5e550cc2