Double free in Linux kernel - CVE-2026-43128
Published: May 7, 2026
Vulnerability identifier: #VU130617
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43128
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to double free in RDMA umem dma-buf pinning logic when handling a failure in ib_umem_dmabuf_get_pinned_with_dma_device(). A local user can trigger a failure in dma-buf page mapping to cause a denial of service.
The issue occurs because the dma-buf may be unpinned on the failure path while the pinned flag remains set, leading to a second unpin during the release and revoke path.
How to mitigate CVE-2026-43128
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/104016eb671e19709721c1b0048dd912dc2e96be
- https://git.kernel.org/stable/c/40126bcbefa79ea86672e05dae608596bab38319
- https://git.kernel.org/stable/c/70542b69abff34d24b11ae0bb200cc7a766d18df
- https://git.kernel.org/stable/c/b324327ff6f48d8065dca67eb3b91357e72726bd
- https://git.kernel.org/stable/c/ba3bf0f1bf1d5d0404678485e872980532fcc2c4
- https://git.kernel.org/stable/c/d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf