CVE-2026-90435 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20507248
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-90435 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Fix integer overflow of user QP buffer size
set_user_buf_size() computes the QP buffer size by left-shifting the user-supplied rq.wqe_cnt and rq.wqe_shift values as signed integers. A sufficiently large rq.wqe_cnt causes signed integer overflow, which is undefined behavior, and yields a small or negative buf_size, causing ib_umem_get() to map a buffer smaller than the hardware will actually write into.
Replace the shifts and addition with check_shl_overflow() and check_add_overflow(), rejecting invalid user inputs.
Moreover, guard the identical shift computing qp->sq.offset in _create_user_qp() before set_user_buf_size() is reached.
References
- https://security-tracker.debian.org/tracker/CVE-2026-90435
- https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129
- https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77
- https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d
- https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20
- https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e
- https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331
- https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de
- https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c