CVE-2026-23243 — Incorrect Calculation of Buffer Size in Linux
Severity
7.8HIGHNVD
EPSS
0.0%
top 97.70%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedMar 18
Description
In the Linux kernel, the following vulnerability has been resolved:
RDMA/umad: Reject negative data_len in ib_umad_write
ib_umad_write computes data_len from user-controlled count and the
MAD header sizes. With a mismatched user MAD header size and RMPP
header length, data_len can become negative and reach ib_create_send_mad().
This can make the padding calculation exceed the segment size and trigger
an out-of-bounds memset in alloc_send_rmpp_list().
Add an explicit check to reject negative d…
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9
Affected Packages3 packages
▶CVEListV5linux/linux2be8e3ee8efd6f99ce454115c29d09750915021a — 1371ef6b1ecf3676b8942f5dfb3634fb0648128e+8
🔴Vulnerability Details
4GHSA▶
GHSA-85rq-57vx-88q2: In the Linux kernel, the following vulnerability has been resolved:
RDMA/umad: Reject negative data_len in ib_umad_write
ib_umad_write computes data↗2026-03-18
OSV▶
CVE-2026-23243: In the Linux kernel, the following vulnerability has been resolved: RDMA/umad: Reject negative data_len in ib_umad_write ib_umad_write computes data_l↗2026-03-18