CVE-2026-23242 RDMA/siw: Fix potential NULL pointer dereference in header processing

What is CVE-2026-23242?

CVE-2026-23242 is a high-severity vulnerability in Linux kernel, published on 18 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/siw: Fix potential NULL pointer dereference in header processing

If siw_get_hdr() returns -EINVAL before set_rx_fpdu_context(), qp->rx_fpdu can be NULL. The error path in siw_tcp_rx_data() dereferences qp->rx_fpdu->more_ddp_segs without checking, which may lead to a NULL pointer deref. Only check more_ddp_segs when rx_fpdu is present.

KASAN splat: [ 101.384271] KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] [ 101.385869] RIP: 0010:siw_tcp_rx_data+0x13ad/0x1e50

Weakness: CWE-476

Which versions are affected by CVE-2026-23242?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-23242?

Apply the vendor's patch.

Is CVE-2026-23242 being exploited?

There is no known exploitation of CVE-2026-23242 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-79980, BELL-CVE-2026-23242, DEBIAN-CVE-2026-23242, GHSA-6xq4-2j3g-9m44, ROOT-OS-DEBIAN-11-CVE-2026-23242, ROOT-OS-DEBIAN-12-CVE-2026-23242 and 4 more.