Bug 2448602 (CVE-2026-23242)

Summary: CVE-2026-23242 kernel: RDMA/siw: Fix potential NULL pointer dereference in header processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A NULL pointer dereference vulnerability was found in the Linux kernel's Software iWARP (siw) RDMA driver. In siw_tcp_rx_data(), when siw_get_hdr() returns -EINVAL before set_rx_fpdu_context() is called, the qp->rx_fpdu pointer remains NULL. The error handling path then dereferences qp->rx_fpdu->more_ddp_segs without a NULL check, causing a kernel crash.
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Description OSIDB Bzimport 2026-03-18 11:02:38 UTC 
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
Comment 1 Keith Grant 2026-03-18 12:26:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026031816-CVE-2026-23242-a8b5@gregkh/T