High severity · published Mar 18, 2026
CVE-2026-23242
RDMA/siw: Fix potential NULL pointer dereference in header processing
7.5
CVSS
0.6%
EPSS
No
On KEV
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.3.1 before 5.10.252; 5.11 before 5.15.202; 5.16 before 6.1.165; 6.2 before 6.6.128; 6.7 before 6.12.75; 6.13 before 6.18.14; +2 more · source: NVD
LI
Linux · Linux
8b6a361b8c482f22ac99c3273285ff16b23fba91 before ab61841633d10e56a58c1493a262f0d02dba2f5e; 8b6a361b8c482f22ac99c3273285ff16b23fba91 before 8564dcc12fbb372d984ab45768cae9335777b274; 8b6a361b8c482f22ac99c3273285ff16b23fba91 before ab957056192d6bd068b3759cb2077d859cca01f0; 8b6a361b8c482f22ac99c3273285ff16b23fba91 before ffba40b67663567481fa8a1ed5d2da36897c175d; 8b6a361b8c482f22ac99c3273285ff16b23fba91 before 87b7a036d2c73d5bb3ae2d47dee23de465db3355; 8b6a361b8c482f22ac99c3273285ff16b23fba91 before 714c99e1dc8f85f446e05be02ba83972e981a817; +3 more · source: vendor
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23242
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23242
Patch
https://git.kernel.org/stable/c/14ab3da122bd18920ad57428f6cf4fade8385142
Patch
https://git.kernel.org/stable/c/714c99e1dc8f85f446e05be02ba83972e981a817
Patch
https://git.kernel.org/stable/c/8564dcc12fbb372d984ab45768cae9335777b274
Patch
https://git.kernel.org/stable/c/87b7a036d2c73d5bb3ae2d47dee23de465db3355
Patch
https://git.kernel.org/stable/c/ab61841633d10e56a58c1493a262f0d02dba2f5e
Patch
https://git.kernel.org/stable/c/ab957056192d6bd068b3759cb2077d859cca01f0
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