{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23242","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.989Z","datePublished":"2026-03-18T10:05:05.108Z","dateUpdated":"2026-09-08T08:45:06.774Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:20:52.020Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Fix potential NULL pointer dereference in header processing\n\nIf siw_get_hdr() returns -EINVAL before set_rx_fpdu_context(),\nqp->rx_fpdu can be NULL. The error path in siw_tcp_rx_data()\ndereferences qp->rx_fpdu->more_ddp_segs without checking, which\nmay lead to a NULL pointer deref. Only check more_ddp_segs when\nrx_fpdu is present.\n\nKASAN splat:\n[  101.384271] KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7]\n[  101.385869] RIP: 0010:siw_tcp_rx_data+0x13ad/0x1e50"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - SIW (Software iWARP) operates over TCP connections. A remote RDMA peer can send malformed DDP/RDMAP packets with invalid version or opcode fields to trigger the NULL pointer dereference in the TCP receive callback siw_tcp_rx_data().\nAC:L - The attacker can reliably trigger the bug by sending a malformed DDP packet with an invalid version or opcode field after establishing the TCP/RDMA connection. No race condition or special conditions required.\nPR:N - The vulnerability is triggered during iWARP protocol message processing from a connected TCP peer. While an RDMA connection must be established first, this is part of the network protocol and does not require authentication credentials — any peer that can connect to the SIW port can trigger this.\nUI:N - No user interaction is required. The attacker triggers the bug by sending malformed network packets to an SIW-enabled service.\nS:U - The vulnerability crashes the kernel, which is within the same security authority. There is no crossing of a security boundary like VM escape.\nC:N - This is a pure NULL pointer dereference (access at offset 0xc0 from NULL). No information disclosure occurs — the kernel oopses/panics without leaking data.\nI:N - This is a NULL pointer dereference causing a crash. There is no memory corruption, no write primitive, and no code execution — the access address (0xc0) is not mappable on modern kernels.\nA:H - The NULL pointer dereference causes a kernel oops or panic, crashing the system. This is reliably triggerable by a remote attacker sending malformed iWARP packets."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/siw/siw_qp_rx.c"],"versions":[{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","lessThan":"ab61841633d10e56a58c1493a262f0d02dba2f5e","status":"affected","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","lessThan":"8564dcc12fbb372d984ab45768cae9335777b274","status":"affected","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","lessThan":"ab957056192d6bd068b3759cb2077d859cca01f0","status":"affected","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","lessThan":"ffba40b67663567481fa8a1ed5d2da36897c175d","status":"affected","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","lessThan":"87b7a036d2c73d5bb3ae2d47dee23de465db3355","status":"affected","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","lessThan":"714c99e1dc8f85f446e05be02ba83972e981a817","status":"affected","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","lessThan":"ce025f7f5d070596194315eb2e4e89d568b8a755","status":"affected","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","lessThan":"14ab3da122bd18920ad57428f6cf4fade8385142","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/siw/siw_qp_rx.c"],"versions":[{"version":"5.3","status":"affected"},{"version":"0","lessThan":"5.3","status":"unaffected","versionType":"semver"},{"version":"5.10.252","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.202","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.165","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.128","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.75","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.14","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.4","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.10.252"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.15.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.18.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.19.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ab61841633d10e56a58c1493a262f0d02dba2f5e"},{"url":"https://git.kernel.org/stable/c/8564dcc12fbb372d984ab45768cae9335777b274"},{"url":"https://git.kernel.org/stable/c/ab957056192d6bd068b3759cb2077d859cca01f0"},{"url":"https://git.kernel.org/stable/c/ffba40b67663567481fa8a1ed5d2da36897c175d"},{"url":"https://git.kernel.org/stable/c/87b7a036d2c73d5bb3ae2d47dee23de465db3355"},{"url":"https://git.kernel.org/stable/c/714c99e1dc8f85f446e05be02ba83972e981a817"},{"url":"https://git.kernel.org/stable/c/ce025f7f5d070596194315eb2e4e89d568b8a755"},{"url":"https://git.kernel.org/stable/c/14ab3da122bd18920ad57428f6cf4fade8385142"}],"title":"RDMA/siw: Fix potential NULL pointer dereference in header processing","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"x_adpType":"supplier","providerMetadata":{"orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP","dateUpdated":"2026-09-08T08:45:06.774Z"},"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.5","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP 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