{"id":"CVE-2026-23242","state":"PUBLISHED","title":"RDMA/siw: Fix potential NULL pointer dereference in header processing","description":"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","publishedAt":"2026-03-18T10:05:05.108Z","updatedAt":"2026-10-19T18:35:39.941Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"ab61841633d10e56a58c1493a262f0d02dba2f5e","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"8564dcc12fbb372d984ab45768cae9335777b274","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"ab957056192d6bd068b3759cb2077d859cca01f0","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"ffba40b67663567481fa8a1ed5d2da36897c175d","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"87b7a036d2c73d5bb3ae2d47dee23de465db3355","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"714c99e1dc8f85f446e05be02ba83972e981a817","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"ce025f7f5d070596194315eb2e4e89d568b8a755","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"14ab3da122bd18920ad57428f6cf4fade8385142","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/siw/siw_qp_rx.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.3","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/siw/siw_qp_rx.c"]}],"references":["https://git.kernel.org/stable/c/ab61841633d10e56a58c1493a262f0d02dba2f5e","https://git.kernel.org/stable/c/8564dcc12fbb372d984ab45768cae9335777b274","https://git.kernel.org/stable/c/ab957056192d6bd068b3759cb2077d859cca01f0","https://git.kernel.org/stable/c/ffba40b67663567481fa8a1ed5d2da36897c175d","https://git.kernel.org/stable/c/87b7a036d2c73d5bb3ae2d47dee23de465db3355","https://git.kernel.org/stable/c/714c99e1dc8f85f446e05be02ba83972e981a817","https://git.kernel.org/stable/c/ce025f7f5d070596194315eb2e4e89d568b8a755","https://git.kernel.org/stable/c/14ab3da122bd18920ad57428f6cf4fade8385142","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23242.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23242","state":"PUBLISHED","datePublished":"2026-03-18T10:05:05.108Z","dateUpdated":"2026-10-19T18:35:39.941Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.989Z"},"containers":{"cna":{"title":"RDMA/siw: Fix potential NULL pointer dereference in header processing","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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"ab61841633d10e56a58c1493a262f0d02dba2f5e","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"8564dcc12fbb372d984ab45768cae9335777b274","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"ab957056192d6bd068b3759cb2077d859cca01f0","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"ffba40b67663567481fa8a1ed5d2da36897c175d","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"87b7a036d2c73d5bb3ae2d47dee23de465db3355","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"714c99e1dc8f85f446e05be02ba83972e981a817","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"ce025f7f5d070596194315eb2e4e89d568b8a755","versionType":"git"},{"version":"8b6a361b8c482f22ac99c3273285ff16b23fba91","status":"affected","lessThan":"14ab3da122bd18920ad57428f6cf4fade8385142","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/siw/siw_qp_rx.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.3","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/siw/siw_qp_rx.c"]}],"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"}],"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. 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