{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23398", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.012Z", "datePublished": "2026-03-26T10:22:50.606Z", "dateUpdated": "2026-07-14T12:46:56.173Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:06:08.296Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nicmp: fix NULL pointer dereference in icmp_tag_validation()\n\nicmp_tag_validation() unconditionally dereferences the result of\nrcu_dereference(inet_protos[proto]) without checking for NULL.\nThe inet_protos[] array is sparse -- only about 15 of 256 protocol\nnumbers have registered handlers. When ip_no_pmtu_disc is set to 3\n(hardened PMTU mode) and the kernel receives an ICMP Fragmentation\nNeeded error with a quoted inner IP header containing an unregistered\nprotocol number, the NULL dereference causes a kernel panic in\nsoftirq context.\n\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:icmp_unreach (net/ipv4/icmp.c:1085 net/ipv4/icmp.c:1143)\n Call Trace:\n \n icmp_rcv (net/ipv4/icmp.c:1527)\n ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207)\n ip_local_deliver_finish (net/ipv4/ip_input.c:242)\n ip_local_deliver (net/ipv4/ip_input.c:262)\n ip_rcv (net/ipv4/ip_input.c:573)\n __netif_receive_skb_one_core (net/core/dev.c:6164)\n process_backlog (net/core/dev.c:6628)\n handle_softirqs (kernel/softirq.c:561)\n \n\nAdd a NULL check before accessing icmp_strict_tag_validation. If the\nprotocol has no registered handler, return false since it cannot\nperform strict tag validation." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/icmp.c" ], "versions": [ { "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e", "lessThan": "571d9d7b650f02d1e38c01128817868bceac9edd", "status": "affected", "versionType": "git" }, { "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e", "lessThan": "d783fa413c702ff0f8f8bea63f862e28eeaf39e3", "status": "affected", "versionType": "git" }, { "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e", "lessThan": "1f9f2c6d4b2a613b7756fc5679c5116ba2ca0161", "status": "affected", "versionType": "git" }, { "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e", "lessThan": "b61529c357f1ee4d64836eb142a542d2e7ad67ce", "status": "affected", "versionType": "git" }, { "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e", "lessThan": "9647e99d2a617c355d2b378be0ff6d0e848fd579", "status": "affected", "versionType": "git" }, { "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e", "lessThan": "d938dd5a0ad780c891ea3bc94cae7405f11e618a", "status": "affected", "versionType": "git" }, { "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e", "lessThan": "1e4e2f5e48cec0cccaea9815fb9486c084ba41e2", "status": "affected", "versionType": "git" }, { "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e", "lessThan": "614aefe56af8e13331e50220c936fc0689cf5675", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/icmp.c" ], "versions": [ { "version": "3.14", "status": "affected" }, { "version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.10", "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": "3.14", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.19.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/571d9d7b650f02d1e38c01128817868bceac9edd" }, { "url": "https://git.kernel.org/stable/c/d783fa413c702ff0f8f8bea63f862e28eeaf39e3" }, { "url": "https://git.kernel.org/stable/c/1f9f2c6d4b2a613b7756fc5679c5116ba2ca0161" }, { "url": "https://git.kernel.org/stable/c/b61529c357f1ee4d64836eb142a542d2e7ad67ce" }, { "url": "https://git.kernel.org/stable/c/9647e99d2a617c355d2b378be0ff6d0e848fd579" }, { "url": "https://git.kernel.org/stable/c/d938dd5a0ad780c891ea3bc94cae7405f11e618a" }, { "url": "https://git.kernel.org/stable/c/1e4e2f5e48cec0cccaea9815fb9486c084ba41e2" }, { "url": "https://git.kernel.org/stable/c/614aefe56af8e13331e50220c936fc0689cf5675" } ], "title": "icmp: fix NULL pointer dereference in icmp_tag_validation()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:46:56.173Z" }, "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 MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": 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