{ "cveId": "CVE-2026-98240", "url": "https://patchblox.com/security/cve/CVE-2026-98240", "summary": "CVE-2026-98240 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-98240, released October 6, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "net: ip_tunnel: initialize \u0060options_len\u0060 before referencing options", "description": "In the Linux kernel, the following vulnerability has been resolved: net: ip_tunnel: initialize \u0060options_len\u0060 before referencing options The following command triggers a kernel panic: ip link add d0 type dummy; ip link set d0 up ip route add 10.30.0.0/16 \\ encap ip id 300 geneve_opts 4660:66:11223344 dev d0 memcpy: detected buffer overflow: 4 byte write of buffer size 0 kernel BUG at lib/string_helpers.c:1044! ... ip_tun_parse_opts.part.0.cold\u002B0x10/0x10 ip_tun_build_state\u002B0x116/0x2a0 On kernels built with GCC 15\u002B and \u0060CONFIG_FORTIFY_SOURCE\u0060, the fortified \u0060memcpy()\u0060 got 0 sized destination with request of 4 bytes length: static int ip_tun_parse_opts_geneve(...) { ... attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; data_len = nla_len(attr); /* == 4 */ struct geneve_opt *opt = ip_tunnel_info_opts(info) \u002B opts_len; memcpy(opt-\u003Eopt_data, nla_data(attr), data_len); /* ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards */ Fixed by initializing the counter before the options are referenced. Matching what \u0060tunnel_key_opts_set()\u0060 already does.", "published": "2026-10-06T09:18:11Z", "severity": "important", "epss": 0.00183, "epssPercentile": 0.07968, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98240", "fixes": [ { "platform": "linux", "product": "bpftool6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "bpftool6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel-livepatch-6.18.54-121.166", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-headers", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra-common", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "kernel6.18-tools-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "7.2.8-1", "fix": "DEBIAN-CVE-2026-98240", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98240", "released": "2026-10-06T21:56:27Z" }, { "platform": "linux", "product": "microvm-kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "python3-perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" }, { "platform": "linux", "product": "python3-perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.54-121.166.amzn2023", "fix": "ALAS2023-2026-3192", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3192", "released": "2026-11-07T01:06:07Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T13:06:02Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }