CVE-2026-98240

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98240", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.329Z", "datePublished": "2026-10-06T08:45:11.284Z", "dateUpdated": "2026-10-19T09:16:11.863Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:16:11.863Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip_tunnel: initialize `options_len` before referencing options\n\nThe following command triggers a kernel panic:\n\n ip link add d0 type dummy; ip link set d0 up\n ip route add 10.30.0.0/16 \\\n encap ip id 300 geneve_opts 4660:66:11223344 dev d0\n\n memcpy: detected buffer overflow: 4 byte write of buffer size 0\n kernel BUG at lib/string_helpers.c:1044!\n ...\n ip_tun_parse_opts.part.0.cold+0x10/0x10\n ip_tun_build_state+0x116/0x2a0\n\nOn kernels built with GCC 15+ and `CONFIG_FORTIFY_SOURCE`, the fortified\n`memcpy()` got 0 sized destination with request of 4 bytes length:\n\n static int ip_tun_parse_opts_geneve(...)\n {\n ...\n attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];\n data_len = nla_len(attr); /* == 4 */\n\n struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;\n memcpy(opt->opt_data, nla_data(attr), data_len);\n /* ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards */\n\nFixed by initializing the counter before the options are referenced.\nMatching what `tunnel_key_opts_set()` already does."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/ip_tunnel_core.c"], "versions": [{"version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18", "lessThan": "9907325257b4b382f26aafd5d9a8d47915907dd5", "status": "affected", "versionType": "git"}, {"version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18", "lessThan": "0f6a6beb01c068fcd5274eabf22c260039749fea", "status": "affected", "versionType": "git"}, {"version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18", "lessThan": "455ebeadf714f51e1dbbd6a022c74c9215b1cd76", "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/ip_tunnel_core.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.15", "versionEndExcluding": "6.18.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9907325257b4b382f26aafd5d9a8d47915907dd5"}, {"url": "https://git.kernel.org/stable/c/0f6a6beb01c068fcd5274eabf22c260039749fea"}, {"url": "https://git.kernel.org/stable/c/455ebeadf714f51e1dbbd6a022c74c9215b1cd76"}], "title": "net: ip_tunnel: initialize `options_len` before referencing options", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/ip_tunnel_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9907325257b4b382f26aafd5d9a8d47915907dd5", "status": "affected", "version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18", "versionType": "git"}, {"lessThan": "0f6a6beb01c068fcd5274eabf22c260039749fea", "status": "affected", "version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18", "versionType": "git"}, {"lessThan": "455ebeadf714f51e1dbbd6a022c74c9215b1cd76", "status": "affected", "version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/ip_tunnel_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.54", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip_tunnel: initialize `options_len` before referencing options\n\nThe following command triggers a kernel panic:\n\n ip link add d0 type dummy; ip link set d0 up\n ip route add 10.30.0.0/16 \\\n encap ip id 300 geneve_opts 4660:66:11223344 dev d0\n\n memcpy: detected buffer overflow: 4 byte write of buffer size 0\n kernel BUG at lib/string_helpers.c:1044!\n ...\n ip_tun_parse_opts.part.0.cold+0x10/0x10\n ip_tun_build_state+0x116/0x2a0\n\nOn kernels built with GCC 15+ and `CONFIG_FORTIFY_SOURCE`, the fortified\n`memcpy()` got 0 sized destination with request of 4 bytes length:\n\n static int ip_tun_parse_opts_geneve(...)\n {\n ...\n attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];\n data_len = nla_len(attr); /* == 4 */\n\n struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;\n memcpy(opt->opt_data, nla_data(attr), data_len);\n /* ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards */\n\nFixed by initializing the counter before the options are referenced.\nMatching what `tunnel_key_opts_set()` already does."}], "id": "CVE-2026-98240", "lastModified": "2026-10-19T10:18:24.877", "metrics": {}, "published": "2026-10-06T09:18:11.960", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0f6a6beb01c068fcd5274eabf22c260039749fea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/455ebeadf714f51e1dbbd6a022c74c9215b1cd76"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9907325257b4b382f26aafd5d9a8d47915907dd5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net: ip_tunnel: initialize `options_len` before referencing options", "id": "2546496", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546496"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-908", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: ip_tunnel: initialize `options_len` before referencing options\nThe following command triggers a kernel panic:\nip link add d0 type dummy; ip link set d0 up\nip route add 10.30.0.0/16 \\\nencap ip id 300 geneve_opts 4660:66:11223344 dev d0\nmemcpy: detected buffer overflow: 4 byte write of buffer size 0\nkernel BUG at lib/string_helpers.c:1044!\n...\nip_tun_parse_opts.part.0.cold+0x10/0x10\nip_tun_build_state+0x116/0x2a0\nOn kernels built with GCC 15+ and `CONFIG_FORTIFY_SOURCE`, the fortified\n`memcpy()` got 0 sized destination with request of 4 bytes length:\nstatic int ip_tun_parse_opts_geneve(...)\n{\n...\nattr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];\ndata_len = nla_len(attr); /* == 4 */\nstruct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;\nmemcpy(opt->opt_data, nla_data(attr), data_len);\n/* ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards */\nFixed by initializing the counter before the options are referenced.\nMatching what `tunnel_key_opts_set()` already does.", "A flaw was found in the Linux kernel's IP tunnel subsystem. When processing network routes with encapsulation options, the subsystem references tunnel options before their length is initialized. A local user with network configuration privileges can exploit this flaw by adding routes with specific tunnel options, triggering a kernel panic and causing a Denial of Service (DoS)."], "name": "CVE-2026-98240", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98240\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98240\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98240.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[bb5e62f2d547c4de6d1b144cbce2373a76c33f18,9907325257b4b382f26aafd5d9a8d47915907dd5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[bb5e62f2d547c4de6d1b144cbce2373a76c33f18,0f6a6beb01c068fcd5274eabf22c260039749fea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[bb5e62f2d547c4de6d1b144cbce2373a76c33f18,455ebeadf714f51e1dbbd6a022c74c9215b1cd76)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.54,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.8,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-06T13:00:15.830626+00:00", "updated": "2026-10-10T03:30:16.494329+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}