{"id":"CVE-2026-98493","aliases":[],"cve":{"records":[{"id":"CVE-2026-98493","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.353Z","published":"2026-10-18T15:16:22.301Z","modified":"2026-10-30T12:38:18.516Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:38:18.516Z"}],"references":[{"url":"https://git.kernel.org/stable/c/e0a221cec0e0ee437680ae0314a4b166509442c5","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/ca811550b9fa87e02845b4a332d194c2304d933f","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/d8016c82acdd7eaa462e1f38a962b15d8c6a650b","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/38a6a118260ebfc82d0c653194d616bdfbd236ac","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/abcba6f080c63e403037ecdffde43170d242376a","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/24e79508b237dd2a69bc6fb6ac5cf7f126178307","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/cbaad2922bd5d4d303055ae9afecc8999e6b40c9","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/e47a1958e12abc3a17b5231a4f21c8f1bf662e08","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"net: ipconfig: bound DHCP option construction","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipconfig: bound DHCP option construction\n\nic_dhcp_init_options() appends the hostname (option 12), vendor-class\n(option 60) and client-ID (option 61) options into the fixed 312-byte\nbootp_pkt.exten[] buffer.  Only the client-ID branch checked the\nremaining space; the hostname and vendor-class writes were unbounded.\n\nA 64-byte hostname together with the maximum 252-byte dhcpclass=\nidentifier needs 18 + (2 + 64) + (2 + 252) = 338 of the 312 available\nbytes even before the terminating END marker, so the vendor-class memcpy\nruns past the end of exten[].  With CONFIG_FORTIFY_SOURCE this is\nreported as a field-spanning write and, when the kernel is booted with\npanic_on_warn=1, aborts boot with a panic.\n\nRoute the optional options through a common helper that makes sure the\noption, its 2-byte header and the END marker all fit and drops an option\nthat would not.  Configurations with short options keep sending exactly\nthe same bytes as before.","score":null,"severity":"unknown","published":"2026-10-18T15:16:22.301Z","modified":"2026-10-30T12:38:18.516Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"130c0f47fdf9c533deb1136cad5136f6cb7020f0","status":"affected","lessThan":"e0a221cec0e0ee437680ae0314a4b166509442c5","versionType":"git"},{"version":"130c0f47fdf9c533deb1136cad5136f6cb7020f0","status":"affected","lessThan":"ca811550b9fa87e02845b4a332d194c2304d933f","versionType":"git"},{"version":"130c0f47fdf9c533deb1136cad5136f6cb7020f0","status":"affected","lessThan":"d8016c82acdd7eaa462e1f38a962b15d8c6a650b","versionType":"git"},{"version":"130c0f47fdf9c533deb1136cad5136f6cb7020f0","status":"affected","lessThan":"38a6a118260ebfc82d0c653194d616bdfbd236ac","versionType":"git"},{"version":"130c0f47fdf9c533deb1136cad5136f6cb7020f0","status":"affected","lessThan":"abcba6f080c63e403037ecdffde43170d242376a","versionType":"git"},{"version":"130c0f47fdf9c533deb1136cad5136f6cb7020f0","status":"affected","lessThan":"24e79508b237dd2a69bc6fb6ac5cf7f126178307","versionType":"git"},{"version":"130c0f47fdf9c533deb1136cad5136f6cb7020f0","status":"affected","lessThan":"cbaad2922bd5d4d303055ae9afecc8999e6b40c9","versionType":"git"},{"version":"130c0f47fdf9c533deb1136cad5136f6cb7020f0","status":"affected","lessThan":"e47a1958e12abc3a17b5231a4f21c8f1bf662e08","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98493"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"2.6.36","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.36","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98493"}],"remediation":[],"references":["https://git.kernel.org/stable/c/e0a221cec0e0ee437680ae0314a4b166509442c5","https://git.kernel.org/stable/c/ca811550b9fa87e02845b4a332d194c2304d933f","https://git.kernel.org/stable/c/d8016c82acdd7eaa462e1f38a962b15d8c6a650b","https://git.kernel.org/stable/c/38a6a118260ebfc82d0c653194d616bdfbd236ac","https://git.kernel.org/stable/c/abcba6f080c63e403037ecdffde43170d242376a","https://git.kernel.org/stable/c/24e79508b237dd2a69bc6fb6ac5cf7f126178307","https://git.kernel.org/stable/c/cbaad2922bd5d4d303055ae9afecc8999e6b40c9","https://git.kernel.org/stable/c/e47a1958e12abc3a17b5231a4f21c8f1bf662e08"],"sources":[{"name":"CVE","id":"CVE-2026-98493","modified":"2026-10-30T12:38:18.516Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-98493"}],"assessments":[],"sourceAffected":[],"observedAt":"2026-10-30T14:01:37.848Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T03:00:33.317Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}