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CVE-2026-98493: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net: ipconfig: bound DHCP option construction ic_dhcp_init_options() appends the hostname (option 12), vendor-class (option 60) and client-ID (option 61) options into the fixed 312-byte bootp_pkt.exten[] buffer. Only the client-ID branch checked the remaining space; the hostname and vendor-class writes were unbounded. A 64-byte hostname together with the maximum 252-byte dhcpclass= identifier needs 18 + (2 + 64) + (2 + 252) = 338 of the 312 available bytes even before the terminating END marker, so the vendor-class memcpy runs past the end of exten[]. With CONFIG_FORTIFY_SOURCE this is reported as a field-spanning write and, when the kernel is booted with panic_on_warn=1, aborts boot with a panic. Route the optional options through a common helper that makes sure the option, its 2-byte header and the END marker all fit and drops an option that would not. Configurations with short options keep sending exactly the same bytes as before.

    Засегнати продукти

    • Linux Linux: 130c0f47fdf9c533deb1136cad5136f6cb7020f0 преди e0a221cec0e0ee437680ae0314a4b166509442c5; 130c0f47fdf9c533deb1136cad5136f6cb7020f0 преди ca811550b9fa87e02845b4a332d194c2304d933f; 130c0f47fdf9c533deb1136cad5136f6cb7020f0 преди d8016c82acdd7eaa462e1f38a962b15d8c6a650b; 130c0f47fdf9c533deb1136cad5136f6cb7020f0 преди 38a6a118260ebfc82d0c653194d616bdfbd236ac; 130c0f47fdf9c533deb1136cad5136f6cb7020f0 преди abcba6f080c63e403037ecdffde43170d242376a; 130c0f47fdf9c533deb1136cad5136f6cb7020f0 преди 24e79508b237dd2a69bc6fb6ac5cf7f126178307; 130c0f47fdf9c533deb1136cad5136f6cb7020f0 преди cbaad2922bd5d4d303055ae9afecc8999e6b40c9; 130c0f47fdf9c533deb1136cad5136f6cb7020f0 преди e47a1958e12abc3a17b5231a4f21c8f1bf662e08
    • Linux Linux: 2.6.36; преди 2.6.36; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.112 до 6.12.*; 6.18.55 до 6.18.*; 7.2.9 до 7.2.*; от 7.3 нататък

    История

    • 18 октомври 2026 Публикувано

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    Първоизточници

    CVE-2026-98493: Linux | freedomonline.bg