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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-98493

net: ipconfig: bound DHCP option construction

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 to < e0a221cec0e0ee437680ae0314a4b166509442c5affected
  • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 to < ca811550b9fa87e02845b4a332d194c2304d933faffected
  • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 to < d8016c82acdd7eaa462e1f38a962b15d8c6a650baffected
  • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 to < 38a6a118260ebfc82d0c653194d616bdfbd236acaffected
  • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 to < abcba6f080c63e403037ecdffde43170d242376aaffected
  • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 to < 24e79508b237dd2a69bc6fb6ac5cf7f126178307affected
  • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 to < cbaad2922bd5d4d303055ae9afecc8999e6b40c9affected
  • 130c0f47fdf9c533deb1136cad5136f6cb7020f0 to < e47a1958e12abc3a17b5231a4f21c8f1bf662e08affected

Linux Linux

Default version status: affected

  • 2.6.36affected
  • 0 to < 2.6.36unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.224 to ≤ 5.15.*unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.112 to ≤ 6.12.*unaffected
  • 6.18.55 to ≤ 6.18.*unaffected
  • 7.2.9 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References