CVE-2026-99064 is a vulnerability in Linux Kernel
Published on October 23, 2026
cipso: adjust cached option offsets when removing CIPSO
In the Linux kernel, the following vulnerability has been resolved:
cipso: adjust cached option offsets when removing CIPSO
cipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust
cached offsets for options that follow them.
For example, with a valid 10-byte CIPSO option followed by a seven-byte
RR option, parsing records rr at offset 30. Removing CIPSO moves RR to
offset 20, while the cached offset remains 30. Consumers such as
ip_forward_options() and __ip_options_echo() then access the wrong bytes;
the latter may interpret packet data as the option length and copy it into
fixed-size option storage.
Mirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and
router_alert offsets when they follow CIPSO. cipso_len is the distance
the first memmove() shifts those options. The later header move and
network-header reset relocate the bytes and their offset base together.
Products Associated with CVE-2026-99064
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Affected Versions
Linux:- Version 89aa3619d141d6cfb6040a561aebb6d99d3e2285 and below b965977126a90e01825814c859ba4788691eddd3 is affected.
- Version 89aa3619d141d6cfb6040a561aebb6d99d3e2285 and below 2200fe1d6148b78e1b8f00f4b2bd47760015077f is affected.
- Version 89aa3619d141d6cfb6040a561aebb6d99d3e2285 and below 6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0 is affected.
- Version 89aa3619d141d6cfb6040a561aebb6d99d3e2285 and below 6d25ffca055a77787c21a36b66c253f76239411b is affected.
- Version 6.10 is affected.
- Before 6.10 is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.