In the Linux kernel, the following vulnerability has been resolved: cipso: adjust cached option offsets when removing CIPSO cipso_v4_sk…
CVE-2026-99064 · GHSA-23p2-8f9v-3g5m · EUVD-2026-108730 · published 23 Oct 2026
How serious is it
- Severity: high, CVSS score 8.1 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-99064?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 89aa3619d141d6cfb6040a561aebb6d99d3e2285 <6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0
- Linux Linux: 89aa3619d141d6cfb6040a561aebb6d99d3e2285 <2200fe1d6148b78e1b8f00f4b2bd47760015077f
- Linux Linux: patch: 0
- Linux Linux: 89aa3619d141d6cfb6040a561aebb6d99d3e2285 <b965977126a90e01825814c859ba4788691eddd3
- Linux Linux: patch: 7.3
- Linux Linux: patch: 6.12.113
- Linux Linux: 6.10
- Linux Linux: patch: 7.2.11
- Linux Linux: patch: 6.18.57
- Linux Linux: 89aa3619d141d6cfb6040a561aebb6d99d3e2285 <6d25ffca055a77787c21a36b66c253f76239411b
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3
- git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f
- git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0
- git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b
- nvd.nist.gov/vuln/detail/CVE-2026-99064
Merged from ENISA EUVD. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON