In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_connmark: reject invalid shift parameters Revision 2 …
CVE-2026-72347 · published 15 Aug 2026
How serious is it
- Severity: high, CVSS score 7.3 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-2026-72347?
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: 4.17
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:
netfilter: xt_connmark: reject invalid shift parameters
Revision 2 of the CONNMARK target accepts user-controlled shift
parameters and applies them to 32-bit mark values in
connmark_tg_shift().
A shift_bits value of 32 or more triggers an undefined-shift bug when
the rule is evaluated. Invalid shift_dir values are also accepted and
silently fall back to the left-shift path.
Reject invalid revision-2 shift parameters in connmark_tg_check() so
malformed rules fail at installation time, before they can reach the
packet path.
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/1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc
- git.kernel.org/stable/c/230173cc6105bdfb2696d37e6e56687b003fbe63
- git.kernel.org/stable/c/4eef84b09a3836919360c4232b0f16651a155eec
- git.kernel.org/stable/c/8ace320ac4416f5e5fbcd065309fb2dfcce787b0
- git.kernel.org/stable/c/9657bb11a6376ab0a79f05d433713d6944111e9d
- git.kernel.org/stable/c/c3fa852d117b3fda72265e4230e3967db4a74fcf
- git.kernel.org/stable/c/d8ce63d928b457fba7ed1e302492dfd32293671c
Merged from NVD. Last updated 23 Oct 2026. All vulnerabilities · RSS · JSON