bpf: Disable preemption in bpf_get_stackid
CVE-2026-89799 · published 16 Sept 2026
How serious is it
- Severity: high, CVSS score 7.8 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-2026-89799?
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: d5a3b1f691865be576c2bffa708549b8cdccda19 to < e79a70c2e97ae36bbdd371f0ce88a525f7b49f01, d5a3b1f691865be576c2bffa708549b8cdccda19 to < 18c71e4b65ee60b8611fc071bdd7159f10185117, d5a3b1f691865be576c2bffa708549b8cdccda19 to < ccf481d73bce6e851cec364fe831c86fe66877cf, d5a3b1f691865be576c2bffa708549b8cdccda19 to < c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf
- Linux Linux: 4.6
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:
bpf: Disable preemption in bpf_get_stackid
The get_perf_callchain call needs disabled preemption plus we need
it disabled as long as we access its returned trace entries buffer.
Note the bpf_get_stackid_pe function is executed already with
preemption disabled.
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/e79a70c2e97ae36bbdd371f0ce88a525f7b49f01
- git.kernel.org/stable/c/18c71e4b65ee60b8611fc071bdd7159f10185117
- git.kernel.org/stable/c/ccf481d73bce6e851cec364fe831c86fe66877cf
- git.kernel.org/stable/c/c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf
- git.kernel.org/stable/c/15f1bd8574662f1b7b26aaa2e23ebf4066f0117d
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON