bpf: Check pointer type for all atomic RMW paths
CVE-2026-90177 · published 17 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-2026-90177?
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: d503a04f8bc0c75dc9db9452d8cc79d748afb752 to < b14dabe9656c1029abf3aa01e69c0d62f37f2f88, d503a04f8bc0c75dc9db9452d8cc79d748afb752 to < d4ba9d888ac0a8f12c78071fff73e1205a0b9293, d503a04f8bc0c75dc9db9452d8cc79d748afb752 to < eb287c6e81dedef92da01eb947f380d0aae513c3, d503a04f8bc0c75dc9db9452d8cc79d748afb752 to < 4bc49ae344d65cfcef738f281ac575cf73ca2fc5
- Linux Linux: 6.10
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: Check pointer type for all atomic RMW paths
Atomic RMW verification records an instruction pointer type only when the
current destination is PTR_TO_ARENA. A second path can therefore reach the
same instruction with an ordinary pointer without comparing it against the
saved arena type.
The post-verification fixup uses the saved type to rewrite the instruction
to BPF_PROBE_ATOMIC for every path. Record the actual destination type for
all atomic RMW paths so the existing mismatch check rejects incompatible
uses of one instruction.
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/b14dabe9656c1029abf3aa01e69c0d62f37f2f88
- git.kernel.org/stable/c/d4ba9d888ac0a8f12c78071fff73e1205a0b9293
- git.kernel.org/stable/c/eb287c6e81dedef92da01eb947f380d0aae513c3
- git.kernel.org/stable/c/4bc49ae344d65cfcef738f281ac575cf73ca2fc5
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON