LoongArch: BPF: Refactor jump offset calculation in tail call
CVE-2026-89906 · 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-2026-89906?
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: 17c010fe45def335fe03a0718935416b04c7f349 to < 50fbc294e4e96246d60cd66f98acf043a362e3a0, f83d469e16bb1f75991ca67c56786fb2aaa42bea to < 89819868cde78cb2f748533785a46a3430873f20, cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 to < 882b8912b7e92341fdb115ba0e2e5142a28684ff, cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 to < 96f44d493c280ea161569c43d7ed0f3b0815803a
- Linux Linux: 6.17
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:
LoongArch: BPF: Refactor jump offset calculation in tail call
The old macro-based jmp_offset calculation derives the jump distance
from a stale prior-pass code stride, which can lead to wrong branch
offsets and soft lockups under extra JIT passes.
Fix this by calculating the offset directly on the absolute target:
"ctx->offset[insn + 1] - ctx->idx".
To avoid a false 16-bit range check abort during size estimation, add
a "ctx->image == NULL" guard to inject a safe dummy offset.
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/50fbc294e4e96246d60cd66f98acf043a362e3a0
- git.kernel.org/stable/c/89819868cde78cb2f748533785a46a3430873f20
- git.kernel.org/stable/c/882b8912b7e92341fdb115ba0e2e5142a28684ff
- git.kernel.org/stable/c/96f44d493c280ea161569c43d7ed0f3b0815803a
- git.kernel.org/stable/c/37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON