nfsd: fix nfsd_file leak on inter-server COPY setup failure
CVE-2026-89680 · published 11 Sept 2026
How serious is it
- Severity: high, CVSS score 7.5 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-2026-89680?
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: ce0887ac96d35c7105090e166bb0807dc0a0e838 to < ab949252fdf102ae74329a0caa7995a849d0dafa, ce0887ac96d35c7105090e166bb0807dc0a0e838 to < 1a6a41b848455bf6ba2c9da2dfb0730e608ce7ab, ce0887ac96d35c7105090e166bb0807dc0a0e838 to < 424d5c95108a4809b832cb0a312c61de4aec0078, ce0887ac96d35c7105090e166bb0807dc0a0e838 to < 6ed8d6de7ec90c4ba84eb82673058f506e5777fd
- Linux Linux: 5.6
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:
nfsd: fix nfsd_file leak on inter-server COPY setup failure
When nfsd4_setup_inter_ssc() fails, nfsd4_copy() returns
nfserr_offload_denied directly, bypassing the out: label where
release_copy_files() would drop the nf_dst reference taken by
nfs4_preprocess_stateid_op(). Each failed inter-server COPY
leaks one nfsd_file, pinning file/inode/dentry/vfsmount.
Fix by setting status and jumping to out: instead of returning
directly.
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/ab949252fdf102ae74329a0caa7995a849d0dafa
- git.kernel.org/stable/c/1a6a41b848455bf6ba2c9da2dfb0730e608ce7ab
- git.kernel.org/stable/c/424d5c95108a4809b832cb0a312c61de4aec0078
- git.kernel.org/stable/c/6ed8d6de7ec90c4ba84eb82673058f506e5777fd
- git.kernel.org/stable/c/88a76145451d703eedd867b5989bf73d17340399
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON