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CVE-2026-89680: nfsd: fix nfsd_file leak on inter-server COPY setup failure

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

Description

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.

Affected products

• Linux: 5.6 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1a6a41b848455bf6ba2c9da2dfb0730e608ce7ab
• https://git.kernel.org/stable/c/424d5c95108a4809b832cb0a312c61de4aec0078
• https://git.kernel.org/stable/c/6ed8d6de7ec90c4ba84eb82673058f506e5777fd
• https://git.kernel.org/stable/c/88a76145451d703eedd867b5989bf73d17340399
• https://git.kernel.org/stable/c/94c28af6fd89cb204975e49b824f8ee521bb84e9
• https://git.kernel.org/stable/c/ab949252fdf102ae74329a0caa7995a849d0dafa
• https://git.kernel.org/stable/c/d15f76fddc5d0215db5f18851048376a1ea79bd6
• https://git.kernel.org/stable/c/eb22420e5bd6eb3afa1f840036bb08a7ac90db76

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