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CVE-2026-72219: lockd: Plug nlm_file leak when nlm_do_fopen() fails

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-17

Description

In the Linux kernel, the following vulnerability has been resolved: lockd: Plug nlm_file leak when nlm_do_fopen() fails A client can repeatedly drive nlm_do_fopen() failures by presenting file handles that the underlying export rejects. After kzalloc_obj() succeeds in nlm_lookup_file(), the freshly allocated nlm_file is not yet inserted into nlm_files[]. The nlm_do_fopen() failure path jumps to out_unlock, which releases nlm_file_mutex and returns without freeing the allocation, so each failure leaks one nlm_file. Route the failure through out_free so kfree() runs before the function returns.

Affected products

• Linux kernel: from 5.10.220 before 5.10.261; 5.15 — fixed in 5.10.261, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.261, 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1161c4b5bd0048c8148e919f818a33cff3623ef0
• https://git.kernel.org/stable/c/1403f1221a35a6caf959bb7bf005741f17263c66
• https://git.kernel.org/stable/c/39f59bf67231ed2eb0cdf6337194360e964b609a
• https://git.kernel.org/stable/c/3f2dc01b9cb516d4727a3b9263ee58c71ca00ba9
• https://git.kernel.org/stable/c/bca74fff138429f3d5802865f38fc883d53a4f1a
• https://git.kernel.org/stable/c/d7c677feb3aa1f42b1026d75a8ea61338b51e4fb
• https://git.kernel.org/stable/c/ddfbd816273b4e9c9b836f5b8773664c6f40f807
• https://git.kernel.org/stable/c/f16a1513452edb532fec81e591c64c320866719c

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