lockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure
Summary
| CVE | CVE-2026-72218 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-15 06:21:40 UTC |
| Updated | 2026-08-17 06:18:22 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: lockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure The cached-file path in nlm_lookup_file() reaches the found: label unconditionally, even when nlm_do_fopen() fails. At that label *result and file->f_count are updated before the error is returned. The wrappers nlm3svc_lookup_file() and nlm4svc_lookup_file() then bail out of their switch without copying *result back to their caller, so the proc handler's local nlm_file pointer remains NULL and the cleanup path skips nlm_release_file(). The f_count increment is never released, and nlm_traverse_files() can no longer reap the file because its refcount never returns to zero between requests. Short-circuit the cached path so neither *result nor f_count is touched when nlm_do_fopen() fails on a hashed nlm_file. |
Risk And Classification
EPSS: 0.002100000 probability, percentile 0.115310000 (date 2026-08-17)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected e580323ac0b51ad10ec2e181d1f777479b7983e7 6cd84cefd8b73e85b9eda17b319bd40a670f3a38 git | Not specified |
| CNA | Linux | Linux | affected 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 fe3b45b56b6c3d4b6b341de27fa291005287a21c git | Not specified |
| CNA | Linux | Linux | affected 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 cb3420c047957e565101585bb4f15e1a6e3de6b0 git | Not specified |
| CNA | Linux | Linux | affected 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 7ce4c23e783e766507b2cef27bbf97e9ca944f1a git | Not specified |
| CNA | Linux | Linux | affected 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 84008bf1860e0ef8059a7583a1163f36b704d08a git | Not specified |
| CNA | Linux | Linux | affected 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 46d59ff421824b6483549d87f14efffbbbd1f6cb git | Not specified |
| CNA | Linux | Linux | affected 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 3a5c55a19cad62f2973be25fe96a1a9e7f618e8a git | Not specified |
| CNA | Linux | Linux | affected 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 70a38f87bed7f0694fd07988b47b2db1e10d8df3 git | Not specified |
| CNA | Linux | Linux | affected 5.10.220 5.10.261 semver | Not specified |
| CNA | Linux | Linux | affected 5.15 | Not specified |
| CNA | Linux | Linux | unaffected 5.15 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.261 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.212 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.97 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.40 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.5 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/46d59ff421824b6483549d87f14efffbbbd1f6cb | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/84008bf1860e0ef8059a7583a1163f36b704d08a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/fe3b45b56b6c3d4b6b341de27fa291005287a21c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cb3420c047957e565101585bb4f15e1a6e3de6b0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3a5c55a19cad62f2973be25fe96a1a9e7f618e8a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/70a38f87bed7f0694fd07988b47b2db1e10d8df3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7ce4c23e783e766507b2cef27bbf97e9ca944f1a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6cd84cefd8b73e85b9eda17b319bd40a670f3a38 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.