CVE-2026-89682
- Source
- https://cve.org/CVERecord?id=CVE-2026-89682
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89682.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-89682
- Downstream
AZL (1)
BELL (1)
DEBIAN (1)
openSUSE (1)
UBUNTU (1)
- Related
- Published
- 2026-09-11T19:46:04Z
- Modified
- 2026-10-24T02:30:58Z
- Severity
-
- 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- nfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
nfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net
nfsd_file_dispose_list_delayed() defers fput() to nfsd service threads via a per-net freeme queue, preventing the shrinker and GC worker from bearing the cost of closing files (see ffb402596147). However, the queue lives in a separately-allocated struct nfsd_fcache_disposal that is freed by nfsd_free_fcache_disposal_net() during per-net teardown. The global shrinker, laundrette, and fsnotify callbacks can still be inside nfsd_file_dispose_list_delayed() dereferencing that pointer, causing a use-after-free.
Inline the spinlock and freeme list directly into struct nfsd_net (as fcache_dispose_lock and fcache_dispose_list), eliminating the separately allocated struct nfsd_fcache_disposal entirely. These fields now have the same lifetime as the net namespace itself, so there is no dangling pointer to chase.
nfsd_file_cache_start_net() now just initializes the inline fields and cannot fail due to allocation. nfsd_file_cache_shutdown_net() drains the inline list directly instead of freeing a separate struct. The alloc/free helpers are removed.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89682.json" }- References
-
- https://git.kernel.org/stable/c/9c8ac7c2b9b150e13b7ad0d0fae54f17747dce67
- https://git.kernel.org/stable/c/ba0ee9e04b7a0356c28d5a2fe445db675d24e572
- https://git.kernel.org/stable/c/bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4
- https://git.kernel.org/stable/c/cadc9036d5a8209f89e7026ddba7cfb1c716b03c
- https://git.kernel.org/stable/c/e6c3a43d0a41f03abae3764fc82a59369360c7e0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89682.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-89682
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced1463b38e7cf34d4cc60f41daff459ad807b2e408Fixede6c3a43d0a41f03abae3764fc82a59369360c7e0Fixed9c8ac7c2b9b150e13b7ad0d0fae54f17747dce67Fixedba0ee9e04b7a0356c28d5a2fe445db675d24e572Fixedcadc9036d5a8209f89e7026ddba7cfb1c716b03cFixedbbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5.10.220Fixed5.11
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5.15.154Fixed5.16
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede8f923e1e9fcc0832a12c8a2461792e5a9544c03
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3bc94fb44f10ef852723e1aeaac6794c5ab16aec