CVE-2023-53606nfsd: clean up potential nfsd_file refcount leaks in COPY codepath
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In the Linux kernel, the following vulnerability has been resolved: nfsd: clean up potential nfsd_file refcount leaks in COPY codepath There are two different flavors of the nfsd4_copy struct. One is embedded in the compound and is used directly in synchronous copies. The other is dynamically allocated, refcounted and tracked in the client struture. For the embedded one, the cleanup just involves releasing any nfsd_files held on its behalf. For the async one, the cleanup is a bit more involved, and we need to dequeue it from lists, unhash it, etc. There is at least one potential refcount leak in this code now. If the kthread_create call fails, then both the src and dst nfsd_files in the original nfsd4_copy object are leaked. The cleanup in this codepath is also sort of weird. In the async copy case, we'll have up to four nfsd_file references (src and dst for both flavors of copy structure). They are both put at the end of nfsd4_do_async_copy, even though the ones held on behalf of the embedded one outlive that structure. Change it so that we always clean up the nfsd_file refs held by the embedded copy structure before nfsd4_copy returns. Rework cleanup_async_copy to handle both inter and intra copies. Eliminate nfsd4_cleanup_intra_ssc since it now becomes a no-op.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before fd63299db8090307eae66f2aef17c8f00aafa0a9; from e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before b3169b6ffe036b549c296a9e71591d29a1fb3209; from e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before 75b8c681c563ef7e85da6862354efc18d2a08b1b; from e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before 8f565846fbe8182961498d4cbe618b15076a683b; from e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before 6ba434cb1a8d403ea9aad1b667c3ea3ad8b3191f | CNA record |
linux linux_kernel linux:linux_kernel | from 4.20 before 5.10.220; from 5.11 before 5.15.154; from 5.16 before 6.1.16; from 6.2 before 6.2.3 | NVD |
References
- https://git.kernel.org/stable/c/fd63299db8090307eae66f2aef17c8f00aafa0a9patch
- https://git.kernel.org/stable/c/b3169b6ffe036b549c296a9e71591d29a1fb3209patch
- https://git.kernel.org/stable/c/75b8c681c563ef7e85da6862354efc18d2a08b1bpatch
- https://git.kernel.org/stable/c/8f565846fbe8182961498d4cbe618b15076a683bpatch
- https://git.kernel.org/stable/c/6ba434cb1a8d403ea9aad1b667c3ea3ad8b3191fpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.