CVE-2026-31403NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd
Updated under an hour ago ()
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It affects Linux and 4 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd The /proc/fs/nfs/exports proc entry is created at module init and persists for the module's lifetime. exports_proc_open() captures the caller's current network namespace and stores its svc_export_cache in seq->private, but takes no reference on the namespace. If the namespace is subsequently torn down (e.g. container destruction after the opener does setns() to a different namespace), nfsd_net_exit() calls nfsd_export_shutdown() which frees the cache. Subsequent reads on the still-open fd dereference the freed cache_detail, walking a freed hash table. Hold a reference on the struct net for the lifetime of the open file descriptor. This prevents nfsd_net_exit() from running -- and thus prevents nfsd_export_shutdown() from freeing the cache -- while any exports fd is open. cache_detail already stores its net pointer (cd->net, set by cache_create_net()), so exports_release() can retrieve it without additional per-file storage.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before 76740c28050dc6db2f5550f1325b00a11bbb3255; from 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before c7f406fb341d6747634b8b1fa5461656e5e56076; from 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before d1a19217995df9c7e4118f5a2820c5032fef2945; from 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before e3d77f935639e6ae4b381c80464c31df998d61f4; from 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6; 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 builds before 6a8d70e2ad6aad2c345a5048edcb8168036f97d6; from 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 before e7fcf179b82d3a3730fd8615da01b087cc654d0b | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 3.9 before 5.10.253; from 5.11 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.10; 7.0; 7.0; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/76740c28050dc6db2f5550f1325b00a11bbb3255patch
- https://git.kernel.org/stable/c/c7f406fb341d6747634b8b1fa5461656e5e56076patch
- https://git.kernel.org/stable/c/d1a19217995df9c7e4118f5a2820c5032fef2945patch
- https://git.kernel.org/stable/c/e3d77f935639e6ae4b381c80464c31df998d61f4patch
- https://git.kernel.org/stable/c/db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6patch
- https://git.kernel.org/stable/c/6a8d70e2ad6aad2c345a5048edcb8168036f97d6patch
- https://git.kernel.org/stable/c/e7fcf179b82d3a3730fd8615da01b087cc654d0bpatch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
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.