Not yet scoredPublished Dec 4, 2025

CVE-2025-40219PCI/IOV: Fix race between SR-IOV enable/disable and hotplug

Updated under an hour ago (Oct 27, 2026, 3:30 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: PCI/IOV: Fix race between SR-IOV enable/disable and hotplug Commit 05703271c3cd ("PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV") tried to fix a race between the VF removal inside sriov_del_vfs() and concurrent hot unplug by taking the PCI rescan/remove lock in sriov_del_vfs(). Similarly the PCI rescan/remove lock was also taken in sriov_add_vfs() to protect addition of VFs. This approach however causes deadlock on trying to remove PFs with SR-IOV enabled because PFs disable SR-IOV during removal and this removal happens under the PCI rescan/remove lock. So the original fix had to be reverted. Instead of taking the PCI rescan/remove lock in sriov_add_vfs() and sriov_del_vfs(), fix the race that occurs with SR-IOV enable and disable vs hotplug higher up in the callchain by taking the lock in sriov_numvfs_store() before calling into the driver's sriov_configure() callback.

CVSS: Not yet scored
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: Deferred
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	18f9e9d150fccfa747875df6f0a9f606740762b3 builds before 3cddde484471c602bea04e6f384819d336a1ff84; from 18f9e9d150fccfa747875df6f0a9f606740762b3 before d7673ac466eca37ec3e6b7cc9ccdb06de3304e9b; 18f9e9d150fccfa747875df6f0a9f606740762b3 builds before 7c37920c96b85ef4255a7acc795e99e63dd38d59; from 18f9e9d150fccfa747875df6f0a9f606740762b3 before 1047ca2d816994f31e1475e63e0c0b7825599747; from 18f9e9d150fccfa747875df6f0a9f606740762b3 before 97c18f074ff1c12d016a0753072a3afdfa0b9611; from 18f9e9d150fccfa747875df6f0a9f606740762b3 before bea1d373098b22d7142da48750ce5526096425bc; from 18f9e9d150fccfa747875df6f0a9f606740762b3 before f3015627b6e9ddf85cfeaf42405b3c194dde2c36; from 18f9e9d150fccfa747875df6f0a9f606740762b3 before a5338e365c4559d7b4d7356116b0eb95b12e08d5	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

References

References

https://git.kernel.org/stable/c/3cddde484471c602bea04e6f384819d336a1ff84
https://git.kernel.org/stable/c/d7673ac466eca37ec3e6b7cc9ccdb06de3304e9b
https://git.kernel.org/stable/c/7c37920c96b85ef4255a7acc795e99e63dd38d59
https://git.kernel.org/stable/c/1047ca2d816994f31e1475e63e0c0b7825599747
https://git.kernel.org/stable/c/97c18f074ff1c12d016a0753072a3afdfa0b9611
https://git.kernel.org/stable/c/bea1d373098b22d7142da48750ce5526096425bc
https://git.kernel.org/stable/c/f3015627b6e9ddf85cfeaf42405b3c194dde2c36
https://git.kernel.org/stable/c/a5338e365c4559d7b4d7356116b0eb95b12e08d5
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
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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.