CVE-2026-89795PCI: Allow per function PCI slots to fix slot reset on s390
- 8.4HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: PCI: Allow per function PCI slots to fix slot reset on s390 On s390 systems, which use a machine level hypervisor, PCI devices are always accessed through a form of PCI pass-through which fundamentally operates on a per PCI function granularity. This is also reflected in the s390 PCI hotplug driver which creates hotplug slots for individual PCI functions. Its reset_slot() function, which is a wrapper for zpci_hot_reset_device(), thus also resets individual functions. Currently, the pci_create_slot() assigns the same pci_slot object to multifunction devices. This approach worked fine on s390 systems that only exposed virtual functions as individual PCI domains to the operating system. Since commit 44510d6fa0c0 ("s390/pci: Handling multifunctions") s390 supports exposing the topology of multifunction PCI devices by grouping them in a shared PCI domain. This creates a problem when resetting a function through the hotplug driver's slot_reset() interface. When attempting to reset a function through the hotplug driver, the shared slot assignment causes the wrong function to be reset instead of the intended one. It also leaks memory as we do create a pci_slot object for the function, but don't correctly free it in pci_slot_release(). Add a flag for struct pci_slot to allow per function PCI slots for functions managed through a hypervisor, which exposes individual PCI functions while retaining the topology. Since we can use all 8 bits for slot 'number' (for ARI devices), change slot 'number' u16 to account for special values PCI_SLOT_PLACEHOLDER and PCI_SLOT_ALL_DEVICES.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 44 days later
· 44 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Affected products
- affected 44510d6fa0c00aa90b80075caa6b313b25927475 – < afdd497ca3836eda13530ab75b416d52f6d6129a
- affected 44510d6fa0c00aa90b80075caa6b313b25927475 – < b4a80e9e639cf09ef5c66b7f262c9cb5ab37bdde
- affected 44510d6fa0c00aa90b80075caa6b313b25927475 – < 0d1a7d67f45645106578d65181e4e492dd20ed79
- affected 44510d6fa0c00aa90b80075caa6b313b25927475 – < 2050d900f9adbd6d6f38d30e182bcd9ad3108467
- affected 44510d6fa0c00aa90b80075caa6b313b25927475 – < ecdcceed4d377b02d4ea036b65f83f962c38ede7
- affected 44510d6fa0c00aa90b80075caa6b313b25927475 – < dcc5bec09e23bbc4f9de055a11fce9937244f2c8
- affected 5.8
- unaffected < 5.8
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.5 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/afdd497ca3836eda13530ab75b416d52f6d6129a (opens in a new tab)
- https://git.kernel.org/stable/c/b4a80e9e639cf09ef5c66b7f262c9cb5ab37bdde (opens in a new tab)
- https://git.kernel.org/stable/c/0d1a7d67f45645106578d65181e4e492dd20ed79 (opens in a new tab)
- https://git.kernel.org/stable/c/2050d900f9adbd6d6f38d30e182bcd9ad3108467 (opens in a new tab)
- https://git.kernel.org/stable/c/ecdcceed4d377b02d4ea036b65f83f962c38ede7 (opens in a new tab)
- https://git.kernel.org/stable/c/dcc5bec09e23bbc4f9de055a11fce9937244f2c8 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-80395 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89795)Record last updated .