CVE-2026-80917PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems
- —Not scoredno CVSS score yet
- 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: host-generic: Fix NULL pointer dereference on 32-bit CAM systems On 32-bit systems the config space is too large to ioremap in one go, so pci_ecam_create() maps each bus segment separately and relies on the ->add_bus callback (pci_ecam_add_bus) to populate the per-bus mapping in cfg->winp[]. pci_ecam_map_bus() then uses that mapping as the base for every config access. The generic ECAM ops (pci_generic_ecam_ops) already provide the ->add_bus and ->remove_bus callbacks, but the CAM (legacy) ops in pci-host-generic.c do not. As a result, on a 32-bit host using "pci-host-cam-generic" the per-bus mapping is never set up and the first config read dereferences a NULL base, crashing during bus enumeration: Unable to handle kernel NULL pointer dereference at virtual address 00000800 Oops [#1] CPU: 0 PID: 1 Comm: swapper Not tainted 6.9.7+ #43 Hardware name: Digilent Nexys-Video-A7 RV32 (DT) epc : pci_generic_config_read+0x40/0xb0 ra : pci_generic_config_read+0x2c/0xb0 [<c038db9c>] pci_generic_config_read+0x40/0xb0 [<c038da04>] pci_bus_read_config_dword+0x50/0xb0 [<c0391e94>] pci_bus_generic_read_dev_vendor_id+0x3c/0x1ec [<c039245c>] pci_scan_single_device+0xa4/0x11c [<c0392570>] pci_scan_slot+0x9c/0x23c [<c039388c>] pci_scan_child_bus_extend+0x58/0x2f4 [<c0393db0>] pci_scan_root_bus_bridge+0x64/0xe8 [<c0393e54>] pci_host_probe+0x20/0xc8 [<c03bc6f4>] pci_host_common_probe+0x144/0x1e4 Fix this by giving the CAM ops the same ->add_bus/->remove_bus callbacks. Since pci_ecam_add_bus() and pci_ecam_remove_bus() are static to ecam.c, move the CAM ops definition there as pci_generic_cam_ops (mirroring pci_generic_ecam_ops) and export it for pci-host-generic.c to reference. [mani: removed timestamp from log]
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 40 days later
· 40 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 8fe55ef23387ce3c7488375b1fd539420d7654bb – < 5e52eb0290f66ba0732956dcb1e365b5ca3c5108
- affected 8fe55ef23387ce3c7488375b1fd539420d7654bb – < baf9b0383ff770fdff123d3a832f3a99641d96dd
- affected 8fe55ef23387ce3c7488375b1fd539420d7654bb – < 8d08713ec83a18526d1ed1fd5f0d2b901d103a10
- affected 8fe55ef23387ce3c7488375b1fd539420d7654bb – < 74456843f18ba7f3045974d7e8b88ab993152b8c
- affected 8fe55ef23387ce3c7488375b1fd539420d7654bb – < 0c55707bd5d0d7670704cfd0dda933809b052f67
- affected 8fe55ef23387ce3c7488375b1fd539420d7654bb – < a199293f3038db8d31d47aa60f1e18272cd82354
- affected 8fe55ef23387ce3c7488375b1fd539420d7654bb – < 0916948026f623844acd08888f7cbedbf1c48d6b
- affected 8fe55ef23387ce3c7488375b1fd539420d7654bb – < 008cb88edb41f3c7c8e0ed763ff9f26719830984
- affected 0b5877a1aeacdbf32b3bea91326592004ec7806f
- affected a037ebbe72a4f98495b193112e2b2000e5e09eb5
- affected 5.12.19 – < 5.13
- affected 5.13.4 – < 5.14
- affected 5.14
- unaffected < 5.14
- unaffected 5.15.218 – ≤ 5.15.*
- unaffected 6.1.185 – ≤ 6.1.*
- unaffected 6.6.154 – ≤ 6.6.*
- unaffected 6.12.106 – ≤ 6.12.*
- unaffected 6.18.47 – ≤ 6.18.*
- unaffected 7.1.11 – ≤ 7.1.*
- unaffected 7.2.1 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/5e52eb0290f66ba0732956dcb1e365b5ca3c5108 (opens in a new tab)
- https://git.kernel.org/stable/c/baf9b0383ff770fdff123d3a832f3a99641d96dd (opens in a new tab)
- https://git.kernel.org/stable/c/8d08713ec83a18526d1ed1fd5f0d2b901d103a10 (opens in a new tab)
- https://git.kernel.org/stable/c/74456843f18ba7f3045974d7e8b88ab993152b8c (opens in a new tab)
- https://git.kernel.org/stable/c/0c55707bd5d0d7670704cfd0dda933809b052f67 (opens in a new tab)
- https://git.kernel.org/stable/c/a199293f3038db8d31d47aa60f1e18272cd82354 (opens in a new tab)
- https://git.kernel.org/stable/c/0916948026f623844acd08888f7cbedbf1c48d6b (opens in a new tab)
- https://git.kernel.org/stable/c/008cb88edb41f3c7c8e0ed763ff9f26719830984 (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-2026-75092 (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-2026-80917)Record last updated .