PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems
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 [] pci_generic_config_read+0x40/0xb0 [] pci_bus_read_config_dword+0x50/0xb0 [] pci_bus_generic_read_dev_vendor_id+0x3c/0x1ec [] pci_scan_single_device+0xa4/0x11c [] pci_scan_slot+0x9c/0x23c [] pci_scan_child_bus_extend+0x58/0x2f4 [] pci_scan_root_bus_bridge+0x64/0xe8 [] pci_host_probe+0x20/0xc8 [] 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_
CVE-2026-80917
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80917
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8fe55ef23387ce3c7488375b1fd539420d7654bb",
"lessThan": "5e52eb0290f66ba0732956dcb1e365b5ca3c5108",
"versionType": "git"
},
{
"status": "affected",
"version": "8fe55ef23387ce3c7488375b1fd539420d7654bb",
"lessThan": "baf9b0383ff770fdff123d3a832f3a99641d96dd",
"versionType": "git"
},
{
"status": "affected",
"version": "8fe55ef23387ce3c7488375b1fd539420d7654bb",
"lessThan": "8d08713ec83a18526d1ed1fd5f0d2b901d103a10",
"versionType": "git"
},
{
"status": "affected",
"version": "8fe55ef23387ce3c7488375b1fd539420d7654bb",
"lessThan": "74456843f18ba7f3045974d7e8b88ab993152b8c",
"versionType": "git"
},
{
"status": "affected",
"version": "8fe55ef23387ce3c7488375b1fd539420d7654bb",
"lessThan": "0c55707bd5d0d7670704cfd0dda933809b052f67",
"versionType": "git"
},
{
"status": "affected",
"version": "8fe55ef23387ce3c7488375b1fd539420d7654bb",
"lessThan": "a199293f3038db8d31d47aa60f1e18272cd82354",
"versionType": "git"
},
{
"status": "affected",
"version": "8fe55ef23387ce3c7488375b1fd539420d7654bb",
"lessThan": "0916948026f623844acd08888f7cbedbf1c48d6b",
"versionType": "git"
},
{
"status": "affected",
"version": "8fe55ef23387ce3c7488375b1fd539420d7654bb",
"lessThan": "008cb88edb41f3c7c8e0ed763ff9f26719830984",
"versionType": "git"
},
{
"status": "affected",
"version": "0b5877a1aeacdbf32b3bea91326592004ec7806f",
"versionType": "git"
},
{
"status": "affected",
"version": "a037ebbe72a4f98495b193112e2b2000e5e09eb5",
"versionType": "git"
},
{
"status": "affected",
"version": "5.12.19",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.13.4",
"lessThan": "5.14",
"versionType": "semver"
}
],
"programFiles": [
"drivers/pci/controller/pci-host-generic.c",
"drivers/pci/ecam.c",
"include/linux/pci-ecam.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.154",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.106",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.47",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.11",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.1",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/pci/controller/pci-host-generic.c",
"drivers/pci/ecam.c",
"include/linux/pci-ecam.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80917
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34880 · Revision 1
- Added to Heist Feed
- Publisher date