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NVD / CVE Program· CNA Linux

CVE-2026-80917: PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 008cb88edb41f3c7c8e0ed763ff9f26719830984, 0916948026f623844acd08888f7cbedbf1c48d6b, 0c55707bd5d0d7670704cfd0dda933809b052f67; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 008cb88edb41f3c7c8e0ed763ff9f26719830984, 0916948026f623844acd08888f7cbedbf1c48d6b, 0c55707bd5d0d7670704cfd0dda933809b052f67; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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]

—No exploit Fix available
Published
Sep 9, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 0b5877a1aeacdbf32b3bea91326592004ec7806f, a037ebbe72a4f98495b193112e2b2000e5e09eb5, 5.14affected
    • 8fe55ef23387ce3c7488375b1fd539420d7654bb and later · before 5e52eb0290f66ba0732956dcb1e365b5ca3c5108affected · git
    • 8fe55ef23387ce3c7488375b1fd539420d7654bb and later · before baf9b0383ff770fdff123d3a832f3a99641d96ddaffected · git
    • 8fe55ef23387ce3c7488375b1fd539420d7654bb and later · before 8d08713ec83a18526d1ed1fd5f0d2b901d103a10affected · git
    • 8fe55ef23387ce3c7488375b1fd539420d7654bb and later · before 74456843f18ba7f3045974d7e8b88ab993152b8caffected · git
    • 8fe55ef23387ce3c7488375b1fd539420d7654bb and later · before 0c55707bd5d0d7670704cfd0dda933809b052f67affected · git
    • 8fe55ef23387ce3c7488375b1fd539420d7654bb and later · before a199293f3038db8d31d47aa60f1e18272cd82354affected · git
    • 8fe55ef23387ce3c7488375b1fd539420d7654bb and later · before 0916948026f623844acd08888f7cbedbf1c48d6baffected · git
    • 8fe55ef23387ce3c7488375b1fd539420d7654bb and later · before 008cb88edb41f3c7c8e0ed763ff9f26719830984affected · git
    • 5.12.19 and later · before 5.13affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.107-16.12.107-1
Debian:14linuxbefore 7.1.12-17.1.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80914Sep 9, 2026 · Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready
    35Monitor
  • ← EarlierCVE-2026-80916Sep 9, 2026 · kcov: fix data corruption and race conditions on PREEMPT_RT
    0Monitor
  • Later →CVE-2026-80918Sep 9, 2026 · HID: core: fix number/pointer type confusion on long items
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux008cb88edb41f3c7c8e0ed763ff9f26719830984Vendor (CNA)
Linux Linux0916948026f623844acd08888f7cbedbf1c48d6bVendor (CNA)
Linux Linux0c55707bd5d0d7670704cfd0dda933809b052f67Vendor (CNA)
Linux Linux5.13Vendor (CNA)
Linux Linux5.14Vendor (CNA)
Linux Linux5e52eb0290f66ba0732956dcb1e365b5ca3c5108Vendor (CNA)
Linux Linux74456843f18ba7f3045974d7e8b88ab993152b8cVendor (CNA)
Linux Linux8d08713ec83a18526d1ed1fd5f0d2b901d103a10Vendor (CNA)
Linux Linuxa199293f3038db8d31d47aa60f1e18272cd82354Vendor (CNA)
Linux Linuxbaf9b0383ff770fdff123d3a832f3a99641d96ddVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records