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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已解决以下漏洞： PCI：host-generic：修复 32 位 CAM 系统上的空指针解引用 在 32 位系统上，配置空间过大，无法一次性通过 映射，因此 会为每个总线段单独进行映射，并依赖 回调（ ）来填充 中的每总线映射。随后， 会将该映射作为每次配置访问的基础地址。 通用的 ECAM 操作（ ）已经提供了 和 回调，但 中的 CAM（传统）操作并未提供这些回调。结果是，在 32 位主机上使用 驱动时，每总线映射从未被初始化，第一次配置读取时会解引用一个 NULL 基址，导致在总线枚

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1015

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 8fe55ef23387ce3c7488375b1fd539420d7654bb< 5e52eb0290f66ba0732956dcb1e365b5ca3c5108 affected
8fe55ef23387ce3c7488375b1fd539420d7654bb< baf9b0383ff770fdff123d3a832f3a99641d96dd affected
8fe55ef23387ce3c7488375b1fd539420d7654bb< 8d08713ec83a18526d1ed1fd5f0d2b901d103a10 affected
8fe55ef23387ce3c7488375b1fd539420d7654bb< 74456843f18ba7f3045974d7e8b88ab993152b8c affected
8fe55ef23387ce3c7488375b1fd539420d7654bb< 0c55707bd5d0d7670704cfd0dda933809b052f67 affected
8fe55ef23387ce3c7488375b1fd539420d7654bb< a199293f3038db8d31d47aa60f1e18272cd82354 affected
8fe55ef23387ce3c7488375b1fd539420d7654bb< 0916948026f623844acd08888f7cbedbf1c48d6b affected
8fe55ef23387ce3c7488375b1fd539420d7654bb< 008cb88edb41f3c7c8e0ed763ff9f26719830984 affected
… +14 more rows
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I. Basic Information for CVE-2026-80917

Vulnerability Information
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Vulnerability Title
PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems
Source: CVE Program / CVE List V5
Vulnerability 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]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8fe55ef23387ce3c7488375b1fd539420d7654bb ~ 5e52eb0290f66ba0732956dcb1e365b5ca3c5108 -
Linux Linux 5.14 -

II. Public POCs for CVE-2026-80917

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III. Intelligence Information for CVE-2026-80917

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Patches & Fixes for CVE-2026-80917 (8)

Same Patch Batch · Linux · 2026-09-09 · 12 CVEs total

CVE-2026-80925 vlan: fix skb_under_panic and races when toggling HW VLAN offload
CVE-2026-80924 crypto: krb5 - use kfree_sensitive() for derived key buffers
CVE-2026-80923 xhci: dbgtty: Fix unregister on tty_register_driver() failure
CVE-2026-80922 crypto: qcom-rng - Allow zero as a random number
CVE-2026-80921 KVM: s390: vsie: zero stale crypto bits
CVE-2026-80920 io_uring: defer eventfd signaling when queued from a wakeup handler
CVE-2026-80919 drm/amdgpu: fix recursive ww_mutex acquire in amdgpu_devcoredump_format
CVE-2026-80918 HID: core: fix number/pointer type confusion on long items
CVE-2026-80916 kcov: fix data corruption and race conditions on PREEMPT_RT
CVE-2026-80915 drm/xe: Fix DPT allocation paths.
CVE-2026-80914 Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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