CVE-2025-22031 (GCVE-0-2025-22031)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:11 – Updated: 2025-10-01 17:05
VLAI?
Title
PCI/bwctrl: Fix NULL pointer dereference on bus number exhaustion
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI/bwctrl: Fix NULL pointer dereference on bus number exhaustion When BIOS neglects to assign bus numbers to PCI bridges, the kernel attempts to correct that during PCI device enumeration. If it runs out of bus numbers, no pci_bus is allocated and the "subordinate" pointer in the bridge's pci_dev remains NULL. The PCIe bandwidth controller erroneously does not check for a NULL subordinate pointer and dereferences it on probe. Bandwidth control of unusable devices below the bridge is of questionable utility, so simply error out instead. This mirrors what PCIe hotplug does since commit 62e4492c3063 ("PCI: Prevent NULL dereference during pciehp probe"). The PCI core emits a message with KERN_INFO severity if it has run out of bus numbers. PCIe hotplug emits an additional message with KERN_ERR severity to inform the user that hotplug functionality is disabled at the bridge. A similar message for bandwidth control does not seem merited, given that its only purpose so far is to expose an up-to-date link speed in sysfs and throttle the link speed on certain laptops with limited Thermal Design Power. So error out silently. User-visible messages: pci 0000:16:02.0: bridge configuration invalid ([bus 00-00]), reconfiguring [...] pci_bus 0000:45: busn_res: [bus 45-74] end is updated to 74 pci 0000:16:02.0: devices behind bridge are unusable because [bus 45-74] cannot be assigned for them [...] pcieport 0000:16:02.0: pciehp: Hotplug bridge without secondary bus, ignoring [...] BUG: kernel NULL pointer dereference RIP: pcie_update_link_speed pcie_bwnotif_enable pcie_bwnotif_probe pcie_port_probe_service really_probe
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 665745f274870c921020f610e2c99a3b1613519b , < d93d309013e89631630a12b1770d27e4be78362a (git)
Affected: 665745f274870c921020f610e2c99a3b1613519b , < 1181924af78e5299ddec6e457789c02dd5966559 (git)
Affected: 665745f274870c921020f610e2c99a3b1613519b , < 667f053b05f00a007738cd7ed6fa1901de19dc7e (git)
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    Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.13.11 , ≤ 6.13.* (semver)
Unaffected: 6.14.2 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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If it runs out\\nof bus numbers, no pci_bus is allocated and the \\\"subordinate\\\" pointer in\\nthe bridge\u0027s pci_dev remains NULL.\\n\\nThe PCIe bandwidth controller erroneously does not check for a NULL\\nsubordinate pointer and dereferences it on probe.\\n\\nBandwidth control of unusable devices below the bridge is of questionable\\nutility, so simply error out instead.  This mirrors what PCIe hotplug does\\nsince commit 62e4492c3063 (\\\"PCI: Prevent NULL dereference during pciehp\\nprobe\\\").\\n\\nThe PCI core emits a message with KERN_INFO severity if it has run out of\\nbus numbers.  PCIe hotplug emits an additional message with KERN_ERR\\nseverity to inform the user that hotplug functionality is disabled at the\\nbridge.  A similar message for bandwidth control does not seem merited,\\ngiven that its only purpose so far is to expose an up-to-date link speed\\nin sysfs and throttle the link speed on certain laptops with limited\\nThermal Design Power.  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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.