CVE-2025-37836 | PCI: Fix reference leak in pci_register_host_bridge()

In the Linux kernel, the following vulnerability has been resolved: PCI: Fix reference leak in pci_register_host_bridge() If device_register() fails, call put_device() to give up the reference to avoid a memory leak, per the comment at device_register(). Found by code review. [bhelgaas: squash Dan Carpenter's double free fix from https://lore.kernel.org/r/[email protected]]

Published: 2025-05-09 Last update: 2026-06-17 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-37836 is rated Low Risk (27.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.25%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-37836

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.07% 0.25% +0.18%
2 2026-03-05 0.01% 0.07% +0.05%
3 2025-11-15 — 0.01% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-37836

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2025-37836

OS Trackers for CVE-2025-37836

vendor priority summary link
debian not yet assigned CVE-2025-37836 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. https://security-tracker.debian.org/tracker/CVE-2025-37836
redhat medium — https://access.redhat.com/security/cve/CVE-2025-37836
suse medium — https://www.suse.com/security/cve/CVE-2025-37836/
ubuntu medium CVE-2025-37836 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, ignored 165, released 162, needed 40, not-affected 36, needs-triage 2, pending 1. https://ubuntu.com/security/CVE-2025-37836

Affected software / configurations for CVE-2025-37836

Vendor Product Version Raw CPE
linux linux_kernel >= 4.10, < 5.10.237 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.11, < 5.15.181 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.136 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.6.89 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.7, < 6.12.24 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.13, < 6.13.12 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.14, < 6.14.3 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2025-37836

URL Tags
https://git.kernel.org/stable/c/3297497ad2246eb9243849bfbbc57a0dea97d76e Patch
https://git.kernel.org/stable/c/804443c1f27883926de94c849d91f5b7d7d696e9 Patch
https://git.kernel.org/stable/c/9707d0c932f41006a2701afc926b232b50e356b4 Patch
https://git.kernel.org/stable/c/b783478e0c53ffb4f04f25fb4e21ef7f482b05df Patch
https://git.kernel.org/stable/c/bbba4c50a2d2a1d3f3bf31cc4b8280cb492bf2c7 Patch
https://git.kernel.org/stable/c/bd2a352a0d72575f1842d28c14c10089f0cfe1ae Patch
https://git.kernel.org/stable/c/f4db1b2c9ae3d013733c302ee70cac943b7070c0 Patch
https://git.kernel.org/stable/c/f9208aec86226524ec1cb68a09ac70e974ea6536 Patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html Mailing List Third Party Advisory
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