Vulnerability-Lookup

FKIE_CVE-2025-39823

Vulnerability from fkie_nvd - Published: 2025-09-16 13:16 - Updated: 2026-01-16 20:38

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: use array_index_nospec with indices that come from guest min and dest_id are guest-controlled indices. Using array_index_nospec() after the bounds checks clamps these values to mitigate speculative execution side-channels.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Third Party Advisory, Mailing List
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory, Mailing List

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
debian	debian_linux	11.0

JSON

To clipboard

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CVE-2025-39823 (GCVE-0-2025-39823)

Vulnerability from cvelistv5 – Published: 2025-09-16 13:00 – Updated: 2025-11-03 17:43

Title

KVM: x86: use array_index_nospec with indices that come from guest

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/72777fc31aa7ab2ce…
	https://git.kernel.org/stable/c/31a0ad2f60cb4816e…
	https://git.kernel.org/stable/c/d51e381beed5e2f50…
	https://git.kernel.org/stable/c/33e974c2d5a82b2f9…
	https://git.kernel.org/stable/c/f49161646e03d107c…
	https://git.kernel.org/stable/c/67a05679621b7f721…
	https://git.kernel.org/stable/c/f57a4bd8d6cb5af05…
	https://git.kernel.org/stable/c/c87bd4dd43a624109…

Impacted products

Vendor

Product

Version

Linux

Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < 72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48 (git)
Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < 31a0ad2f60cb4816e06218b63e695eb72ce74974 (git)
Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < d51e381beed5e2f50f85f49f6c90e023754efa12 (git)
Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < 33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f (git)
Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < f49161646e03d107ce81a99c6ca5da682fe5fb69 (git)
Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < 67a05679621b7f721bdba37a5d18665d3aceb695 (git)
Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < f57a4bd8d6cb5af05b8ac1be9098e249034639fb (git)
Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < c87bd4dd43a624109c3cc42d843138378a7f4548 (git)

Linux

Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.4.298 , ≤ 5.4.* (semver)
Unaffected: 5.10.242 , ≤ 5.10.* (semver)
Unaffected: 5.15.191 , ≤ 5.15.* (semver)
Unaffected: 6.1.150 , ≤ 6.1.* (semver)
Unaffected: 6.6.104 , ≤ 6.6.* (semver)
Unaffected: 6.12.45 , ≤ 6.12.* (semver)
Unaffected: 6.16.5 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

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.

Action not permitted

FKIE_CVE-2025-39823

CVE-2025-39823 (GCVE-0-2025-39823)

Tags

Sightings

Nomenclature