Vulnerability-Lookup

OPENSUSE-SU-2025:15553-1

Vulnerability from csaf_opensuse - Published: 2025-09-14 00:00 - Updated: 2025-09-14 00:00

Summary

kernel-devel-6.16.7-1.1 on GA media

Notes

Title of the patch

kernel-devel-6.16.7-1.1 on GA media

Description of the patch

These are all security issues fixed in the kernel-devel-6.16.7-1.1 package on the GA media of openSUSE Tumbleweed.

Patchnames

openSUSE-Tumbleweed-2025-15553

CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).

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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/vmscape: Add conditional IBPB mitigation\n\nVMSCAPE is a vulnerability that exploits insufficient branch predictor\nisolation between a guest and a userspace hypervisor (like QEMU). Existing\nmitigations already protect kernel/KVM from a malicious guest. Userspace\ncan additionally be protected by flushing the branch predictors after a\nVMexit.\n\nSince it is the userspace that consumes the poisoned branch predictors,\nconditionally issue an IBPB after a VMexit and before returning to\nuserspace. Workloads that frequently switch between hypervisor and\nuserspace will incur the most overhead from the new IBPB.\n\nThis new IBPB is not integrated with the existing IBPB sites. For\ninstance, a task can use the existing speculation control prctl() to\nget an IBPB at context switch time. With this implementation, the\nIBPB is doubled up: one at context switch and another before running\nuserspace.\n\nThe intent is to integrate and optimize these cases post-embargo.\n\n[ dhansen: elaborate on suboptimal IBPB solution ]",
          "title": "CVE description"
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      "title": "CVE-2025-40300"
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  ]
}

CVE-2025-40300 (GCVE-0-2025-40300)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:49 – Updated: 2026-01-02 15:33

Title

x86/vmscape: Add conditional IBPB mitigation

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/vmscape: Add conditional IBPB mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing mitigations already protect kernel/KVM from a malicious guest. Userspace can additionally be protected by flushing the branch predictors after a VMexit. Since it is the userspace that consumes the poisoned branch predictors, conditionally issue an IBPB after a VMexit and before returning to userspace. Workloads that frequently switch between hypervisor and userspace will incur the most overhead from the new IBPB. This new IBPB is not integrated with the existing IBPB sites. For instance, a task can use the existing speculation control prctl() to get an IBPB at context switch time. With this implementation, the IBPB is doubled up: one at context switch and another before running userspace. The intent is to integrate and optimize these cases post-embargo. [ dhansen: elaborate on suboptimal IBPB solution ]

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/ac60717f9a8d21c58…
	https://git.kernel.org/stable/c/c08192b5d6730a914…
	https://git.kernel.org/stable/c/d5490dfa35427a296…
	https://git.kernel.org/stable/c/2f4f2f8f860cb4c33…
	https://git.kernel.org/stable/c/15006289e5c38b2a8…
	https://git.kernel.org/stable/c/893387c18612bb452…
	https://git.kernel.org/stable/c/f866eef8d1c65504d…
	https://git.kernel.org/stable/c/34e5667041050711a…
	https://git.kernel.org/stable/c/d7ddc93392e4a7ffc…
	https://git.kernel.org/stable/c/459274c77b37ac63b…
	https://git.kernel.org/stable/c/510603f504796c353…
	https://git.kernel.org/stable/c/9c23a90648e831d61…
	https://git.kernel.org/stable/c/2f8f173413f1cbf52…

Impacted products

Vendor

Product

Version

Linux

Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < ac60717f9a8d21c58617d0b34274babf24135835 (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < c08192b5d6730a914dee6175bc71092ee6a65f14 (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < d5490dfa35427a2967e00a4c7a1b95fdbc8ede34 (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < 2f4f2f8f860cb4c3336a7435ebe8dcfded0c9c6e (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < 15006289e5c38b2a830e1fba221977a27598176c (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < 893387c18612bb452336a5881da0d015a7e8f4a2 (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < f866eef8d1c65504d30923c3f14082ad294d0e6d (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < 34e5667041050711a947e260fc9ebebe08bddee5 (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < d7ddc93392e4a7ffcccc86edf6ef3e64c778db52 (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < 459274c77b37ac63b78c928b4b4e748d1f9d05c8 (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < 510603f504796c3535f67f55fb0b124a303b44c8 (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < 9c23a90648e831d611152ac08dbcd1283d405e7f (git)
Affected: 15d45071523d89b3fb7372e2135fbd72f6af9506 , < 2f8f173413f1cbf52660d04df92d0069c4306d25 (git)
Affected: c51f1e5f57cca88d8d5894b6fad1638f643a99d0 (git)
Affected: 4b3870c343a82cd2df7192cc5149c87205dcc611 (git)

Linux

Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.244 , ≤ 5.10.* (semver)
Unaffected: 5.15.193 , ≤ 5.15.* (semver)
Unaffected: 6.1.152 , ≤ 6.1.* (semver)
Unaffected: 6.6.106 , ≤ 6.6.* (semver)
Unaffected: 6.12.47 , ≤ 6.12.* (semver)
Unaffected: 6.16.7 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/vmscape: Add conditional IBPB mitigation\n\nVMSCAPE is a vulnerability that exploits insufficient branch predictor\nisolation between a guest and a userspace hypervisor (like QEMU). Existing\nmitigations already protect kernel/KVM from a malicious guest. Userspace\ncan additionally be protected by flushing the branch predictors after a\nVMexit.\n\nSince it is the userspace that consumes the poisoned branch predictors,\nconditionally issue an IBPB after a VMexit and before returning to\nuserspace. Workloads that frequently switch between hypervisor and\nuserspace will incur the most overhead from the new IBPB.\n\nThis new IBPB is not integrated with the existing IBPB sites. For\ninstance, a task can use the existing speculation control prctl() to\nget an IBPB at context switch time. With this implementation, the\nIBPB is doubled up: one at context switch and another before running\nuserspace.\n\nThe intent is to integrate and optimize these cases post-embargo.\n\n[ dhansen: elaborate on suboptimal IBPB solution ]"
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        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/d7ddc93392e4a7ffcccc86edf6ef3e64c778db52"
        },
        {
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        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/9c23a90648e831d611152ac08dbcd1283d405e7f"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f8f173413f1cbf52660d04df92d0069c4306d25"
        }
      ],
      "title": "x86/vmscape: Add conditional IBPB mitigation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40300",
    "datePublished": "2025-09-11T16:49:24.809Z",
    "dateReserved": "2025-04-16T07:20:57.185Z",
    "dateUpdated": "2026-01-02T15:33:23.260Z",
    "state": "PUBLISHED"
  },
  "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

OPENSUSE-SU-2025:15553-1

CVE-2025-40300 (GCVE-0-2025-40300)

Tags

Sightings

Nomenclature