CVE-2026-52952: Linux Kernel vulnerability (CVSS 8.8)

Description

In the Linux kernel, the following vulnerability has been resolved: iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset In __iommu_group_set_domain_internal(), concurrent domain attachments are rejected when any device in the group is recovering. This is necessary to fence concurrent attachments to a multi-device group where devices might share the same RID due to PCI DMA alias quirks, but triggers the WARN_ON in __iommu_group_set_domain_nofail(). Other IOMMU_SET_DOMAIN_MUST_SUCCEED callers in detach/teardown paths, such as __iommu_group_set_core_domain and __iommu_release_dma_ownership, should not be rejected, as the domain would be freed anyway in these nofail paths while group->domain is still pointing to it. So pci_dev_reset_iommu_done() could trigger a UAF when re-attaching group->domain. Honor the IOMMU_SET_DOMAIN_MUST_SUCCEED flag, allowing the callers through the group->recovery_cnt fence, so as to update the group->domain pointer. Instead add a gdev->blocked check in the device iteration loop, to prevent any concurrent per-device detachment.

CVSS 3.1 breakdown

Attack vectorLocal

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Linux Kernel≥ 7.0 < 7.0.10 · 7.1

Remediation

Fixed in

Linux Kernel≥ 7.0.10

Patch & vendor advisories

References

https://access.redhat.com/security/cve/CVE-2026-52952Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2492422Third Party Advisory
https://git.kernel.org/stable/c/5474e6e17a262db45c60575c73f70210f5c7001fPatch
https://git.kernel.org/stable/c/8fc289e809f3eb7e36cadc4684ab6fad747a5a93Patch
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52952.jsonThird Party Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-52952 being actively exploited?

CVE-2026-52952 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.18%.

How severe is CVE-2026-52952?

CVE-2026-52952 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.18% probability of exploitation.

Which products are affected by CVE-2026-52952?

Affected products include Linux Kernel.

How do I fix CVE-2026-52952?

Upgrade affected software to a fixed version, for example Linux Kernel 7.0.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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