How severe is CVE-2026-45974?

CVE-2026-45974 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-45974 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-45974?

CVE-2026-45974 primarily affects Linux Linux Kernel. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-45974?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-45974 have an EU (EUVD) identifier?

Yes. CVE-2026-45974 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32258.

When was CVE-2026-45974 published?

CVE-2026-45974 was published on 2026-05-27 and last updated on 2026-06-17.

CVE-2026-45974

CVE-2026-45974 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32258
Affected product: Linux Linux Kernel
Published: 2026-05-27
Last modified: 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found If btrfs_search_slot_for_read() returns 1, it means we did not find any key greater than or equals to the key we asked for, meaning we have reached the end of the tree and therefore the path is not valid. If this happens we need to break out of the loop and stop, instead of continuing and accessing an invalid path.

Frequently asked questions

What is CVE-2026-45974?: In the Linux kernel, the following vulnerability has been resolved: btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found If btrfs_search_slot_for_read() returns 1, it means we did not find any key greater than or equals to the key we asked for, meaning we have reached the end of the tree and therefore the path is not valid. If this happens we need to break out of the loop and stop, instead of continuing and accessing an invalid path.
How severe is CVE-2026-45974?: CVE-2026-45974 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-45974 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-45974?: CVE-2026-45974 primarily affects Linux Linux Kernel. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-45974?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-45974 have an EU (EUVD) identifier?: Yes. CVE-2026-45974 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32258.
When was CVE-2026-45974 published?: CVE-2026-45974 was published on 2026-05-27 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.10:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.10:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.10:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.10:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.10:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.10:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.10:rc7:*:*:*:*:*:*

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