CVE-2025-37863
CVE-2025-37863 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% (13th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-14127
- Affected product: Linux Linux Kernel
- Published:
- Last modified:
Description
In the Linux kernel, the following vulnerability has been resolved: ovl: don't allow datadir only In theory overlayfs could support upper layer directly referring to a data layer, but there's no current use case for this. Originally, when data-only layers were introduced, this wasn't allowed, only introduced by the "datadir+" feature, but without actually handling this case, resulting in an Oops. Fix by disallowing datadir without lowerdir.
Frequently asked questions
- What is CVE-2025-37863?
- In the Linux kernel, the following vulnerability has been resolved: ovl: don't allow datadir only In theory overlayfs could support upper layer directly referring to a data layer, but there's no current use case for this. Originally, when data-only layers were introduced, this wasn't allowed, only introduced by the "datadir+" feature, but without actually handling this case, resulting in an Oops. Fix by disallowing datadir without lowerdir.
- How severe is CVE-2025-37863?
- CVE-2025-37863 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-2025-37863 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-37863?
- CVE-2025-37863 primarily affects Linux Linux Kernel. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2025-37863?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-37863 have an EU (EUVD) identifier?
- Yes. CVE-2025-37863 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14127.
- When was CVE-2025-37863 published?
- CVE-2025-37863 was published on 2025-05-09 and last updated on 2026-06-17.
References
- https://git.kernel.org/stable/c/0874b629f65320778e7e3e206177770666d9db18
- https://git.kernel.org/stable/c/21d2ffb0e9838a175064c22f3a9de97d1f56f27d
- https://git.kernel.org/stable/c/b9e3579213ba648fa23f780e8d53e99011c62331
- https://git.kernel.org/stable/c/eb3a04a8516ee9b5174379306f94279fc90424c4
Affected products (3)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*
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