CVE-2026-46078
CVE-2026-46078 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: High (CVSS 3.x base score 7.1)
- EPSS exploit prediction: 0% (3rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-32460
- Weakness: CWE-125
- Affected product: Linux Linux Kernel
- Published:
- Last modified:
Description
In the Linux kernel, the following vulnerability has been resolved: erofs: fix the out-of-bounds nameoff handling for trailing dirents Currently we already have boundary-checks for nameoffs, but the trailing dirents are special since the namelens are calculated with strnlen() with unchecked nameoffs. If a crafted EROFS has a trailing dirent with nameoff >= maxsize, maxsize - nameoff can underflow, causing strnlen() to read past the directory block. nameoff0 should also be verified to be a multiple of `sizeof(struct erofs_dirent)` as well [1]. [1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com
Frequently asked questions
- What is CVE-2026-46078?
- In the Linux kernel, the following vulnerability has been resolved: erofs: fix the out-of-bounds nameoff handling for trailing dirents Currently we already have boundary-checks for nameoffs, but the trailing dirents are special since the namelens are calculated with strnlen() with unchecked nameoffs. If a crafted EROFS has a trailing dirent with nameoff >= maxsize, maxsize - nameoff can underflow, causing strnlen() to read past the directory block. nameoff0 should also be verified to be a multiple of `sizeof(struct erofs_dirent)` as well [1]. [1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com
- How severe is CVE-2026-46078?
- CVE-2026-46078 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability high.
- Is CVE-2026-46078 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-2026-46078?
- CVE-2026-46078 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-46078?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-46078 have an EU (EUVD) identifier?
- Yes. CVE-2026-46078 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32460.
- When was CVE-2026-46078 published?
- CVE-2026-46078 was published on 2026-05-27 and last updated on 2026-06-24.
References
- https://git.kernel.org/stable/c/1d55445226c75ddd4e78b09b3e7d99109b28c366
- https://git.kernel.org/stable/c/222055e6b4063abd2d9e13c3d49bbd1724c50789
- https://git.kernel.org/stable/c/48b27a955d22391c7f30169fa7b6b2e1977f1ce4
- https://git.kernel.org/stable/c/80a23c6d1aba35be8746d74ac14e6ba5ae46da21
- https://git.kernel.org/stable/c/8ebb951a284b7446e025afc7dc5e9516ef9a7214
- https://git.kernel.org/stable/c/a8ee527807f7d97e55ce2ef2906f7f34975eb1c7
- https://git.kernel.org/stable/c/aa16dca1b062355181ef215229eeac249d7c0d61
- https://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575
Affected products (1)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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