What’s Vulnerable › Vulnerabilities
CVE-2023-4273: Kernel: exfat: stack overflow in exfat_get_uniname_from_ext_entry
- Severity: medium (CVSS 6.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2023-08-09 · updated 2026-10-14
- Weakness: CWE-121
Description
A flaw was found in the exFAT driver of the Linux kernel. The vulnerability exists in the implementation of the file name reconstruction function, which is responsible for reading file name entries from a directory index and merging file name parts belonging to one file into a single long file name. Since the file name characters are copied into a stack variable, a local privileged attacker could use this flaw to overflow the kernel stack.
Affected products
- Debian Linux: 11.0, 12.0
- Fedoraproject Fedora: 37, 38
- Linux kernel: before 6.4; 6.5-rc1, 6.5-rc2, 6.5-rc3, 6.5-rc4 — fixed in 6.4
- NetApp H300S Firmware: all versions
- NetApp H410S Firmware: all versions
- NetApp H500S Firmware: all versions
- NetApp H700S Firmware: all versions
- Red Hat Enterprise Linux: 9.0
How to fix
Upgrade to a fixed version: Linux kernel 6.4. Check the vendor advisory for mitigations.
References
- https://access.redhat.com/errata/RHSA-2023:6583
- https://access.redhat.com/security/cve/CVE-2023-4273
- https://bugzilla.redhat.com/show_bug.cgi?id=2221609
- https://dfir.ru/2023/08/23/cve-2023-4273-a-vulnerability-in-the-linux-exfat-driver/
- https://access.redhat.com/errata/RHSA-2023:6583
- https://access.redhat.com/security/cve/CVE-2023-4273
- https://bugzilla.redhat.com/show_bug.cgi?id=2221609
- https://dfir.ru/2023/08/23/cve-2023-4273-a-vulnerability-in-the-linux-exfat-driver/
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/344H6HO6SSC4KT7PDFXSDIXKMKHISSGF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TYLSJ2SAI7RF56ZLQ5CQWCJLVJSD73Q/
- https://security.netapp.com/advisory/ntap-20231027-0002/
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