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CVE-2026-31433
Description
A flaw was found in the ksmbd module of the Linux kernel. A remote attacker can exploit this vulnerability by sending a specially crafted compound request, specifically a combination of QUERY_DIRECTORY and QUERY_INFO. Due to a missing validation check for the client-provided output buffer length, an out-of-bounds write can occur when processing filenames. This can lead to memory corruption, potentially causing a denial of service or other unpredictable system behavior.
- Bugzilla 2460536: kernel: ksmbd: fix potencial OOB in get_file_all_info() for compound requests
- CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Frequently Asked Questions
For more information, see https://access.redhat.com/solutions/762393.
- "Under investigation" doesn't necessarily mean that the product is affected by this vulnerability. It only means that our Analysis Team is still working on determining whether the product is affected and how it is affected.
- The term 'Affected' means that our Analysis team has determined that this product, such as Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to address this issue in the near future. This includes all minor releases of this product unless noted otherwise in the Statement text.
Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
- Upgrade to a supported product version that includes a fix for this vulnerability (recommended).
- Apply a mitigation (if one exists).
- Customers with the Technical Account Manager (TAM) RHEL Security Select Add-on can review this CVE directly with their TAM.
Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
- Apply a mitigation (if one exists).
- Red Hat Engineering focuses on addressing high-priority issues based on the impact and product lifecycle expectations. Therefore, lower-priority issues will not receive immediate fixes.
- Customers with the technical account manager (TAM) RHEL Security Select Add-on can review this CVE directly with their TAM.
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