Redhat Enterprise Linux
CVE-2026-12969
An out-of-bounds read vulnerability exists in dnsmasq's find_soa() function in src/rfc1035.c. When parsing NS section records, extract_name() is called with extrabytes=0, failing to validate that 10 additional bytes exist for fixed-length DNS record fields. A remote attacker controlling a DNS zone can exploit this via a crafted NXDOMAIN response to cause a 10-byte heap out-of-bounds read, potentially accessing stale data from prior transactions.
What this means for your business
- It affects Redhat Enterprise Linux. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
What to do
- 1Check whether your company or your suppliers run Redhat Enterprise Linux, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
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Scoring
- CVSS
- 5.3 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness
- CWE-125
- Assigned by
- secalert@redhat.com
Dates
- Published
- 2026-06-23
- Last modified
- 2026-08-31
- Sources
- NVD
Affected products
- Redhat Enterprise Linux10.0
- Thekelleys Dnsmasq- 2.93
As listed in the NVD configuration data. Not a statement about your estate.