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CVE-2026-3497 is a flaw in downstream GSSAPI Key Exchange patches carried by various Linux distributions; upstream OpenSSH is not affected. In server-side GSSAPI KEX error handling, the patch invokes sshpkt_disconnect(), which queues a disconnect and returns, where ssh_packet_disconnect(), which terminates processing, was required. An unexpected GSSAPI message can therefore cause error-handling fallthrough and use an uninitialized recv_tok stack variable. The value is passed through the privilege-separation IPC path and subsequently to gss_release_buffer(), which may free an invalid pointer. Resulting behavior depends materially on the distribution patch variant and compiler hardening, optimization, and memory-layout characteristics.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
32 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSH GSSAPI vulnerability that can cause information disclosure or denial of service due to uninitialized variables.
An OpenSSH GSSAPI vulnerability that can cause information disclosure or denial of service due to uninitialized variables.
An OpenSSH GSSAPI vulnerability that can cause information disclosure or denial of service due to uninitialized variables.
An OpenSSH GSSAPI flaw caused by uninitialized variables that can result in information disclosure or denial of service.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.