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CVE-2023-51780 is a use-after-free vulnerability in the Linux kernel ATM networking driver. In kernels prior to 6.6.8, the do_vcc_ioctl function in net/atm/ioctl.c can race with vcc_recvmsg on the SIOCINQ ioctl path, which reports unread bytes in a receive buffer. The race can cause the ioctl to operate on freed state and return an incorrect unread-buffer-size value.
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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.
If you can’t patch tonight, do this now.
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.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Vulnerability addressed by the AlmaLinux 9.2 TuxCare advisory.
A vulnerability included in the TuxCare AlmaLinux 9.2 kernel security update advisory.
Linux kernel ATM ioctl use-after-free vulnerability.
Linux kernel use-after-free vulnerability in ATM ioctl handling.
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.