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CVE-2021-47527 is a Linux kernel serial-core flaw in which the UART transmit buffer was not freed on a serial port's final close after uart_close() was converted to use tty_port_close(). Consequently, a subsequent open could retain uncleared transmit-buffer state. IOCTL operations that wait for the transmit buffer to drain, including termios changes, could wait indefinitely; stale buffered data could be transmitted if transmission restarts; and buffers associated with previously opened ports could leak when a serial driver is unbound. The fix clears the transmit-buffer pointer under the port lock and frees the buffer after final close.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel serial-core flaw involving transmit-buffer reset handling and a memory leak.
Linux kernel serial-core memory-leak flaw.
Unknown
A low-severity Linux kernel serial-core vulnerability involving improper transmit-buffer reset and a memory leak. Fixed kernel versions listed include 4.9.292, 4.14.257, 4.19.220, 5.4.164, 5.10.84, 5.15.7, and 5.16; Red Hat also addressed it in Red Hat Enterprise Linux 8 and RHEL 9.4 Extended Update Support.
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.