Wind River Support Network


OVP8-492 : Security Advisory - Linux - CVE-2019-11477

Created: Jun 19, 2019    Updated: Nov 21, 2019
Resolved Date: Jul 16, 2019
Previous ID: LIN8-11054
Found In Version:
Severity: Standard
Applicable for: Wind River Linux 8
Component/s: Kernel


An integer overflow flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS).

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