CVE-2009-2406: Stack-based buffer overflow in the parse_tag_11_packet function in fs/ecryptfs/keystore.c in the eCryptfs s...

Security readout for executives and security teams

CVE-2009-2406 is a Linux kernel eCryptfs flaw that could let a local user crash a system, and possibly gain higher privileges, by using a crafted eCryptfs file. The issue is old and fixed in Linux 2.6.30.4 and vendor kernel updates, but legacy systems may remain exposed. Exposure is most likely on legacy Linux hosts running kernels before 2.6.30.4 or equivalent unpatched vendor kernels, especially where eCryptfs is enabled or encrypted home/file storage is used. Modern maintained distributions are unlikely to be affected if kernel security updates are current. Treat this as a legacy Linux exposure cleanup item with higher priority for shared servers, research systems, and environments with local shell users. It is not supported as internet-facing remote exploitation in the provided evidence, but possible privilege gain makes unpatched multi-user systems business-relevant. Mitigation focus: Apply vendor kernel security updates for affected distributions.; Upgrade upstream kernels to 2.6.30.4 or later where applicable.; Prioritize multi-user Linux systems and hosts using eCryptfs..

Prepared

Jun 28, 2026, 10:26 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.