CVE-2015-8952

NameCVE-2015-8952
DescriptionThe mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6 mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
NVD severitylow (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)wheezy3.2.78-1vulnerable
wheezy (security)3.2.84-1vulnerable
jessie3.16.39-1vulnerable
jessie (security)3.16.36-1+deb8u2vulnerable
stretch4.9.6-3fixed
sid4.9.10-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.6.1-1low

Notes

[jessie] - linux <no-dsa> (Minor issue and too intrusive to backport, workaround exists with the no_mbcache mount flag)
https://git.kernel.org/linus/f9a61eb4e2471c56a63cd804c7474128138c38ac (v4.6-rc1)
https://git.kernel.org/linus/82939d7999dfc1f1998c4b1c12e2f19edbdff272 (v4.6-rc1)
https://git.kernel.org/linus/be0726d33cb8f411945884664924bed3cb8c70ee (v4.6-rc1)

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