| Name | CVE-2015-8952 |
| Description | The 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| linux (PTS) | jessie, jessie (lts) | 3.16.84-1 | vulnerable |
| stretch (security) | 4.9.320-2 | fixed |
| stretch (lts), stretch | 4.9.320-3 | fixed |
| buster (security), buster, buster (lts) | 4.19.316-1 | fixed |
| bullseye | 5.10.223-1 | fixed |
| bullseye (security) | 5.10.226-1 | fixed |
| bookworm | 6.1.115-1 | fixed |
| bookworm (security) | 6.1.112-1 | fixed |
| trixie | 6.11.7-1 | fixed |
| sid | 6.11.9-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| linux | source | (unstable) | 4.6.1-1 | low | | |
Notes
[jessie] - linux <ignored> (Minor issue and too intrusive to backport, workaround exists with the no_mbcache mount flag)
[wheezy] - linux <no-dsa> (Minor issue and too intrusive to backport)
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)