CVE-2015-8839

Severity: medium (CVSS 5.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-05-02 · updated 2026-06-17
Weakness: CWE-362

Description

Multiple race conditions in the ext4 filesystem implementation in the Linux kernel before 4.5 allow local users to cause a denial of service (disk corruption) by writing to a page that is associated with a different user's file after unsynchronized hole punching and page-fault handling.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04
Linux kernel: through 4.4.221; 4.5-rc1, 4.5-rc2, 4.5-rc3, 4.5-rc4, 4.5-rc5, 4.5-rc6 (+1)

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ea3d7209ca01da209cda6f0dea8be9cc4b7a933b
http://www.openwall.com/lists/oss-security/2016/04/01/4
http://www.securityfocus.com/bid/85798
http://www.securitytracker.com/id/1035455
http://www.ubuntu.com/usn/USN-3005-1
http://www.ubuntu.com/usn/USN-3006-1
http://www.ubuntu.com/usn/USN-3007-1
https://access.redhat.com/errata/RHSA-2017:1842
https://access.redhat.com/errata/RHSA-2017:2077
https://access.redhat.com/errata/RHSA-2017:2669
https://bugzilla.redhat.com/show_bug.cgi?id=1323577
https://github.com/torvalds/linux/commit/ea3d7209ca01da209cda6f0dea8be9cc4b7a933b

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