Vulnerability in Linux Kernel
CVE-2015-7550
The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel before 4.3.4 does not properly use a semaphore, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/79903 (vdb-entry)
- www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4 (Vendor Advisory)
- www.ubuntu.com/usn/USN-2911-1 (vendor-advisory)
- www.ubuntu.com/usn/USN-2890-3 (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html (vendor-advisory)
- bugzilla.redhat.com/show_bug.cgi
- github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d
- www.ubuntu.com/usn/USN-2911-2 (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html (vendor-advisory)
- www.ubuntu.com/usn/USN-2890-2 (vendor-advisory)
Frequently asked questions
- What is CVE-2015-7550?
- CVE-2015-7550 is a medium-severity vulnerability in Linux Kernel, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.5/10. Published 2016-02-08.
- How severe is CVE-2015-7550?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2015-7550 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.