CVE-2015-7550
MediumThe 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.
CVSS 3.0 score
5.5
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness type
CWE-362CVE-2015-7550 is a Race Condition vulnerability
What is Race Condition?
The product contains a code sequence that can run concurrently with other code, creating unexpected states. Learn more on MITRE CWE
References
The following references provide additional information about CVE-2015-7550 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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Debian Securityhttp://www.debian.org/security/2016/dsa-3434
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Vendor Advisory
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Securityfocushttp://www.securityfocus.com/bid/79903
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Ubuntu Securityhttp://www.ubuntu.com/usn/USN-2888-1
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Ubuntu Securityhttp://www.ubuntu.com/usn/USN-2890-1
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Ubuntu Securityhttp://www.ubuntu.com/usn/USN-2890-2
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Ubuntu Securityhttp://www.ubuntu.com/usn/USN-2890-3
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Ubuntu Securityhttp://www.ubuntu.com/usn/USN-2911-1
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Ubuntu Securityhttp://www.ubuntu.com/usn/USN-2911-2
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Debian Securityhttps://security-tracker.debian.org/tracker/CVE-2015-7550
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PatchKernel patch commithttp://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d
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PatchKernel patch commithttps://github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d
Frequently asked questions
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What is CVE-2015-7550?
CVE-2015-7550 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Race Condition flaw (CWE-362) . CVE-2015-7550 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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What is the CVSS score for CVE-2015-7550?
CVE-2015-7550 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.0). The vector string is
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. -
Is there a patch available for CVE-2015-7550?
No patch is currently available for CVE-2015-7550. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
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Is CVE-2015-7550 actively exploited?
No — CVE-2015-7550 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
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What is Race Condition (CWE-362)?
The product contains a code sequence that can run concurrently with other code, creating unexpected states. View CWE-362 on MITRE CWE →