Vulnerability Details : 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 category: Memory CorruptionDenial of service
Products affected by CVE-2015-7550
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2015-7550
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 8 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2015-7550
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.9
|
MEDIUM | AV:L/AC:L/Au:N/C:N/I:N/A:C |
3.9
|
6.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2015-7550
-
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.Assigned by: nvd@nist.gov (Primary)
References for CVE-2015-7550
-
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
[security-announce] SUSE-SU-2016:0911-1: important: Security update for
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http://www.ubuntu.com/usn/USN-2890-3
USN-2890-3: Linux kernel (Raspberry Pi 2) vulnerabilities | Ubuntu security notices
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http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
[security-announce] SUSE-SU-2016:1102-1: important: Security update for
-
https://security-tracker.debian.org/tracker/CVE-2015-7550
CVE-2015-7550
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http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
[security-announce] SUSE-SU-2016:2074-1: important: Security update for
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http://www.debian.org/security/2016/dsa-3434
Debian -- Security Information -- DSA-3434-1 linux
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http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4
Vendor Advisory
-
https://github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d
KEYS: Fix race between read and revoke · torvalds/linux@b4a1b4f · GitHub
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http://www.ubuntu.com/usn/USN-2911-1
USN-2911-1: Linux kernel vulnerability | Ubuntu security notices
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http://www.securityfocus.com/bid/79903
Linux Kernel CVE-2015-7550 Null Pointer Deference Local Denial of Service Vulnerability
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http://www.ubuntu.com/usn/USN-2911-2
USN-2911-2: Linux kernel (OMAP4) vulnerability | Ubuntu security notices
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https://bugzilla.redhat.com/show_bug.cgi?id=1291197
1291197 – (CVE-2015-7550) CVE-2015-7550 kernel: User triggerable crash from race between key read and rey revoke
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http://www.ubuntu.com/usn/USN-2890-1
USN-2890-1: Linux kernel vulnerabilities | Ubuntu security notices
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http://www.ubuntu.com/usn/USN-2888-1
USN-2888-1: Linux kernel (Utopic HWE) vulnerabilities | Ubuntu security notices
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http://www.ubuntu.com/usn/USN-2890-2
USN-2890-2: Linux kernel (Wily HWE) vulnerabilities | Ubuntu security notices
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http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d
kernel/git/torvalds/linux.git - Linux kernel source treeVendor Advisory
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