SB2017042434 - Fedora 25 update for kernel
Published: April 24, 2017 Updated: April 24, 2025
Security Bulletin ID
SB2017042434
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Denial of service (CVE-ID: CVE-2017-7645)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to a flaw in the NFSv2/NFSv3 server in the nfsd subsystem. A remote attacker can use a long RPC reply related to net/sunrpc/svc.c, fs/nfsd/nfs3xdr.c, and fs/nfsd/nfsxdr.c. and cause the system to crash.
Successful exploitation of the vulnerability results in denial of service.
2) Information disclosure (CVE-ID: CVE-2017-7889)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to gain access to potentially sensitive information.
The weakness exists in the CONFIG_STRICT_DEVMEM protection mechanism due to an improper enforcement. A local attacker can read or write to kernel memory locations in the first megabyte and bypass slab-allocation access restrictions.
Remediation
Install update from vendor's website.