Race Condition Affecting kernel-rt package, versions <0:3.10.0-693.rt56.617.el7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS7-KERNELRT-2087870
- published26 Jul 2021
- disclosed24 Mar 2017
Introduced: 24 Mar 2017
CVE-2017-2671 (opens in a new tab)How to fix?
Upgrade Centos:7 kernel-rt to version 0:3.10.0-693.rt56.617.el7 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
The ping_unhash function in net/ipv4/ping.c in the Linux kernel through 4.10.8 is too late in obtaining a certain lock and consequently cannot ensure that disconnect function calls are safe, which allows local users to cause a denial of service (panic) by leveraging access to the protocol value of IPPROTO_ICMP in a socket system call.
References
- http://www.securityfocus.com/bid/97407
- https://github.com/torvalds/linux/commit/43a6684519ab0a6c52024b5e25322476cabad893
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/net/ipv4/ping.c?id=43a6684519ab0a6c52024b5e25322476cabad893
- https://access.redhat.com/security/cve/CVE-2017-2671
- https://www.exploit-db.com/exploits/42135/
- https://github.com/danieljiang0415/android_kernel_crash_poc
- https://twitter.com/danieljiang0415/status/845116665184497664
- http://openwall.com/lists/oss-security/2017/04/04/8
- https://access.redhat.com/errata/RHSA-2017:2077
- https://usn.ubuntu.com/3754-1/
- https://bugzilla.redhat.com/show_bug.cgi?id=1436649