CVE-2017-8797
HIGHCVSS 7.5/10EPSS 8.67%
Last modified
CVE-2017-8797 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when processing the NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker. This type value is uninitialized upon encountering certain error conditions. EPSS estimates a 8.67% chance of exploitation in the next 30 days.
Description
The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when processing the NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker. This type value is uninitialized upon encountering certain error conditions. This value is used as an array index for dereferencing, which leads to an OOPS and eventually a DoS of knfsd and a soft-lockup of the whole system.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.0, < 4.1.40 |
| Linux | Linux Kernel | >= 4.2, < 4.4.70 |
| Linux | Linux Kernel | >= 4.5, < 4.9.30 |
| Linux | Linux Kernel | >= 4.11, < 4.11.3 |
References
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.3Release Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2017/06/27/5Mailing List, Patch, VDB Entry
- http://www.securityfocus.com/bid/99298Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038790Broken Link, Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:1842Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2077Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2437Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2669Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1466329Issue Tracking, Third Party Advisory, VDB Entry
- https://github.com/torvalds/linux/commit/b550a32e60a4941994b437a8d662432a486235a5Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/f961e3f2acae94b727380c0b74e2d3954d0edf79Patch, Third Party Advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.3Release Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2017/06/27/5Mailing List, Patch, VDB Entry
- http://www.securityfocus.com/bid/99298Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038790Broken Link, Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:1842Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2077Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2437Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2669Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1466329Issue Tracking, Third Party Advisory, VDB Entry
- https://github.com/torvalds/linux/commit/b550a32e60a4941994b437a8d662432a486235a5Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/f961e3f2acae94b727380c0b74e2d3954d0edf79Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2017-8797?
The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when processing the NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker. This type value is uninitialized upon encountering certain error conditions. This value is used as an array index for dereferencing, which leads to an OOPS and eventually a DoS of knfsd and a soft-lockup of the whole system.
How severe is CVE-2017-8797?
CVE-2017-8797 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 8.67% probability of exploitation in the next 30 days.
How do I fix CVE-2017-8797?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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