kernel: NFSv4 server does not properly validate layout type when processing NFSv4 pNFS LAYOUTGET operand
Published Jul 2, 2017
7.5
HIGHCVSS 3.1
EPSS 9.48%
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.
Affected products
No data.
- ≥ 4.0 · < 4.1.40
- ≥ 4.2 · < 4.4.70
- ≥ 4.5 · < 4.9.30
- ≥ 4.11 · < 4.11.3
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-693.el7
Fixed · RHSA-2017:1842
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-693.rt56.617.el7
Fixed · RHSA-2017:2077
Red Hat Enterprise Linux 7.3 Extended Update Support
kernel-0:3.10.0-514.28.1.el7
Fixed · RHSA-2017:2437
Red Hat Enterprise MRG 2
kernel-rt-1:3.10.0-693.2.1.rt56.585.el6rt
Fixed · RHSA-2017:2669
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-alt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-693.el7 | Fixed | RHSA-2017:1842 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-693.rt56.617.el7 | Fixed | RHSA-2017:2077 |
| Red Hat Enterprise Linux 7.3 Extended Update Support | kernel-0:3.10.0-514.28.1.el7 | Fixed | RHSA-2017:2437 |
| Red Hat Enterprise MRG 2 | kernel-rt-1:3.10.0-693.2.1.rt56.585.el6rt | Fixed | RHSA-2017:2669 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-alt | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6 as the code with the flaw is not present in the products listed. This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2. Future kernel updates for these products may address this issue.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (21 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 9.48% (0.09483) | 95.29th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.67% (0.08665) | 94.41th | v5 (v2026.06.15) |
| Feb 4, 2026 | 30.42% (0.30423) | 96.57th | v4 (v2025.03.14) |
| Nov 21, 2025 | 31.79% (0.31791) | 96.60th | v4 (v2025.03.14) |
| Nov 18, 2025 | 49.01% (0.49006) | 97.64th | v4 (v2025.03.14) |
| May 21, 2025 | 31.79% (0.31791) | 96.54th | v4 (v2025.03.14) |
| Mar 30, 2025 | 30.69% (0.30692) | 96.33th | v4 (v2025.03.14) |
| Mar 29, 2025 | 34.98% (0.34981) | 95.40th | v4 (v2025.03.14) |
| Mar 17, 2025 | 30.69% (0.30692) | 96.32th | v4 (v2025.03.14) |
| Dec 17, 2024 | 74.78% (0.74777) | 98.35th | v3 (v2023.03.01) |
| Oct 6, 2023 | 87.41% (0.87415) | 98.26th | v3 (v2023.03.01) |
| May 8, 2023 | 89.51% (0.89512) | 98.21th | v3 (v2023.03.01) |
| Apr 17, 2023 | 86.54% (0.86544) | 98.02th | v3 (v2023.03.01) |
| Mar 7, 2023 | 88.85% (0.88855) | 98.08th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.78% (0.03779) | 85.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.78% (0.03779) | 84.01th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.78% (0.03779) | 67.21th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.60% (0.03597) | 68.40th | v1 |
| Jan 6, 2022 | 3.60% (0.03597) | 68.10th | v1 |
| Sep 1, 2021 | 3.60% (0.03597) | 82.09th | v1 |
| Apr 14, 2021 | 3.60% (0.03597) | 0.00th | v1 |
References (16)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b550a32e60a4941994b437a8d662432a486235a5 x_refsource_MISCPatchVendor Advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f961e3f2acae94b727380c0b74e2d3954d0edf79 x_refsource_MISCPatchVendor Advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.3 x_refsource_MISCRelease NotesVendor Advisory
- http://www.openwall.com/lists/oss-security/2017/06/27/5 x_refsource_MISCMailing ListPatchVDB Entry
- http://www.securityfocus.com/bid/99298 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038790 vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:1842 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2077 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2437 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2669 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-8797 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1466329 x_refsource_MISCIssue TrackingThird Party AdvisoryVDB Entry
- https://github.com/torvalds/linux/commit/b550a32e60a4941994b437a8d662432a486235a5 x_refsource_MISCPatchThird Party Advisory
- https://github.com/torvalds/linux/commit/f961e3f2acae94b727380c0b74e2d3954d0edf79 x_refsource_MISCPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-8797
- https://www.cve.org/CVERecord?id=CVE-2017-8797
Change history (0)
No recorded changes yet.