kernel: cookie feature in packet action API implementation mishandles tb nlattr array
Published Apr 19, 2017
7.8
HIGHCVSS 3.0
EPSS 0.40%
Description
The cookie feature in the packet action API implementation in net/sched/act_api.c in the Linux kernel 4.11.x through 4.11-rc7 mishandles the tb nlattr array, which allows local users to cause a denial of service (uninitialized memory access and refcount underflow, and system hang or crash) or possibly have unspecified other impact via "tc filter add" commands in certain contexts. NOTE: this does not affect stable kernels, such as 4.10.x, from kernel.org.
Affected products
No data.
- 4.11
- 4.11
- 4.11
- 4.11
- 4.11
- 4.11
- 4.11
No data.
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| 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 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AV:L/AC:L/Au:N/C:C/I:C/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 v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.40% (0.00395) | 31.23th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.40% (0.00395) | 31.03th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00044) | 10.70th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.10% (0.01104) | 54.09th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.10% (0.01104) | 28.85th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.24% (0.01242) | 30.15th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.24% (0.01242) | 0.00th | v1 |
References (12)
- http://marc.info/?l=linux-netdev&m=149200742616349 x_refsource_MISCMailing ListPatchThird Party Advisory
- http://marc.info/?l=linux-netdev&m=149200746116365 x_refsource_MISCMailing ListPatchThird Party Advisory
- http://marc.info/?l=linux-netdev&m=149200746116366 x_refsource_MISCMailing ListPatchThird Party Advisory
- http://marc.info/?l=linux-netdev&m=149251041420194 x_refsource_MISCMailing ListPatchThird Party Advisory
- http://marc.info/?l=linux-netdev&m=149251041420195 x_refsource_MISCMailing ListPatchThird Party Advisory
- http://www.securityfocus.com/bid/97969 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2017-7979 Vendor Advisory
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1682368 x_refsource_MISCIssue TrackingPatch
- https://bugzilla.proxmox.com/show_bug.cgi?id=1351 x_refsource_MISCIssue TrackingPatch
- https://bugzilla.redhat.com/show_bug.cgi?id=1444501 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-7979
- https://www.cve.org/CVERecord?id=CVE-2017-7979
Change history (0)
No recorded changes yet.