The cookie feature in the packet action API implementation in net/sched/act_api.c in the…
Priority LOW 34CWE-20Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.00395 33rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:4.11:rc1:*:*:*:*:*:* | 4.11 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.11:rc2:*:*:*:*:*:* | 4.11 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.11:rc3:*:*:*:*:*:* | 4.11 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.11:rc4:*:*:*:*:*:* | 4.11 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.11:rc5:*:*:*:*:*:* | 4.11 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.11:rc6:*:*:*:*:*:* | 4.11 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.11:rc7:*:*:*:*:*:* | 4.11 rc7 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:4.11:rc1:*:*:*:*:*:* Versions 4.11 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.11:rc2:*:*:*:*:*:* Versions 4.11 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.11:rc3:*:*:*:*:*:* Versions 4.11 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.11:rc4:*:*:*:*:*:* Versions 4.11 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.11:rc5:*:*:*:*:*:* Versions 4.11 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.11:rc6:*:*:*:*:*:* Versions 4.11 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.11:rc7:*:*:*:*:*:* Versions 4.11 rc7 Vulnerable ·Linux
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise MRG 2
Timeline
- 2026-10-02 Threatist record created from CVE-2017-7979
- 2026-10-03 Alias added: GHSA-94wh-pgqj-7f7r
References
Patch 7
- http://marc.info/?l=linux-netdev&m=149251041420195
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1682368
- https://bugzilla.proxmox.com/show_bug.cgi?id=1351
- http://marc.info/?l=linux-netdev&m=149200742616349
- http://marc.info/?l=linux-netdev&m=149200746116365
- http://marc.info/?l=linux-netdev&m=149251041420194
- http://marc.info/?l=linux-netdev&m=149200746116366
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2017-7979 · CVE Program
- CVE-2017-7979 · NVD
- FIRST EPSS
- GHSA-94wh-pgqj-7f7r · GitHub Advisory Database · CC BY 4.0
- CVE-2017-7979 · Red Hat security data · CC BY 4.0
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