ipv4: fib: bound automatic table ID allocation
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 7 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4: fib: bound automatic table ID allocation fib_empty_table() probes every table ID from 1 until it finds a free one. IPv4 tables are stored in a 256-bucket hash table, so a dense set of IDs makes each probe walk a growing hash chain while RTNL is held. Automatic table assignment ("ip rule ... table 0") is an IPv4-only legacy path. Bound the automatically allocated ID to 4096 so the RTNL hold stays bounded, without changing lookups of explicitly specified table IDs. This changes user-visible behavior. A table-0 rule previously received the lowest free ID in 1..RT_TABLE_MAX (0xFFFFFFFF). After this patch the search stops at 4096 and the rule add fails with ENOBUFS if that range is fully occupied. Explicit table IDs above 4096 remain usable. The automatic path is unused in practice: it is IPv4-only, not documented by ip-rule, uncovered by kernel selftests, and both NetworkManager and systemd refuse table 0.
Why it matters now
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 |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.19 and later | 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.19 and later Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-97598
- 2026-10-03 Alias added: GHSA-9pxv-wwmf-9jpr
- 2026-10-03 Fix available: Linux/Linux@125890702ef4417cd0ffac2e448c0cd4fbf0ac45, Linux/Linux@3080f9e653d8c057d5652db5ced8137f81b3fcbd, Linux/[email protected] +5 · CNA
- 2026-10-03 4 new references · CNA
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/999bc00588cb305ab25065e8a8ac31da7465301c
- https://git.kernel.org/stable/c/f1f2da33eaab54b4d5cdea6d70befb2e2fb49cb6
- https://git.kernel.org/stable/c/125890702ef4417cd0ffac2e448c0cd4fbf0ac45
- https://git.kernel.org/stable/c/3080f9e653d8c057d5652db5ced8137f81b3fcbd
- https://git.kernel.org/stable/c/bc8d01d856db106f284b19961af6112e10c3e3b4
- https://git.kernel.org/stable/c/fe9a906d2bff2d2707bafd6353b5e032a42aeb35
- https://git.kernel.org/stable/c/2c29c053a6627dc4f12fcfe6b4860bcd9e5d7503
- https://git.kernel.org/stable/c/efdfb1e27a3328085b79540dfe781d537b576ea1
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Sources
- CVE-2026-97598 · CVE Program
- CVE-2026-97598 · NVD
- FIRST EPSS
- GHSA-9pxv-wwmf-9jpr · GitHub Advisory Database · CC BY 4.0
- CVE-2026-97598 · Red Hat security data · CC BY 4.0
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