ipmr: account multicast table and route memory
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- 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: ipmr: account multicast table and route memory A netadmin in a user+net namespace can create many IPv4 and IPv6 multicast routing tables with MRT_TABLE and MRT6_TABLE. Each unseen id allocates an mr_table via the shared mr_table_alloc(), links it into the per-net list, and leaves it until netns teardown. Those objects were not charged to memcg, so the host unreclaimable slab grows with the table count. Account mr_table allocations with GFP_KERNEL_ACCOUNT and mark the IPv4/IPv6 MFC caches SLAB_ACCOUNT. This matches the established handling of IP addresses, routes and alternate interface names. Unresolved MFC entries are still allocated from softIRQ with GFP_ATOMIC and are not charged. They expire after 10 seconds and are bounded by the socket receive queue; see commit 0079ad8e8dc3 ("ipmr: remove hard code cache_resolve_queue_len limit").
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 | 2.6.35 and later | 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.112, 6.18.53, 7.2.7, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.35 and later Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.112, 6.18.53, 7.2.7, 7.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.112, 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-2026-97939
- 2026-10-03 Alias added: GHSA-9pw8-8xmv-73cr
- 2026-10-03 Fix available: Linux/[email protected], Linux/Linux@ec1c6140394ee87127479bc500a3158b125bf07a · CNA
- 2026-10-03 1 new reference · CNA
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Fix available: Linux/Linux@21e0749e8ef272ac7e3eefe0fa488a5983f4b038, Linux/[email protected] · CNA
- 2026-10-21 1 new reference · CNA
- 2026-10-30 Fix available: Linux/Linux@20424f267c9dbdfcade28b2b2306767a7dfb43d1, Linux/Linux@3e808d8dfebd8f114a747bd90c8f7d2a6fd7474f, Linux/[email protected] +3 · CNA
- 2026-10-30 3 new references · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/3e808d8dfebd8f114a747bd90c8f7d2a6fd7474f
- https://git.kernel.org/stable/c/57c523e95ea2608a19e6bfcd664d641ddf7bc4b4
- https://git.kernel.org/stable/c/20424f267c9dbdfcade28b2b2306767a7dfb43d1
- https://git.kernel.org/stable/c/21e0749e8ef272ac7e3eefe0fa488a5983f4b038
- https://git.kernel.org/stable/c/ec1c6140394ee87127479bc500a3158b125bf07a
- https://git.kernel.org/stable/c/0264b3ee09b118fec8a5471b4ca288f8ab84722f
- https://git.kernel.org/stable/c/d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c
- https://git.kernel.org/stable/c/b7ee18725f2292ab554aa96a101ae42d45f008bd
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Sources
- CVE-2026-97939 · CVE Program
- CVE-2026-97939 · NVD
- FIRST EPSS
- GHSA-9pw8-8xmv-73cr · GitHub Advisory Database · CC BY 4.0
- CVE-2026-97939 · Red Hat security data · CC BY 4.0
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