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CVE-2026-97939

UnknownEPSS 0.21%

Last modified

CVE-2026-97939 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

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").

Metrics

EPSS Probability
0.21%

10.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= f0ad0860d01e47a3ffd220564c5c653b3afbe962, < 3e808d8dfebd8f114a747bd90c8f7d2a6fd7474f; >= f0ad0860d01e47a3ffd220564c5c653b3afbe962, < 57c523e95ea2608a19e6bfcd664d641ddf7bc4b4; >= f0ad0860d01e47a3ffd220564c5c653b3afbe962, < 20424f267c9dbdfcade28b2b2306767a7dfb43d1; >= f0ad0860d01e47a3ffd220564c5c653b3afbe962, < 21e0749e8ef272ac7e3eefe0fa488a5983f4b038; >= f0ad0860d01e47a3ffd220564c5c653b3afbe962, < ec1c6140394ee87127479bc500a3158b125bf07a; >= f0ad0860d01e47a3ffd220564c5c653b3afbe962, < 0264b3ee09b118fec8a5471b4ca288f8ab84722f; >= f0ad0860d01e47a3ffd220564c5c653b3afbe962, < d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c; >= f0ad0860d01e47a3ffd220564c5c653b3afbe962, < b7ee18725f2292ab554aa96a101ae42d45f008bd
LinuxLinux2.6.35

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-97939?
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").
How severe is CVE-2026-97939?
Severity scoring for CVE-2026-97939 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-97939?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST