Missing Release of Resource after Effective Lifetime Affecting kernel-debug-modules-internal package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS8-KERNELDEBUGMODULESINTERNAL-20441178
- published4 Oct 2026
- disclosed25 Sept 2026
Introduced: 25 Sep 2026
NewCVE-2026-97959 (opens in a new tab)How to fix?
There is no fixed version for Centos:8 kernel-debug-modules-internal.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-modules-internal package and not the kernel-debug-modules-internal package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net/sched: cls_route: free emptied bucket on filter move
route4_change can move an existing filter to a different top-level bucket: route4_set_parms recomputes the handle from TCA_ROUTE4_TO/ FROM/IIF, and the handle-mismatch check is gated on the 'new' flag, so for an existing filter the new handle may differ from the old one and land in a different bucket. When this happens, the filter is unlinked from the old bucket, but the bucket itself is never freed once it goes empty. The stale empty bucket remains in head->table[], causing route4_delete to report *last=false even after the last live filter is gone. That pins the empty tcf_proto and causes a leak.
Fix this by refcounting the filters linked to a bucket and freeing the bucket when the count drops to zero. The existing scan in route4_delete goes away with it.
The count is updated at all sites that link or unlink a filter during add, change and delete, and the bucket is dropped from head->table[] as soon as it reaches zero.
Conditions to recreate the bug: CONFIG_NET_CLS_ROUTE4=y, CONFIG_NET_SCH_INGRESS=y, CONFIG_NET_CLS_ACT=y.
tc qdisc replace dev lo clsact
tc filter add dev lo ingress protocol ip pref 100 route from 1 to 1
tc filter change dev lo ingress protocol ip pref 100 handle 0x10001
route from 1 to 2
tc filter del dev lo ingress protocol ip pref 100 handle 0x10002
route from 1 to 2
tc filter show dev lo ingress | grep -c 'pref 100 route chain 0 '
References
- https://access.redhat.com/security/cve/CVE-2026-97959
- https://git.kernel.org/stable/c/1853f30cf5c84971f99788a76207c6f745380896
- https://git.kernel.org/stable/c/2e2f130951d34871b0643bf700164d97cff4b427
- https://git.kernel.org/stable/c/81dd117c04422c6d0c7974aba9fa6a0ba370959b
- https://git.kernel.org/stable/c/f8495d67434e1cb7e511297687ca55fdb28e4c20
- https://git.kernel.org/stable/c/41e94079200aaf0cdbe4594b0af75710b33da124
- https://git.kernel.org/stable/c/48d38bf8c22a05fde07ba1f885cde27b851649a2
- https://git.kernel.org/stable/c/9e7741b41a25b9d49df4d262fa314342e6f95c50
- https://git.kernel.org/stable/c/cc99d26b12431e4e4d0e346ec32764eb42c0aed9