Use of Multiple Resources with Duplicate Identifier Affecting kernel-rt-modules-core package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-KERNELRTMODULESCORE-21382450
- published21 Oct 2026
- disclosed18 Oct 2026
Introduced: 18 Oct 2026
NewCVE-2026-98629 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-rt-modules-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-core package and not the kernel-rt-modules-core package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net/sched: cls_u32: fix manual hash table handle IDR aliasing
A u32 hash table created with an explicit handle ('tc filter add ... handle 801: u32 divisor N') keys its IDR entry on the raw handle, while the destroy paths free it under handle2id(handle). The two key domains disagree for handles in the 0x800..0xFFF htid range: handle2id() folds them back into the auto-allocated id space (1..0x7FF).
A manual table therefore leaves its raw-keyed IDR entry unreachable on delete (a permanent leak), and its delete can drop the idr entry of an unrelated live auto table. A later auto allocation can then hand out a handle that aliases the live manual table; u32_lookup_ht() first-match routes lookups and TCA_U32_LINK for that htid to the wrong table.
Key the divisor-path alloc on handle2id(handle) so allocation and removal share one key domain. A manual handle that maps onto an id already in use is rejected with -ENOSPC, and auto allocation skips ids held by live manual tables.
Conditions to recreate:
ip link add test0 type dummy
tc qdisc add dev test0 clsact
tc filter add dev test0 ingress protocol ip pref 1
handle 801: u32 divisor 16
tc filter add dev test0 ingress protocol ip pref 2 u32 divisor 16
tc -d filter show dev test0 ingress | grep 'fh 801:'
unpatched: two live tables with handle 0x80100000 (the pref 2 root
hnode is auto-allocated id 1); patched: the auto hnode takes id 2.
Also tested with a poc with a live u32 table on the block, add/delete a manual table 'handle 901: u32 divisor 1' twice; unpatched, the re-add fails with -ENOSPC because the raw key leaked on the first delete.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2554917
- https://access.redhat.com/security/cve/CVE-2026-98629
- https://git.kernel.org/stable/c/0a5f5d9e94dead312d32c366b917c64e552b72f7
- https://git.kernel.org/stable/c/0fac292d93fdb313099e98cce928b3a524c92c94
- https://git.kernel.org/stable/c/21fc07924e996e1e661268ca269c86b8d59d25b3
- https://git.kernel.org/stable/c/2f898f9ec7c73c5697ee462681e7ea6984ee1f3d
- https://git.kernel.org/stable/c/54a454c5e41f5e2cb70c8163140ce095c5d5eefd
- https://git.kernel.org/stable/c/f6696481eedfd5752b4b56eed715d0b0fe48b9c5