Time-of-check Time-of-use (TOCTOU) Affecting kernel-rt-64k-core package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS10-KERNELRT64KCORE-19388398
- published28 Aug 2026
- disclosed26 Aug 2026
Introduced: 26 Aug 2026
NewCVE-2026-74748 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-rt-64k-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-64k-core package and not the kernel-rt-64k-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:
netfilter: ipset: fix refcount race between list:set GC and swap
__ip_set_put_byindex() resolved the index to a set pointer under RCU, then took ip_set_ref_lock in __ip_set_put() to decrement set->ref. ip_set_swap() holds that same lock while swapping both the ip_set_list slots and the two sets' ref counters, so it can interleave between the dereference and the lock acquisition, leaving the caller to decrement a set whose reference already moved to the other index and hit BUG_ON(set->ref == 0). list_set_gc() reaches this from timer softirq, which the nfnl mutex does not serialize against swap: an expiring list:set member calls list_set_del() -> ip_set_put_byindex() while IPSET_CMD_SWAP runs on the referenced sets.
Resolve the index and decrement under ip_set_ref_lock, as ip_set_swap() already does, keeping the refcount tied to the index rather than to a stale set pointer.
kernel BUG at net/netfilter/ipset/ip_set_core.c:685! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI RIP: 0010:ip_set_put_byindex (net/netfilter/ipset/ip_set_core.c:870) Call Trace: <IRQ> list_set_del (net/netfilter/ipset/ip_set_list_set.c:159) set_cleanup_entries (net/netfilter/ipset/ip_set_list_set.c:181) list_set_gc (net/netfilter/ipset/ip_set_list_set.c:578) call_timer_fn (kernel/time/timer.c:1748) __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2374) run_timer_softirq (kernel/time/timer.c:2405) </IRQ> Kernel panic - not syncing: Fatal exception in interrupt
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2524430
- https://access.redhat.com/security/cve/CVE-2026-74748
- https://git.kernel.org/stable/c/0c88868271653537ed443272dd8e7d13634d214b
- https://git.kernel.org/stable/c/20cb13a523f0a05cb2d0a7d72abae687683712e0
- https://git.kernel.org/stable/c/24ffcb1e1688c55fd2a505f064295cd28eac546d
- https://git.kernel.org/stable/c/97a01de0c6321b7210d30d0a4d60f10f561097c7
- https://git.kernel.org/stable/c/b0aab9dd1a348b99d75ff52765719d0cc2050630
- https://git.kernel.org/stable/c/b891e7a6bb06e0f6560e5932665ac660acd12225
- https://git.kernel.org/stable/c/c21afc7c216a4d257a4f3f300e0791890bc846b9
- https://git.kernel.org/stable/c/cb20da33839f28f590c99f16bafaa6151451c0e8