Expired Pointer Dereference Affecting kernel-64k-modules-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-KERNEL64KMODULESCORE-19207987
- published23 Aug 2026
- disclosed15 Aug 2026
Introduced: 15 Aug 2026
NewCVE-2026-74465 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-64k-modules-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-64k-modules-core package and not the kernel-64k-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: openvswitch: fix potential UAF on meter attach failure
While attaching a newly created meter attach_meter() function makes the new meter visible to other CPUs but can still fail afterwards. On failure, it detaches the meter back and returns an error.
However, this is an unexpected behavior for the ovs_meter_cmd_set() that uses a plain kfree(meter) on attach failure without waiting for RCU readers to stop using it, assuming it was never visible.
This is never a problem for ovs-vswitchd as it always creates meters before creating any flows that use them. But the UAF can be triggered with a custom application using uAPI:
BUG: KASAN: slab-use-after-free in ovs_meter_execute (net/openvswitch/meter.c:653) Read of size 8 at addr ffff88810d152650 by task meter/2508
Call Trace: ovs_meter_execute (net/openvswitch/meter.c:653) do_execute_actions (net/openvswitch/actions.c:1407) ovs_execute_actions (net/openvswitch/actions.c:1584) ovs_packet_cmd_execute (net/openvswitch/datapath.c:703) ... netlink_sendmsg (af_netlink.c:1900)
Allocated by task 2519: __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415) ovs_meter_cmd_set (net/openvswitch/meter.c:422) ... netlink_sendmsg (af_netlink.c:1900)
Freed by task 2519: kfree (mm/slub.c:2705 mm/slub.c:6405 mm/slub.c:6720) ovs_meter_cmd_set (net/openvswitch/meter.c:479) ... netlink_sendmsg (af_netlink.c:1900)
Fix that by making sure attach_meter() doesn't make the meter visible until all the checks are done and the function can't fail anymore.
This also makes sure the "hash" value is calculated after the potential re-sizing of the table.
Reported by Trend Micro's Zero Day Initiative as ZDI-CAN-31642.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2516982
- https://access.redhat.com/security/cve/CVE-2026-74465
- https://git.kernel.org/stable/c/0310d1fa7f9debd0d89629e9f14c7975a47eaa9a
- https://git.kernel.org/stable/c/431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61
- https://git.kernel.org/stable/c/4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3
- https://git.kernel.org/stable/c/90623c9499627803ef3f04fa25a3199402d4fb95
- https://git.kernel.org/stable/c/a58a2b0ce354df531ebc71fc870058c2feb59f6b
- https://git.kernel.org/stable/c/496f3013c6ff759249abcfb2da2361c1a3e2e66d
- https://git.kernel.org/stable/c/b0de3b58dac3b02b528f72ee0397728aed11f993
- https://git.kernel.org/stable/c/ddc0ef4217cc697c6ba1a295cc1ea42423ec68ac