net: openvswitch: fix potential UAF on meter attach failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74465
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:51 UTC
Updated2026-08-15 13:17:51 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c7c4c44c9a95d87e50ced38f7480e779cb472174 0310d1fa7f9debd0d89629e9f14c7975a47eaa9a git Not specified
CNA Linux Linux affected c7c4c44c9a95d87e50ced38f7480e779cb472174 4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3 git Not specified
CNA Linux Linux affected c7c4c44c9a95d87e50ced38f7480e779cb472174 90623c9499627803ef3f04fa25a3199402d4fb95 git Not specified
CNA Linux Linux affected c7c4c44c9a95d87e50ced38f7480e779cb472174 431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61 git Not specified
CNA Linux Linux affected c7c4c44c9a95d87e50ced38f7480e779cb472174 a58a2b0ce354df531ebc71fc870058c2feb59f6b git Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0310d1fa7f9debd0d89629e9f14c7975a47eaa9a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a58a2b0ce354df531ebc71fc870058c2feb59f6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/90623c9499627803ef3f04fa25a3199402d4fb95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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