CVE-2026-90111

CVE CVE-2026-90111EUVD EUVD-2026-81704Published 2026-09-17T16:06:18.000ZLast changed 2026-09-18T17:53:06.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: ip6mr: do not clone dst in ip6mr_cache_report() IPv6 input attaches a non-refcounted (NOREF) dst to skbs under RCU. When an ingress multicast packet misses MFC lookup, ip6mr_cache_unresolved() places the skb onto the unresolved queue, escaping the receive-side RCU grace period. If the underlying route is deleted and freed, and the MFC queue is later resolved with a wrong parent interface, ip6_mr_forward() invokes ip6mr_cache_report(..., MRT6MSG_WRONGMIF), which executes dst_clone(skb_dst(pkt)) on the freed dst entry, triggering a slab use-after-free. Report packets queued to mroute6_sk (a raw socket) and netlink notifications do not require an attached dst entry. Fix this by: 1. Removing dst_clone() in ip6mr_cache_report() and ensuring report skbs do not hold a dst. 2. Dropping skb_dst before queuing unresolved skbs in ip6mr_cache_unresolved(), matching the fact that multicast forwarding resolves outgoing routes anew via ip6_route_output().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 67f415dd29063a5906c560051c00e42dcf01a4dd <235b42b5860189eb8c27c36435ad932cae65a734; patch: 0; patch: 7.2.6; 5.3; patch: 7.3-rc1; 67f415dd29063a5906c560051c00e42dcf01a4dd <4a674afaae4136c71943aa3e35d433676fd40e8f

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Carried in the product catalogue

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Linux — Linux

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