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In the Linux kernel, the following vulnerability has been resolved:
xfrm: hold net_device reference under RCU in bundle creation
xfrm_bundle_create() and xfrm_create_dummy_bundle() read dst->dev into a local pointer without taking a device reference, then pass it to xfrm_fill_dst(). A concurrent RTM_DELLINK replaces dst->dev via dst_dev_put() and frees the old net_device, causing a use-after-free when xfrm6_fill_dst() later dereferences the stale dev pointer.
BUG: KASAN: slab-use-after-free in xfrm6_fill_dst+0x82c/0x860 (net/ipv6/xfrm6_policy.c:86 netdev_hold()) Read of size 8 at addr ffff8880142fe588 by task exploit/153 Call Trace: xfrm6_fill_dst+0x82c/0x860 xfrm_resolve_and_create_bundle+0x21d4/0x2bd0 xfrm_lookup_with_ifid+0x485/0x1640 ip6_dst_lookup_flow+0x19b/0x1e0 udpv6_sendmsg+0x1443/0x2dd0
Fix this by reading dst->dev via dst_dev_rcu() and keeping the RCU read-side critical section active until xfrm_fill_dst() has taken the required device references.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel-livepatch-6.18.56-125.164Upgrade kernel6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-toolsUpgrade kernel6.18-headersUpgrade python3-perf6.18-debuginfoUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-tools-debuginfoUpgrade microvm-kernel6.18Upgrade kernel6.18Upgrade kernel6.18-develUpgrade kernel6.18-modules-extra-commonUpgrade python3-perf6.18Upgrade kernel6.18-tools-develUpgrade kernel6.18-debuginfo-common-x86_64Upgrade perf6.18Upgrade kernel6.18-modules-extraUpgrade bpftool6.18 | Oct 28, 2026 | Oct 6, 2026 |
| Redhat_linux | — | No solution exists | Oct 13, 2026 | Oct 6, 2026 |
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