CVE-2026-97599
In the Linux kernel, the following vulnerability has been resolved: ieee802154: hwsim: serialize pib updates to fix double-free hwsim_update_pib() does an unserialized read-swap-free of phy->pib: pib_old = rtnl_dereference(phy->pib); ... rcu_assign_pointer(phy->pib, pib); kfree_rcu(pib_old, rcu); It assumes the RTNL is held, but ->set_channel is not always called under it: the mac802154 scan worker changes channels via drv_set_channel() without the RTNL. Such an update can race an RTNL-held one on the same phy; both read the same pib_old and both kfree_rcu() it, double-freeing the object. With SLUB percpu sheaves batching kfree_rcu(), this surfaces as a KASAN invalid-free in rcu_free_sheaf(). struct hwsim_phy has no lock for pib. Add one and make the swap atomic with rcu_replace_pointer() under it, dropping the misleading rtnl_dereference().
Affected versions
Linux kernel versions
4.19
and later are affected. Fixed in
6.6.158,
6.12.111,
6.18.53,
7.2.7,
7.3-rc3
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-97599?
CVE-2026-97599 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.19 onward and has been patched in 6.6.158, 6.12.111, 6.18.53 and others. CVE-2026-97599 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-97599?
Yes. CVE-2026-97599 has been patched. Fixed versions include 6.6.158, 6.12.111, 6.18.53 and others. If you are running Linux kernel 4.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-97599 actively exploited?
No. CVE-2026-97599 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.