ieee802154: hwsim: serialize pib updates to fix double-free

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Summary

CVECVE-2026-97599
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:11 UTC
Updated2026-09-25 11:17:11 UTC
DescriptionIn 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().

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.088270000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f25da51fdc381ca2863248c7060b3662632f0872 9973b3a67a7592a780ea12b08334539a900deec1 git Not specified
CNA Linux Linux affected f25da51fdc381ca2863248c7060b3662632f0872 d3b8f264ce09573aededd0a97dc41c8147797d8f git Not specified
CNA Linux Linux affected f25da51fdc381ca2863248c7060b3662632f0872 db6442deecb1f13aeaf4f9d77746ea7555630fb3 git Not specified
CNA Linux Linux affected f25da51fdc381ca2863248c7060b3662632f0872 979d5b8de8ed4e1f997aef12da5694b99be7b871 git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/979d5b8de8ed4e1f997aef12da5694b99be7b871 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d3b8f264ce09573aededd0a97dc41c8147797d8f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db6442deecb1f13aeaf4f9d77746ea7555630fb3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9973b3a67a7592a780ea12b08334539a900deec1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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