{"id":"CVE-2026-97599","state":"PUBLISHED","title":"ieee802154: hwsim: serialize pib updates to fix double-free","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: hwsim: serialize pib updates to fix double-free\n\nhwsim_update_pib() does an unserialized read-swap-free of phy->pib:\n\n\tpib_old = rtnl_dereference(phy->pib);\n\t...\n\trcu_assign_pointer(phy->pib, pib);\n\tkfree_rcu(pib_old, rcu);\n\nIt assumes the RTNL is held, but ->set_channel is not always called\nunder it: the mac802154 scan worker changes channels via\ndrv_set_channel() without the RTNL. Such an update can race an\nRTNL-held one on the same phy; both read the same pib_old and both\nkfree_rcu() it, double-freeing the object. With SLUB percpu sheaves\nbatching kfree_rcu(), this surfaces as a KASAN invalid-free in\nrcu_free_sheaf().\n\nstruct hwsim_phy has no lock for pib. Add one and make the swap atomic\nwith rcu_replace_pointer() under it, dropping the misleading\nrtnl_dereference().","publishedAt":"2026-09-25T10:22:13.606Z","updatedAt":"2026-10-30T12:37:33.925Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"8f44a61f816581c35c1974c8c1a3b3c2c49e96be","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"e3b4681197aa026bd2d79358de5a3d62b76b04b9","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"9973b3a67a7592a780ea12b08334539a900deec1","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"d3b8f264ce09573aededd0a97dc41c8147797d8f","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"db6442deecb1f13aeaf4f9d77746ea7555630fb3","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"979d5b8de8ed4e1f997aef12da5694b99be7b871","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ieee802154/mac802154_hwsim.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ieee802154/mac802154_hwsim.c"]}],"references":["https://git.kernel.org/stable/c/8f44a61f816581c35c1974c8c1a3b3c2c49e96be","https://git.kernel.org/stable/c/e3b4681197aa026bd2d79358de5a3d62b76b04b9","https://git.kernel.org/stable/c/9973b3a67a7592a780ea12b08334539a900deec1","https://git.kernel.org/stable/c/d3b8f264ce09573aededd0a97dc41c8147797d8f","https://git.kernel.org/stable/c/db6442deecb1f13aeaf4f9d77746ea7555630fb3","https://git.kernel.org/stable/c/979d5b8de8ed4e1f997aef12da5694b99be7b871"],"weaknesses":[],"ingestedAt":"2026-10-30T12:56:04.490Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97599.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97599","state":"PUBLISHED","datePublished":"2026-09-25T10:22:13.606Z","dateUpdated":"2026-10-30T12:37:33.925Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-24T16:01:01.157Z"},"containers":{"cna":{"title":"ieee802154: hwsim: serialize pib updates to fix double-free","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: hwsim: serialize pib updates to fix double-free\n\nhwsim_update_pib() does an unserialized read-swap-free of phy->pib:\n\n\tpib_old = rtnl_dereference(phy->pib);\n\t...\n\trcu_assign_pointer(phy->pib, pib);\n\tkfree_rcu(pib_old, rcu);\n\nIt assumes the RTNL is held, but ->set_channel is not always called\nunder it: the mac802154 scan worker changes channels via\ndrv_set_channel() without the RTNL. Such an update can race an\nRTNL-held one on the same phy; both read the same pib_old and both\nkfree_rcu() it, double-freeing the object. With SLUB percpu sheaves\nbatching kfree_rcu(), this surfaces as a KASAN invalid-free in\nrcu_free_sheaf().\n\nstruct hwsim_phy has no lock for pib. Add one and make the swap atomic\nwith rcu_replace_pointer() under it, dropping the misleading\nrtnl_dereference()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"8f44a61f816581c35c1974c8c1a3b3c2c49e96be","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"e3b4681197aa026bd2d79358de5a3d62b76b04b9","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"9973b3a67a7592a780ea12b08334539a900deec1","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"d3b8f264ce09573aededd0a97dc41c8147797d8f","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"db6442deecb1f13aeaf4f9d77746ea7555630fb3","versionType":"git"},{"version":"f25da51fdc381ca2863248c7060b3662632f0872","status":"affected","lessThan":"979d5b8de8ed4e1f997aef12da5694b99be7b871","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ieee802154/mac802154_hwsim.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ieee802154/mac802154_hwsim.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8f44a61f816581c35c1974c8c1a3b3c2c49e96be"},{"url":"https://git.kernel.org/stable/c/e3b4681197aa026bd2d79358de5a3d62b76b04b9"},{"url":"https://git.kernel.org/stable/c/9973b3a67a7592a780ea12b08334539a900deec1"},{"url":"https://git.kernel.org/stable/c/d3b8f264ce09573aededd0a97dc41c8147797d8f"},{"url":"https://git.kernel.org/stable/c/db6442deecb1f13aeaf4f9d77746ea7555630fb3"},{"url":"https://git.kernel.org/stable/c/979d5b8de8ed4e1f997aef12da5694b99be7b871"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:37:33.925Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}