{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98331", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.341Z", "datePublished": "2026-10-06T08:46:23.481Z", "dateUpdated": "2026-10-19T09:17:41.508Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:17:41.508Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: unlist vifs when their netdev is unregistered\n\nmac80211 only removes vifs from the local->interfaces list when\nan interface is removed via ieee80211_if_remove(), before it\nunregisters the netdev. However, it's possible for a netdev to\nbe unregistered without going through that: When the netns that\nholds the wiphy is destroyed, the wiphy is supposed to move to\nthe init_ns, but that can run into allocation failures.\n\nThen, mac80211 has an interface listed that doesn't exist, and\nwill eventually hit\n\n BUG: failure at net/wireless/core.h:141/wiphy_to_rdev()!\n ...\n _cfg80211_unregister_wdev+0x24/0x36a [cfg80211]\n cfg80211_unregister_wdev+0x15/0x1d [cfg80211]\n ieee80211_remove_interfaces+0x1ff/0x257 [mac80211]\n ieee80211_unregister_hw+0x73/0x1d1 [mac80211]\n mac80211_hwsim_del_radio+0x114/0x166 [mac80211_hwsim]\n\nRemove the interface from the list in ->ndo_uninit if it's still\naround to avoid this." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The trigger is local: tearing down a netns that holds a mac80211 wiphy runs cfg80211_pernet_exit()->cfg80211_switch_netns(). When dev_change_net_namespace() fails there, default_device_exit_batch() unregisters the netdev while ieee80211_uninit() leaves its sdata on local->interfaces. No WiFi frame supplies the failing state.\nAC:H - It needs a wiphy already moved into an attacker-controlled netns (an admin step), plus a failed move back. The attacker can force the failure: an altname on the wlan netdev that clashes with an init_net name makes __dev_change_net_namespace() return -EEXIST, because cfg80211 doesn't strip altnames. The rare alternative is an allocation failure.\nPR:L - With a phy delegated to a container, root in that user-namespace-owned netns, which is unprivileged on the host, can add the altname via RTM_NEWLINKPROP and destroy the netns. Moving a phy out of init_net yourself needs init-ns CAP_NET_ADMIN, and hwsim radios made in a user netns are deleted by hwsim_exit_net() before cfg80211 runs.\nUI:N - The container root adds the altname and exits the namespace on their own. No other user has to do anything.\nS:U - This is memory corruption in the host kernel's mac80211 interface list. Exploiting it is ordinary kernel privilege escalation within the same kernel authority; no hypervisor or IOMMU boundary is involved.\nC:H - The netdev is freed via needs_free_netdev, but its sdata stays on local->interfaces. Every received frame then makes __ieee80211_rx_handle_packet() read the freed sdata through list_for_each_entry_rcu(), which gives a use-after-free read of an object an attacker can reallocate.\nI:H - Later removal of a neighbouring interface (list_del_rcu) and ieee80211_remove_interfaces() write into and dereference the stale sdata. That is a use-after-free write that heap reallocation could turn into memory corruption.\nA:H - The dangling entry crashes the kernel: the commit shows a BUG in wiphy_to_rdev() reached from ieee80211_remove_interfaces() during ieee80211_unregister_hw(), and frame RX can touch freed memory." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mac80211/iface.c" ], "versions": [ { "version": "463d018323851a608eef52a9427b0585005c647f", "lessThan": "a22c02863439993095acd0c3db97fa53cd515f4f", "status": "affected", "versionType": "git" }, { "version": "463d018323851a608eef52a9427b0585005c647f", "lessThan": "20a56e96a6f7b4dfbd13f8732fd2673409fc7ba0", "status": "affected", "versionType": "git" }, { "version": "463d018323851a608eef52a9427b0585005c647f", "lessThan": "b735ad1a9aca6080192c1316cf2706e5e1318762", "status": "affected", "versionType": "git" }, { "version": "463d018323851a608eef52a9427b0585005c647f", "lessThan": "d45bf731ec7085d2cc2c5d179d3b3b6c743d4fb1", "status": "affected", "versionType": "git" }, { "version": "463d018323851a608eef52a9427b0585005c647f", "lessThan": "821bab0456dfca12acef6df702c8f2477d313227", "status": "affected", "versionType": "git" }, { "version": "463d018323851a608eef52a9427b0585005c647f", "lessThan": "eee2efd82867b623982ac51925b5a1812a74c50d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mac80211/iface.c" ], "versions": [ { "version": "2.6.32", "status": "affected" }, { "version": "0", "lessThan": "2.6.32", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.18.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "7.2.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a22c02863439993095acd0c3db97fa53cd515f4f" }, { "url": "https://git.kernel.org/stable/c/20a56e96a6f7b4dfbd13f8732fd2673409fc7ba0" }, { "url": "https://git.kernel.org/stable/c/b735ad1a9aca6080192c1316cf2706e5e1318762" }, { "url": "https://git.kernel.org/stable/c/d45bf731ec7085d2cc2c5d179d3b3b6c743d4fb1" }, { "url": "https://git.kernel.org/stable/c/821bab0456dfca12acef6df702c8f2477d313227" }, { "url": "https://git.kernel.org/stable/c/eee2efd82867b623982ac51925b5a1812a74c50d" } ], "title": "wifi: mac80211: unlist vifs when their netdev is unregistered", "x_generator": { "engine": "bippy-1.2.0" } } } }