{"id":"CVE-2026-98810","title":"wifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue()\n\nieee80211_monitor_select_queue() validates the skb length using skb->len\nbefore derefer…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 9b8a74e3482f9fc077a88c13fa0ceca8feb0b772 < 63e7064b4c1c4b540bf2f0cba47384f92ab95307","Linux >= 9b8a74e3482f9fc077a88c13fa0ceca8feb0b772 < 6f63e919fe1e335b8abcb3a28bfd4804a98d875a","Linux 2.6.24"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:48:56.733Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98810","references":[{"url":"https://git.kernel.org/stable/c/63e7064b4c1c4b540bf2f0cba47384f92ab95307"},{"url":"https://git.kernel.org/stable/c/6f63e919fe1e335b8abcb3a28bfd4804a98d875a"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.479Z","slug":"CVE-2026-98810","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue()\n\nieee80211_monitor_select_queue() validates the skb length using skb->len\nbefore dereferencing pointers into skb->data to access the 802.11 header.\nHowever, skb->len includes data in both the linear head buffer and\nnon-linear fragments/pages. When AF_PACKET sends a packet large enough to\nbecome non-linear, the 802.11 header at skb->data + len_rthdr may extend\npast the linear head buffer even though skb->len appears sufficient.\n\nThis leads to a slab-out-of-bounds read when accessing hdr->frame_control,\nas the kernel reads beyond the allocated skb head buffer:\n\n  BUG: KASAN: slab-out-of-bounds in ieee80211_monitor_select_queue+0x1ed/0x220\n\nsyzbot has hit the same issues.\n\nFix this by checking skb_headlen(skb) (which gives the length of the\nlinear data region) instead of skb->len before dereferencing skb->data\npointers. This ensures the required bytes are actually present in the\nlinear portion of the skb.\n\nApply the same fix to ieee80211_validate_radiotap_len() which has the\nsame class of bug: it uses skb->len to validate accesses to skb->data,\nand to the corresponding checks in ieee80211_monitor_start_xmit(): for\ndrivers advertising NETIF_F_SG the skb is not linearized before\nndo_start_xmit, so the 802.11 header can be read past the linear\nbuffer there as well.\n\n## Affected\n\n- `Linux >= 9b8a74e3482f9fc077a88c13fa0ceca8feb0b772 < 63e7064b4c1c4b540bf2f0cba47384f92ab95307`\n- `Linux >= 9b8a74e3482f9fc077a88c13fa0ceca8feb0b772 < 6f63e919fe1e335b8abcb3a28bfd4804a98d875a`\n- `Linux 2.6.24`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}