{"id":"CVE-2026-99027","title":"net: team: stop reusing skb after queue override","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: team: stop reusing skb after queue override\n\nA nonzero dev_queue_xmit() result does not return ownership of the skb.\nWhen an override port's qdisc drops it, the qu…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < b21f20320fa2f3c683e3334d70de6bfd172e544a","Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < 07a48cfceb3d0555710a9acb87c949500a7b4523","Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < 0c0568c9d35c47dc8e3ef6705d4c35a02bd88c4e","Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < bed63353341d2d44cbad034001dd382cfe3a3892","Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < b7454f1940c5e6d92e753853c476a769e452f30a","Linux 3.7"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T12:21:14.896Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99027","references":[{"url":"https://git.kernel.org/stable/c/b21f20320fa2f3c683e3334d70de6bfd172e544a"},{"url":"https://git.kernel.org/stable/c/07a48cfceb3d0555710a9acb87c949500a7b4523"},{"url":"https://git.kernel.org/stable/c/0c0568c9d35c47dc8e3ef6705d4c35a02bd88c4e"},{"url":"https://git.kernel.org/stable/c/bed63353341d2d44cbad034001dd382cfe3a3892"},{"url":"https://git.kernel.org/stable/c/b7454f1940c5e6d92e753853c476a769e452f30a"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.532Z","slug":"CVE-2026-99027","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: team: stop reusing skb after queue override\n\nA nonzero dev_queue_xmit() result does not return ownership of the skb.\nWhen an override port's qdisc drops it, the queue override helper used to\ntry another port or the mode transmit op with the freed skb.\n\nReturn the handoff decision separately from transmit success. Select only\nthe first override port under RCU and stop after handing it the skb,\nregardless of the lower transmit result. Keep the existing success and\ndrop accounting.\n\n  BUG: KASAN: slab-use-after-free in sk_skb_reason_drop\n  Write of size 4 by task poc/5040\n  sk_skb_reason_drop (net/core/skbuff.c:1240)\n  dev_kfree_skb_any_reason (net/core/dev.c:3470)\n  ab_transmit (drivers/net/team/team_mode_activebackup.c:49)\n  team_xmit (drivers/net/team/team_core.c:1849)\n  __dev_direct_xmit (net/core/dev.c:4934)\n  Freed by task 5040:\n  __tcf_kfree_skb_list (net/sched/sch_generic.c:43)\n  __dev_queue_xmit (net/core/dev.c:4831)\n  team_xmit (drivers/net/team/team_core.c:1846)\n  Kernel panic - not syncing: KASAN: panic_on_warn set ...\n\n## Affected\n\n- `Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < b21f20320fa2f3c683e3334d70de6bfd172e544a`\n- `Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < 07a48cfceb3d0555710a9acb87c949500a7b4523`\n- `Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < 0c0568c9d35c47dc8e3ef6705d4c35a02bd88c4e`\n- `Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < bed63353341d2d44cbad034001dd382cfe3a3892`\n- `Linux >= 8ff5105a2b9dd0ba596719b165c1827d101e5f1a < b7454f1940c5e6d92e753853c476a769e452f30a`\n- `Linux 3.7`\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":[]}