{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde","status":"affected","version":"572a9d7b6fc7f20f573664063324c086be310c42","versionType":"git"},{"lessThan":"2702ae318630787c640ec0d0403ffd9d95c43e9e","status":"affected","version":"572a9d7b6fc7f20f573664063324c086be310c42","versionType":"git"},{"lessThan":"782d6bb8f9b8e9d8591181662222bf74cd3ecf79","status":"affected","version":"572a9d7b6fc7f20f573664063324c086be310c42","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"2.6.33"},{"lessThan":"2.6.33","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.61","versionType":"semver"},{"lessThanOrEqual":"7.3.*","status":"unaffected","version":"7.3.2","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.4-rc1","versionType":"original_commit_for_fix"}]}],"cveId":"CVE-2026-99282","cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_teql: fix use-after-free on lower qdisc drop\n\nThe issue: teql_master_xmit() tests the slave's ndo_start_xmit() return\nvalue against NETDEV_TX_OK alone. A slave that consumes the skb but\nreturns an error code (rc < NET_XMIT_MASK, e.g. NET_XMIT_DROP) is treated\nas if the skb were still owned, so the loop restores skb->dev and calls\n__skb_pull() on it. A VLAN slave returns the result of dev_queue_xmit()\nfrom its ndo_start_xmit() (propagated since cbbef5e18307), and when the\nlower qdisc drops the packet that value is NET_XMIT_DROP after the skb\nhas been freed, giving a use-after-free in teql_master_xmit().\n\nThe Fix: test for consumption with dev_xmit_complete(), which accepts\nNETDEV_TX_OK and every rc < NET_XMIT_MASK, matching other callers that\nneed to distinguish consumed results from busy. Only NETDEV_TX_OK keeps\nthe packet counted in tx_packets/tx_bytes and advances the slave; a\nconsumed result that is neither a success nor NET_XMIT_CN ends the\nattempt and is charged to tx_dropped, so lower-qdisc drops are no longer\nreported as good transmits. NET_XMIT_CN is counted like success because\nit can accompany acceptance of the current packet: pfifo_head_drop drops\nthe old head, enqueues the current skb and returns NET_XMIT_CN.\n\nConditions to recreate the bug:\nWith CONFIG_NET_SCH_TEQL,\nCONFIG_VLAN_8021Q and CONFIG_DUMMY enabled, add lkrdummy0 (dummy) and\nlkrvlan0 (VLAN id 37 on lkrdummy0); set a pfifo limit 0 root on lkrdummy0\nand a teql0 root on lkrvlan0; bring teql0 up with an address and send one\nUDP packet to it. The VLAN xmit returns NET_XMIT_DROP from the lower\nqdisc while holding a freed skb.","epss":null,"exploits":[],"kev":null,"metrics":[],"modifiedAt":1794060527978,"publishedAt":1794060527978,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/2702ae318630787c640ec0d0403ffd9d95c43e9e"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/782d6bb8f9b8e9d8591181662222bf74cd3ecf79"}],"remediation":[],"revision":"0d792b643feed6694463fc4f8808fa54c5dea6d11d5e0d06af7fcb206770e169","sources":[{"modifiedAt":1794060527978,"name":"CNA: Linux","retrievedAt":1794064162152,"url":"https://www.cve.org/CVERecord?id=CVE-2026-99282"}],"ssvc":null,"status":"published","title":"net/sched: sch_teql: fix use-after-free on lower qdisc drop","updatedAt":1794064162152}