CVE-2026-99282

Что произошло

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_teql: fix use-after-free on lower qdisc drop The issue: teql_master_xmit() tests the slave's ndo_start_xmit() return value against NETDEV_TX_OK alone. A slave that consumes the skb but returns an error code (rc dev and calls __skb_pull() on it. A VLAN slave returns the result of dev_queue_xmit() from its ndo_start_xmit() (propagated since cbbef5e18307), and when the lower qdisc drops the packet that value is NET_XMIT_DROP after the skb has been freed, giving a use-after-free in teql_master_xmit(). The Fix: test for consumption with dev_xmit_complete(), which accepts NETDEV_TX_OK and every rc < NET_XMIT_MASK, matching other callers that need to distinguish consumed results from busy. Only NETDEV_TX_OK keeps the packet counted in tx_packets/tx_bytes and advances the slave; a consumed result that is neither a success nor NET_XMIT_CN ends the attempt and is charged to tx_dropped, so lower-qdisc drops are no longer reported as good transmits. NET_XMIT_CN is counted like success because it can accompany acceptance of the current packet: pfifo_head_drop drops the old head, enqueues the current skb and returns NET_XMIT_CN. Conditions to recreate the bug: With CONFIG_NET_SCH_TEQL, CONFIG_VLAN_8021Q and CONFIG_DUMMY enabled, add lkrdummy0 (dummy) and lkrvlan0 (VLAN id 37 on lkrdummy0); set a pfifo limit 0 root on lkrdummy0 and a teql0 root on lkrvlan0; bring teql0 up with an address and send one UDP packet to it. The VLAN xmit returns NET_XMIT_DROP from the lower qdisc while holding a freed skb.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "572a9d7b6fc7f20f573664063324c086be310c42",
  "lessThan": "fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "572a9d7b6fc7f20f573664063324c086be310c42",
  "lessThan": "2702ae318630787c640ec0d0403ffd9d95c43e9e",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "572a9d7b6fc7f20f573664063324c086be310c42",
  "lessThan": "782d6bb8f9b8e9d8591181662222bf74cd3ecf79",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "2.6.33"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "2.6.33",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.18.61",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.3.2",
  "versionType": "semver",
  "lessThanOrEqual": "7.3.*"
}

{
  "status": "unaffected",
  "version": "7.4-rc1",
  "versionType": "original_commit_for_fix",
  "lessThanOrEqual": "*"
}

CVSS: оценки и векторы

Оценка CVSS отсутствует.

Источники и ссылки

{
  "cwes": [],
  "title": {
    "source": "cve",
    "received_at": "2026-11-07T14:20:15.548930+00:00"
  },
  "scores": [],
  "status": {
    "source": "cve",
    "received_at": "2026-11-07T14:20:15.548930+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-11-07T14:20:15.548930+00:00"
  },
  "solutions": [],
  "references": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-11-07T14:20:15.548930+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены07.11.2026, 19:00
2. Опубликована07.11.2026, 17:20

Личная заметка и статус

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