CVE-2026-99282

net/sched: sch_teql: fix use-after-free on lower qdisc drop

Products / packages Linux

Published 07/11/2026, 14:08:47 UTC

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 20:55:32 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

4 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

572a9d7b6fc7f20f573664063324c086be310c42 → before 8d5f768780e26cb82c389219ae7fdb1cd7255421

git versions

572a9d7b6fc7f20f573664063324c086be310c42 → before fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde

git versions

572a9d7b6fc7f20f573664063324c086be310c42 → before 2702ae318630787c640ec0d0403ffd9d95c43e9e

git versions

572a9d7b6fc7f20f573664063324c086be310c42 → before 782d6bb8f9b8e9d8591181662222bf74cd3ecf79

git versions

Other versions: unaffected

Linux · Linux

Linux

6 ranges

Linux version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

2.6.33

unaffected

0 → before 2.6.33

semver versions

6.12.117 → through 6.12.*

semver versions

6.18.61 → through 6.18.*

semver versions

7.3.2 → through 7.3.*

semver versions

7.4-rc1 → through *

original_commit_for_fix versions

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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 < NET_XMIT_MASK, e.g. NET_XMIT_DROP) is treated as if the skb were still owned, so the loop restores skb->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.

References

4 sources

git.kernel.org/stable/c/8d5f768780e26cb82c389219ae7fdb1cd7255421

Source referenceLinux

git.kernel.org/stable/c/fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde

Source referenceLinux

git.kernel.org/stable/c/2702ae318630787c640ec0d0403ffd9d95c43e9e

Source referenceLinux

git.kernel.org/stable/c/782d6bb8f9b8e9d8591181662222bf74cd3ecf79

Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance · not supplied

Weakness classification · not supplied

Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-99282

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.33

After:

Through (inclusive):

Before: 6.12.117

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.33

After:

Through (inclusive):

Before: 6.18.61

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.33

After:

Through (inclusive):

Before: 7.3.2

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.33

After:

Through (inclusive):

Before: 7.4-rc1

Applicability preview

[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.33",
            "versionEndExcluding": "6.12.117"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.33",
            "versionEndExcluding": "6.18.61"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.33",
            "versionEndExcluding": "7.3.2"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.33",
            "versionEndExcluding": "7.4-rc1"
          }
        ]
      }
    ]
  }
]

Contributing organizations · 1

Linux

Assigning organization

2026-11-10

Timeline

All times UTC

7 Nov 2026, 14:08
Advisory published
Publication date supplied by the source.
10 Nov 2026, 18:15
Source updated
Latest modification date supplied by the source.
10 Nov 2026, 18:25
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-992822026-11-10

Observed 2026-11-10T18:25:54.844Z · upstream updated 2026-11-10T18:15:29.554Z

Product or version evidence changed

before

[
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "572a9d7b6fc7f20f573664063324c086be310c42",
        "status": "affected",
        "lessThan": "fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde",
        "versionType": "git"
      },
      {
        "version": "572a9d7b6fc7f20f573664063324c086be310c42",
        "status": "affected",
        "lessThan": "2702ae318630787c640ec0d0403ffd9d95c43e9e",
        "versionType": "git"
      },
      {
        "version": "572a9d7b6fc7f20f573664063324c086be310c42",
        "status": "affected",
        "lessThan": "782d6bb8f9b8e9d8591181662222bf74cd3ecf79",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99282"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "2.6.33",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "2.6.33",
        "versionType": "semver"
      },
      {
        "version": "6.18.61",
        "status": "unaffected",
        "lessThanOrEqual": "6.18.*",
        "versionType": "semver"
      },
      {
        "version": "7.3.2",
        "status": "unaffected",
        "lessThanOrEqual": "7.3.*",
        "versionType": "semver"
      },
      {
        "version": "7.4-rc1",
        "status": "unaffected",
        "lessThanOrEqual": "*",
        "versionType": "original_commit_for_fix"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99282"
  }
]

after

[
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "572a9d7b6fc7f20f573664063324c086be310c42",
        "status": "affected",
        "lessThan": "8d5f768780e26cb82c389219ae7fdb1cd7255421",
        "versionType": "git"
      },
      {
        "version": "572a9d7b6fc7f20f573664063324c086be310c42",
        "status": "affected",
        "lessThan": "fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde",
        "versionType": "git"
      },
      {
        "version": "572a9d7b6fc7f20f573664063324c086be310c42",
        "status": "affected",
        "lessThan": "2702ae318630787c640ec0d0403ffd9d95c43e9e",
        "versionType": "git"
      },
      {
        "version": "572a9d7b6fc7f20f573664063324c086be310c42",
        "status": "affected",
        "lessThan": "782d6bb8f9b8e9d8591181662222bf74cd3ecf79",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99282"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "2.6.33",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "2.6.33",
        "versionType": "semver"
      },
      {
        "version": "6.12.117",
        "status": "unaffected",
        "lessThanOrEqual": "6.12.*",
        "versionType": "semver"
      },
      {
        "version": "6.18.61",
        "status": "unaffected",
        "lessThanOrEqual": "6.18.*",
        "versionType": "semver"
      },
      {
        "version": "7.3.2",
        "status": "unaffected",
        "lessThanOrEqual": "7.3.*",
        "versionType": "semver"
      },
      {
        "version": "7.4-rc1",
        "status": "unaffected",
        "lessThanOrEqual": "*",
        "versionType": "original_commit_for_fix"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99282"
  }
]

References changed

before

[
  "https://git.kernel.org/stable/c/fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde",
  "https://git.kernel.org/stable/c/2702ae318630787c640ec0d0403ffd9d95c43e9e",
  "https://git.kernel.org/stable/c/782d6bb8f9b8e9d8591181662222bf74cd3ecf79"
]

after

[
  "https://git.kernel.org/stable/c/8d5f768780e26cb82c389219ae7fdb1cd7255421",
  "https://git.kernel.org/stable/c/fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cde",
  "https://git.kernel.org/stable/c/2702ae318630787c640ec0d0403ffd9d95c43e9e",
  "https://git.kernel.org/stable/c/782d6bb8f9b8e9d8591181662222bf74cd3ecf79"
]

Environment requirements changed

before

[
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.33",
                "versionEndExcluding": "6.18.61"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.33",
                "versionEndExcluding": "7.3.2"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.33",
                "versionEndExcluding": "7.4-rc1"
              }
            ]
          }
        ]
      }
    ]
  }
]

after

[
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.33",
                "versionEndExcluding": "6.12.117"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.33",
                "versionEndExcluding": "6.18.61"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.33",
                "versionEndExcluding": "7.3.2"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.33",
                "versionEndExcluding": "7.4-rc1"
              }
            ]
          }
        ]
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. No numeric assessment supplied.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-99282

Enrichment coverage

NVDAvailable

Checked 07/11/2026, 14:20:31 UTC

GHSANo result

Checked 07/11/2026, 14:20:31 UTC

EUVDNo result

Checked 07/11/2026, 14:20:31 UTC

EPSSNo result

Checked 07/11/2026, 14:20:31 UTC

Additional source evidence

NVD · CVE-2026-99282Checked 07/11/2026, 14:20:31 UTC

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

net/sched: sch_teql: fix use-after-free on lower qdisc drop

Severity and exploitation

What this means

Attack conditions

Affected versions

Linux

affected

unaffected

unknown

Linux

affected

unaffected

unknown

What to do

Public exploit evidence

Original source description

References

Inside the record

Evidence available

Original records

Environment requirements

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed