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NVD / CVE Program· CNA Linux

CVE-2026-99282: net/sched: sch_teql: fix use-after-free on lower qdisc drop

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.15% (FIRST EPSS).
  • Fixed version: Linux Linux 2702ae318630787c640ec0d0403ffd9d95c43e9e, 782d6bb8f9b8e9d8591181662222bf74cd3ecf79, 8d5f768780e26cb82c389219ae7fdb1cd7255421.

Low priority for now. Upgrade to Linux Linux 2702ae318630787c640ec0d0403ffd9d95c43e9e, 782d6bb8f9b8e9d8591181662222bf74cd3ecf79, 8d5f768780e26cb82c389219ae7fdb1cd7255421 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Nov 7, 2026
Updated
Nov 10, 2026
EPSS
0.1% · 4th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

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Affected systems

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—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.33affected
    • 572a9d7b6fc7f20f573664063324c086be310c42 and later · before 8d5f768780e26cb82c389219ae7fdb1cd7255421affected · git
    • 572a9d7b6fc7f20f573664063324c086be310c42 and later · before fc55d92ae6a4b2e7d062cad6d4c67f6b061d9cdeaffected · git
    • 572a9d7b6fc7f20f573664063324c086be310c42 and later · before 2702ae318630787c640ec0d0403ffd9d95c43e9eaffected · git
    • 572a9d7b6fc7f20f573664063324c086be310c42 and later · before 782d6bb8f9b8e9d8591181662222bf74cd3ecf79affected · git
    • before 2.6.33not affected · semver
    • 6.12.117 and later · up to and including 6.12.*not affected · semver
    • 6.18.61 and later · up to and including 6.18.*not affected · semver
    • 7.3.2 and later · up to and including 7.3.*not affected · semver
    • 7.4-rc1 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99280Nov 7, 2026 · ksmbd: drain session procfs readers before dropping table references
    0Monitor
  • ← EarlierCVE-2026-99281Nov 7, 2026 · tun: Require CAP_NET_ADMIN to attach to an ownerless device
    31Monitor
  • Later →CVE-2026-99283Nov 7, 2026 · netfilter: conntrack: tcp: use UNACK timeout for non-closing RST packets
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2702ae318630787c640ec0d0403ffd9d95c43e9eVendor (CNA)
Linux Linux782d6bb8f9b8e9d8591181662222bf74cd3ecf79Vendor (CNA)
Linux Linux8d5f768780e26cb82c389219ae7fdb1cd7255421Vendor (CNA)
Linux Linuxfc55d92ae6a4b2e7d062cad6d4c67f6b061d9cdeVendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 11, 2026+4 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

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No commit or PR link among the references.

Credits

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

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Change log

  1. Fix✗ → ✓
  2. Exploit maturity— → none

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References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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