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In the Linux kernel, the following vulnerability has been resolved: net/sched: schteql: fix use-after-free on lower qdisc drop The issue:…

CVE-2026-99282

In the Linux kernel, the following vulnerability has been resolved: net/sched: schteql: fix use-after-free on lower qdisc drop The issue: teqlmasterxmit() tests the slave's ndostartxmit() return value against NETDEVTXOK alone. A slave that consumes the skb but returns an error code (rc dev and calls skbpull() on it. A VLAN slave returns the result of devqueuexmit() from its ndostartxmit() (propagated since cbbef5e18307), and when the lower qdisc drops the packet that value is NETXMITDROP after the skb has been freed, giving a use-after-free in teqlmasterxmit(). The Fix: test for consumption with devxmitcomplete(), which accepts NETDEVTXOK and every rc < NETXMITMASK, matching other callers that need to distinguish consumed results from busy. Only NETDEVTXOK keeps the packet counted in txpackets/txbytes and advances the slave; a consumed result that is neither a success nor NETXMITCN ends the attempt and is charged to txdropped, so lower-qdisc drops are no longer reported as good transmits. NETXMITCN is counted like success because it can accompany acceptance of the current packet: pfifoheaddrop drops the old head, enqueues the current skb and returns NETXMITCN. Conditions to…

Assessment

CVSS
Not yet scored
Severity
Unscored
Known exploited
Not listed in CISA KEV
Exploit availability
Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published
7 November 2026
Last updated
7 November 2026
Affected
Linux · Linux
Assigner
Linux

At the source

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