CVE-2026-98449
In the Linux kernel, the following vulnerability has been resolved: smb: client: delete compound mids on send failure before unlock When sending a compound request fails, smb_send_rqst() kicks off a reconnect. compound_send_recv() still has those mids on pending_mid_q, but it unlocks the server without removing them first. During reconnect, cifs_abort_connection() walks pending_mid_q and runs each mid callback. With no response yet, those callbacks return credits and drop in_flight. Then compound_send_recv()'s send-error path returns the same credits again. in_flight ends up decremented twice and smb2_add_credits() WARNs. syzbot hits this during SMB2_negotiate when the socket send fails. cifs_call_async() already calls delete_mid() before unlock on send failure. Do the same for compound chains and set cancelled_mid[] so the out: path does not delete them again.
Affected versions
Linux kernel versions
4.20.11,
5.0
and later are affected. Fixed in
7.2.9,
7.3
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-98449?
CVE-2026-98449 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.20.11 onward and has been patched in 7.2.9 and 7.3. CVE-2026-98449 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98449?
Yes. CVE-2026-98449 has been patched. Fixed versions include 7.2.9 and 7.3. If you are running Linux kernel 4.20.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98449 actively exploited?
No. CVE-2026-98449 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.