Answer in brief
CVE-2026-98420 records a Unknown severity vulnerability in ksmbd: follow SMB2 session expiration semantics. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ea174a91893956450510945a0c5d1a10b5323656 <c99ea7855124ca1428a1e59c2b4590aaef34eacf || >=ea174a91893956450510945a0c5d1a10b5323656 <d7fd1f98607f2cd358e583f9548bdf0173090a86 || a6a9601ba995d0fec635324cb9fd8d14f9bea14e || 1fc8a2b14ef5223f8e0b95faba2ee0a6e4d0f99d || 750a2d772e9d9ff377fd32e3b6797bf2cd847a7a || 6775ee7ef4b37c521aa4cf3730f54554c4875542 || >=5.15.145 <5.16 || >=6.1.29 <6.2 || >=6.2.16 <6.3 || >=6.3.2 <6.4 | c99ea7855124ca1428a1e59c2b4590aaef34eacf, d7fd1f98607f2cd358e583f9548bdf0173090a86, 5.16, 6.2, 6.3, 6.4 |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Oct 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 14, 2026
In the Linux kernel, the following vulnerability has been resolved: ksmbd: follow SMB2 session expiration semantics ksmbd_session_register() destroys valid sessions after ten seconds of inactivity whenever a client starts another SessionSetup exchange. This confuses Session.IdleTime with Session.ExpirationTime. Windows can create additional authenticated sessions on an existing connection, so deleting the older session invalidates its tree connects and makes mapped drives fail with STATUS_NETWORK_NAME_DELETED. The session expiration rules require the server to change a valid session to expired only after its credential expiration time passes. A valid or expired session otherwise keeps its connection from being scavenged. Connections that have not negotiated a dialect, have no sessions, or have only InProgress sessions are disconnected after an implementation-specific timeout. Use the Windows-compatible 45 second value and run the expiration check periodically for both TCP and SMB Direct. Keep zero as an infinite credential expiration time, and count each Valid-to-Expired transition. Set expired sessions to InProgress when they reauthenticate. If authentication fails, remove the session from the global and per-connection tables immediately, including SMB3 multichannel connections. Retain protection against abandoned SessionId-zero exchanges by allowing only one InProgress authentication per connection. Additional exchanges fail with STATUS_INSUFFICIENT_RESOURCES, and stale InProgress sessions are reaped after the same 45 second setup timeout. This bounds the original unauthenticated memory-exhaustion path without evicting established sessions.
Quoted source text, attributed separately from HOL analysis.