CVE-2023-32252: Session null pointer dereference denial-of-service vulnerability
Telemetry drift only. No threshold crossed and no authority ruling changed.
CVE record, CISA KEV and EPSS as of 2026-10-18.
CVEs like this one computed, by meaning
What to do now held facts and links
- Upgrade to 6.4-rc1 or later CVE record
- Record your decision, dated and frozen with today's evidence: patch by a date · mitigated by a compensating control · deferred · accepted the risk · not affected
- Check your version against the ranges this record publishes.
What it is stated by the CNA
A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the handling of SMB2_LOGOFF commands. The issue results from the lack of proper validation of a pointer prior to accessing it. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.
- weakness
- CWE-476 NULL Pointer Dereference
- affected
- n/a kernel; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Fedora
- published ranges
- linux kernel >= 5.15 < 5.15.145; linux kernel >= 5.16 < 6.1.29; linux kernel >= 6.2 < 6.2.16; linux kernel >= 6.3 < 6.3.2
- fixed in
- 6.4-rc1
- severity
- 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- assigned by
- redhat
- published
- 2023-07-24
check us access.redhat.com bugzilla.redhat.com security.netapp.com zerodayinitiative.com
Exploit code held, dated
- exploit code
- None held in the PoC-in-GitHub feed. A public repository changes this brief.
What moved held, dated
| date | EPSS | event |
|---|---|---|
| 25 Jul 2023 | 0.00048 | |
| 3 Aug 2023 | 0.00235 | |
| 25 Nov 2023 | 0.00518 | |
| 5 Dec 2023 | 0.00552 | |
| 17 Mar 2025 | 0.0729 | scoring model v2025.03.14 |
| 29 Mar 2025 | 0.12283 | crossed 0.10 |
| 30 Mar 2025 | 0.0729 | crossed 0.10 |
| 18 Nov 2025 | 0.0729 | |
| 21 Nov 2025 | 0.00133 | |
| 20 May 2026 | 0.00142 | |
| 15 Jun 2026 | 0.0406 | scoring model v2026.06.15 |
23 observations held. A step marked with a scoring model moved because the measurement was replaced, not because the vulnerability changed.
Outside the record researched, cited
This section reads the record's references and adds cited findings from outside it. It needs an account. Everything above is held facts and is complete without it.
What would change this brief held, dated
- CISA KEV
- Not listed in the catalogue we hold. A listing changes this brief.
- exploit probability
- 0.04 on 2026-06-15 (FIRST's EPSS, a probability and not evidence of exploitation). Next band line: 10% (0.10). Crossing a line changes this brief.
- fix
- Held: 6.4-rc1. A newer fix from the CNA or OSV changes this brief.
How to check this
Every value above is held with two dates: when it was true upstream (as_of) and when we recorded it (tx_from). Re-derive the exploit probability as it stood on any date:
SELECT value, source, source_version, as_of, tx_from
FROM volatile_valid_as_of('CVE-2023-32252', '2026-10-30T23:59:59.999999Z', now());