Security readout for executives and security teams
Plain-English summary
A race condition in the Linux kernel’s ksmbd SMB server can access freed memory while sessions are created and expired. The supplied assessment rates potential confidentiality, integrity, and availability impact as high, without authentication or user interaction. Systems not using ksmbd are less likely to reach the vulnerable path.
Executive priority
Prioritize urgent review of internet-facing or broadly reachable Linux SMB servers. Patch confirmed ksmbd deployments promptly. Systems without ksmbd exposure can be handled through normal vulnerability management after documenting why the vulnerable path is unreachable.
Technical view
CVE-2024-50286 is a CWE-416 slab use-after-free caused by concurrent ksmbd_smb2_session_create and ksmbd_expire_session operations. The correction adds the missing sessions_table_lock when sessions are added to or removed from the global session table. The supplied CVSS 3.1 score is 9.8.
Likely exposure
Exposure is most concerning where an affected Linux kernel runs ksmbd and accepts untrusted SMB connections. The supplied affected-version data names several kernel versions but does not provide sufficiently clear range boundaries for reliable inventory decisions. Confirm status through the applicable distribution or vendor advisory.
Exploitation context
The supplied record is not in KEV, and no provided source establishes active exploitation or a publicly weaponized exploit. The network-accessible, unauthenticated CVSS vector indicates serious theoretical reachability, but it does not by itself demonstrate practical exploitation.
Researcher notes
The source establishes a session-table locking defect and use-after-free, but does not document triggering reliability, crash evidence, code execution, or exploitation in the wild. Exact affected ranges should not be inferred from the flattened version list; use distribution package advisories and the cited stable commits.
Mitigation direction
- Install a vendor-supported kernel update containing the applicable stable fix.
- Check Linux distribution guidance for exact fixed package versions.
- Reduce untrusted network access to ksmbd until remediation is verified.
- Disable ksmbd where SMB server functionality is unnecessary, following vendor guidance.
Validation and detection
- Determine whether ksmbd is installed, loaded, enabled, or configured.
- Identify the running kernel and distribution package version.
- Compare that version with the distribution’s CVE advisory and fixed package.
- Confirm the installed kernel contains the applicable cited stable commit.
- Verify SMB exposure is limited to intended networks after remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2024-50286 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/f56446ba5378d19e31040b548a14ee9a8f1500eaCVE reference, Linux
- https://git.kernel.org/stable/c/e923503a56b3385b64ae492e3225e4623f560c5bCVE reference, Linux
- https://git.kernel.org/stable/c/e7a2ad2044377853cf8c59528dac808a08a99c72CVE reference, Linux
- https://git.kernel.org/stable/c/0a77715db22611df50b178374c51e2ba0d58866eCVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.htmlCVE reference, CVE
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.