Security readout for executives and security teams
Plain-English summary
CVE-2024-56642 is a Linux kernel use-after-free in TIPC UDP bearer cleanup. A local, low-privilege context could potentially trigger memory corruption with high confidentiality, integrity, and availability impact. No source in the bundle shows active exploitation.
Executive priority
Treat as a high-priority kernel maintenance item, not an emergency internet-exposed incident. Patch affected Linux fleets through normal expedited kernel update channels, prioritizing shared systems and hosts with untrusted local workloads.
Technical view
The bug is in net/tipc/udp_media.c cleanup_bearer(). Workqueue accounting decremented before the UDP kernel socket was released, allowing network namespace cleanup to proceed and producing a use-after-free. The fix moves the decrement until after socket release.
Likely exposure
Exposure is limited to affected Linux kernels, with relevance highest where TIPC UDP bearer functionality is present or used. The CVSS vector is local, low privilege, no user interaction, so internet-facing remote exposure is not indicated by the supplied sources.
Exploitation context
The issue was reported by syzkaller/KMSAN without a reproducer in the source text. CISA KEV status is false in the bundle, and no cited source reports in-the-wild exploitation.
Researcher notes
The public detail identifies a race/order bug in asynchronous TIPC UDP bearer cleanup. Evidence supports memory safety impact, but the bundle does not include a reproducer, exploit path, or product-specific mitigations beyond stable kernel fixes and Debian advisories.
Mitigation direction
- Apply kernel or distribution updates containing the referenced stable fixes.
- Review Debian LTS advisories if running affected Debian LTS kernels.
- Prioritize systems allowing untrusted local users or workloads.
- Check vendor guidance before relying on configuration-only mitigations.
Validation and detection
- Inventory Linux kernel versions across hosts and images.
- Confirm whether deployed kernels include the referenced stable commits.
- Check whether TIPC UDP bearer functionality is enabled or required.
- Verify vendor advisory status for each distribution release.
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-2024-56642 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/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
1 official scoreWe 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: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
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/4e69457f9dfae67435f3ccf29008768eae860415CVE reference, Linux
- https://git.kernel.org/stable/c/650ee9a22d7a2de8999fac2d45983597a0c22359CVE reference, Linux
- https://git.kernel.org/stable/c/d2a4894f238551eae178904e7f45af87577074fdCVE reference, Linux
- https://git.kernel.org/stable/c/d62d5180c036eeac09f80660edc7a602b369125fCVE reference, Linux
- https://git.kernel.org/stable/c/d00d4470bf8c4282617a3a10e76b20a9c7e4cffaCVE reference, Linux
- https://git.kernel.org/stable/c/e48b211c4c59062cb6dd6c2c37c51a7cc235a464CVE reference, Linux
- https://git.kernel.org/stable/c/6a2fa13312e51a621f652d522d7e2df7066330b6CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.htmlCVE reference, CVE
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.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.