Security readout for executives and security teams
Plain-English summary
A flaw in Linux IPv4 multicast routing can cause a kernel panic while forwarding multicast traffic, making an affected system unavailable. The supplied CVSS score is 7.5 (High) because the stated impact is denial of service, without confidentiality or integrity loss.
Executive priority
Treat as a high-priority availability issue for multicast-enabled network infrastructure. Patch exposed routers and appliances promptly, but avoid assuming every Linux host is vulnerable. Business urgency depends on multicast-routing use, traffic reachability, redundancy, and the operational impact of a kernel crash.
Technical view
The Linux ipmr subsystem can dereference a null pointer in ip_mr_forward when multicast forwarding state is updated, producing a kernel oops or panic. The supplied vector rates the issue network-accessible, low complexity, unauthenticated, and availability-only. Practical triggering conditions are not fully documented in the bundle.
Likely exposure
Prioritize Linux routers, gateways, appliances, and hosts using IPv4 multicast routing. Systems without multicast forwarding are less likely to encounter the vulnerable path. The supplied version data is ambiguous and does not establish complete affected ranges, so distribution-specific kernel advisories are necessary.
Exploitation context
The supplied record does not show active exploitation, and CVE-2024-26626 is not marked as CISA KEV. A kernel panic could support remote denial of service where multicast routing is enabled and traffic reaches the vulnerable forwarding path. No evidence here supports code execution or data compromise.
Researcher notes
The trace places the fault in ip_mr_forward during multicast forwarding while an MFC entry is added through routing socket operations. Four stable-kernel commits are cited. The bundle does not provide complete introduction ranges, proof-of-concept details, or exploitation telemetry; affected-version conclusions should therefore be verified against vendor backports.
Mitigation direction
- Install a vendor-supported kernel containing the applicable upstream stable fix.
- Check distribution advisories to map packaged kernel versions to the cited fix commits.
- If patching is delayed, restrict unnecessary multicast traffic and disable unused multicast-routing functionality.
- Schedule prompt reboots where required to activate the updated kernel.
Validation and detection
- Inventory running kernel versions on systems performing IPv4 multicast routing.
- Confirm packaged kernels include the appropriate cited stable commit or vendor backport.
- Verify the updated kernel is running after maintenance or reboot.
- Review kernel logs for ip_mr_forward null dereferences, oops events, or unexpected panics.
- Test legitimate multicast forwarding after remediation in a controlled environment.
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
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CVE-2024-26626 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6LinuxVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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/d2f1b7fe74afd66298dbb3c7b39e7b62e4df1724CVE reference, Linux
- https://git.kernel.org/stable/c/dcaafdba6c6162bb49f1192850bc3bbc3707738cCVE reference, Linux
- https://git.kernel.org/stable/c/2e8c9ae40adda2be1ba41c05fd3cd1e61cce3207CVE reference, Linux
- https://git.kernel.org/stable/c/e622502c310f1069fd9f41cd38210553115f610aCVE reference, Linux
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.