Security readout for executives and security teams
Plain-English summary
This Linux kernel flaw can cause a system crash during IPv6 module initialization failure cleanup. It affects availability, not confidentiality or integrity. The source bundle rates it medium with CVSS 5.5 because exploitation is local, needs privileges, and results in kernel panic rather than data compromise.
Executive priority
Treat this as a routine but important availability patch. It is not currently evidenced as internet-exploitable or actively exploited, but kernel panics can disrupt shared servers and critical workloads. Patch through normal kernel maintenance, with higher priority for multi-user Linux environments.
Technical view
A null pointer dereference occurs in neigh_table_clear() through neigh_ifdown(tbl, NULL), where dev_net(NULL) is reached while cleaning up after a failed IPv6 initialization path. The kernel fix changes cleanup behavior so pneigh_queue_purge() receives NULL when dev is NULL.
Likely exposure
Exposure is limited to Linux systems running affected kernel versions or unpatched backports, especially where local users or processes can trigger relevant IPv6 module initialization paths. Remote network-only exposure is not supported by the source bundle.
Exploitation context
The bundle does not show active exploitation, and KEV is false. Available evidence describes a local crash scenario observed through insmod and a failed IPv6 initialization path. No public weaponization details are included in the provided sources.
Researcher notes
Evidence is strongest for a null pointer dereference during IPv6 cleanup after initialization failure. The source bundle identifies stable kernel commits and CVSS AV:L/PR:L/A:H. It does not prove remote reachability, data exposure, privilege escalation, or real-world exploitation.
Mitigation direction
- Update affected Linux kernels to vendor builds containing the stable fix.
- Check distribution advisories for backported fixes matching the referenced kernel commits.
- Prioritize multi-user systems and workloads where local code execution is available.
- Restrict unnecessary local administrative access until patched.
- Monitor for unexpected kernel panics around IPv6 module initialization.
Validation and detection
- Inventory running Linux kernel versions across hosts.
- Compare versions against affected ranges: 4.14.299 through 6.1 indicators in the bundle.
- Confirm vendor kernel packages include the referenced stable fix or equivalent backport.
- Review crash logs for neigh_table_clear, __neigh_ifdown, ndisc_cleanup, or inet6_init traces.
- Validate production systems remain stable after kernel update and reboot.
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-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-49904 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/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:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/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/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0CVE reference, Linux
- https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbeCVE reference, Linux
- https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27cCVE reference, Linux
- https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051CVE reference, Linux
- https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1CVE reference, Linux
- https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458CVE reference, Linux
- https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dadCVE 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.