Security readout for executives and security teams
Plain-English summary
CVE-2022-49727 is a Linux kernel flaw in IPv6 L2TP message handling. A low-privileged local user may trigger a signed integer overflow that can crash or disrupt the system. It is not described as remote code execution, and the sources do not show active exploitation.
Executive priority
Treat as a routine but real availability risk. Prioritize patching on shared Linux infrastructure and systems where local users are less trusted. It does not warrant emergency response based on the provided evidence alone.
Technical view
The issue is CWE-190 in l2tp_ip6_sendmsg. When len is near INT_MAX, adding transhdrlen can overflow ulen. The kernel fix follows udpv6-style bounds checking by subtracting the transport header length from the maximum allowed length before accepting the message size.
Likely exposure
Exposure is limited to Linux systems running affected kernel versions or downstream builds without the referenced stable fixes. The practical concern is higher on shared systems where low-privileged local users can reach the vulnerable kernel path.
Exploitation context
The CVSS vector is local, low complexity, low privileges, no user interaction, with high availability impact. KEV is false in the provided data. No cited source in the bundle confirms active exploitation or public weaponization.
Researcher notes
The affected component is the IPv6 L2TP sendmsg path. Analysis should focus on kernel builds derived from affected versions and whether the stable commits are present. The source bundle does not provide exploit details, proof of exploitation, or distro-specific fixed package names.
Mitigation direction
- Update to a vendor-supported kernel containing the referenced stable fixes.
- Check Linux distribution advisories for fixed package versions.
- Prioritize shared or multi-user Linux systems.
- Reboot after kernel updates when required by the vendor.
- Track any affected long-term kernel lines still in use.
Validation and detection
- Inventory Linux kernel versions across servers and appliances.
- Compare running kernels with vendor fixed versions or referenced stable commits.
- Confirm whether shared local user access exists on affected systems.
- Verify patched kernels are loaded after reboot.
- Document any systems awaiting vendor guidance or maintenance windows.
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-190: 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-2022-49727 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/2cf73c7cb6125083408d77f43d0e84d86aed0000CVE reference, Linux
- https://git.kernel.org/stable/c/0e818d433fc2718fe4da044ffca7431812a7e04eCVE reference, Linux
- https://git.kernel.org/stable/c/6c4e3486d21173d60925ef52e512cae727b43d30CVE reference, Linux
- https://git.kernel.org/stable/c/2f42389d270f2304c8855b0b63498a5a4d0c053dCVE reference, Linux
- https://git.kernel.org/stable/c/b8879ca1fd7348b4d5db7db86dcb97f60c73d751CVE reference, Linux
- https://git.kernel.org/stable/c/27a37755ceb401111ded76810359d3adc4b268a1CVE reference, Linux
- https://git.kernel.org/stable/c/034246122f5c5e2e2a0b9fe04e24517920e9beb1CVE reference, Linux
- https://git.kernel.org/stable/c/f638a84afef3dfe10554c51820c16e39a278c915CVE 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.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.