Security readout for executives and security teams
Plain-English summary
CVE-2022-49419 is a Linux kernel use-after-free bug in the vesafb framebuffer driver. A local authenticated user could potentially trigger kernel memory corruption with high impact to confidentiality, integrity, and availability. It is not listed as CISA KEV, and the provided sources do not show active exploitation.
Executive priority
Treat as a high-priority Linux kernel maintenance item, especially where local users, containers, or workloads are not fully trusted. It is not an internet-facing remote bug based on the provided CVSS vector, but successful exploitation could compromise the host.
Technical view
The vesafb driver could access fb_info after it was freed when .fb_destroy and .remove callbacks occurred in different orders. The fix moves access to info->par before unregister_framebuffer() can free fb_info. The CVE is classified as CWE-416 with CVSS 3.1 score 7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Likely exposure
Exposure is most relevant to Linux systems running affected kernel versions with the vesafb/fbdev path present or enabled. The source bundle lists affected Linux kernel versions and stable commit references, but it does not provide distribution-specific package status.
Exploitation context
Attack requires local privileges and no user interaction. The impact is kernel-level memory corruption, which can support privilege escalation or system crash scenarios. No provided source confirms public exploitation or inclusion in CISA KEV.
Researcher notes
The vulnerability centers on object lifetime ordering between unregister_framebuffer(), .fb_destroy, and vesafb_remove(). Validate by code review or vendor backport mapping rather than assuming version strings alone. The provided evidence names stable commits but not distro package identifiers.
Mitigation direction
- Review Linux vendor advisories for CVE-2022-49419 and apply the recommended kernel update.
- Confirm the running kernel includes one of the referenced stable fixes or equivalent backport.
- Prioritize shared, multi-user, workstation, and server systems allowing local shell access.
- If updates are delayed, reduce local untrusted user access where operationally possible.
Validation and detection
- Inventory Linux kernel versions across managed assets.
- Check whether vendor kernel packages include the referenced vesafb fix.
- Identify systems using or enabling vesafb/fbdev functionality.
- Document exceptions where kernels are custom-built or vendor backport status is unclear.
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-2022-49419 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/0fac5f8fb1bc2fc4f8714bf5e743c9cc3f547c63CVE reference, Linux
- https://git.kernel.org/stable/c/f605f5558ecc175ec70016a3c15f007cb6386531CVE reference, Linux
- https://git.kernel.org/stable/c/d260cad015945d1f4bb9b028a096f648506106a2CVE reference, Linux
- https://git.kernel.org/stable/c/acde4003efc16480375543638484d8f13f2e99a3CVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.