Security readout for executives and security teams
Plain-English summary
CVE-2022-50819 is a Linux kernel udmabuf bug that can crash the kernel when an error path leaves an invalid scatter-gather table pointer behind. The known impact is availability, not data theft. Public sources show a kernel fix, but no CVSS score and no KEV-listed active exploitation.
Executive priority
Treat as a patch-management item for Linux availability risk. It is not currently supported by public evidence of active exploitation, remote attack, or confidentiality impact. Prioritize shared, multi-tenant, or reliability-sensitive Linux systems after confirming vendor applicability.
Technical view
In drivers/dma-buf/udmabuf.c, if scatter-gather table creation fails during a userspace dmabuf mapping attempt, ubuf->sg was not reset to NULL. Later, closing the dmabuf file descriptor could make release_udmabuf free an invalid sg table, causing a general protection fault/null-pointer dereference. The fix sets ubuf->sg = NULL on failure.
Likely exposure
Exposure is limited to Linux systems running affected kernel code with udmabuf reachable by local users or processes. The source does not establish remote exposure, privilege requirements, or affected distributions. Vulnerability managers should map kernel versions and vendor backports rather than rely only on upstream version numbers.
Exploitation context
The evidence is a syzbot-reported crash on a 5.19 syzkaller kernel. The CVE is not listed in KEV, and the provided sources do not claim active exploitation. Triggering depends on a userspace dmabuf mapping failure path, such as allocation failure, followed by cleanup.
Researcher notes
The public record lacks CVSS, CWE, distribution impact, and exploitability details. The crash path is clearly described in udmabuf cleanup after sg table creation failure. Avoid over-scoping: the sources support kernel denial-of-service risk, not privilege escalation or remote compromise.
Mitigation direction
- Apply Linux kernel updates that include the referenced upstream stable fixes.
- Check your Linux distribution advisories for backported fixes for CVE-2022-50819.
- Prioritize multi-user systems where local kernel crashes create operational risk.
- If udmabuf is unnecessary, review vendor-supported options to reduce exposure.
Validation and detection
- Inventory running kernel versions across Linux hosts.
- Confirm whether vendor packages include the referenced udmabuf fix commits.
- Review kernel logs for udmabuf, dma-buf, or general protection fault crashes.
- Track remediation by distribution advisory, not only upstream kernel version.
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.
CVE-2022-50819 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/bbe2f6f90310b3a0b5de4e0dc022b36faabfd718CVE reference
- https://git.kernel.org/stable/c/dfbed8c92eb853929f4fa676ba493391dab47be4CVE reference
- https://git.kernel.org/stable/c/fc285549f454c0f50f87ec945fc0bf44719c0fa4CVE reference
- https://git.kernel.org/stable/c/9861e43f097a50678041f973347b3a88f2da09cfCVE reference
- https://git.kernel.org/stable/c/d9c04a1b7a15b5e74b2977461d9511e497f05d8fCVE reference
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.