Security readout for executives and security teams
Plain-English summary
A Linux netfilter cleanup race can leave asynchronous hardware-offload work running after its flow table is freed. This use-after-free may crash the system or corrupt kernel memory. The supplied CVSS rating is 7.8 because a local, low-privileged attacker could potentially affect confidentiality, integrity, and availability without user interaction.
Executive priority
Treat this as a high-priority kernel update for multi-user, edge, networking, and virtualization hosts using flow offload. It is less urgent where the feature is unused and untrusted local access is absent, but those conditions should be verified rather than assumed. No active exploitation evidence is supplied.
Technical view
Pending hardware add or statistics work can prevent deletion work from being queued during flowtable teardown. A later garbage-collection pass may queue deletion after the flow table has been freed, causing a kernel use-after-free. The fix flushes existing work before teardown, queues hardware removals, flushes again, and then removes software entries.
Likely exposure
Exposure is most likely on affected Linux systems using netfilter flowtables with hardware offload. The bundle lists versions 5.5, 5.15.64, 5.19.6, and 6.0 as affected, but distro backports may change status. Local low-privileged access is required by the supplied CVSS vector; network-only exposure is not established.
Exploitation context
The supplied sources do not report active exploitation, and the CVE is not listed as KEV in the bundle. A KASAN trace demonstrates the use-after-free during flowtable cleanup. Public evidence provided here establishes the defect and impact rating, but not a reliable exploitation technique or observed attacks.
Researcher notes
The failure is an asynchronous teardown ordering flaw in nf_flow_table. Pending add or statistics work causes hardware-delete scheduling to move past the original flush, allowing deletion work to dereference a freed flow table. Exact vulnerable ranges and downstream patch status are not fully resolved by the supplied version list, so vendor package mapping remains necessary.
Mitigation direction
- Upgrade to a vendor-supported kernel containing the applicable stable fix.
- Check distribution advisories for backported fixes and exact package versions.
- Prioritize systems using netfilter flowtables and hardware offload.
- Restrict untrusted local access until affected systems are updated.
Validation and detection
- Inventory running kernel versions and distribution package revisions.
- Confirm patched status against the distribution or kernel vendor advisory.
- Identify hosts loading or using netfilter flowtable hardware-offload functionality.
- After updating, verify the fixed kernel is running following any required 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
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ATT&CK lookup starting points
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CVE-2022-50000 mapping review
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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.
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:H1.85.9LinuxVulnerability 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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/8fbdec08dbf7d7ab8e35bdc65eb4394bc82d1e26CVE reference, Linux
- https://git.kernel.org/stable/c/89e135a36a9eb81412b5459df94a80995ce62eefCVE reference, Linux
- https://git.kernel.org/stable/c/9afb4b27349a499483ae0134282cefd0c90f480fCVE 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.