Security readout for executives and security teams
Plain-English summary
This Linux kernel flaw can leak packet memory in specific bridge VLAN handling. An attacker able to send suitable traffic to an affected Linux bridge could consume memory and degrade or deny service. The available sources describe availability impact only, not data theft or code execution.
Executive priority
Prioritize remediation for Linux-based network infrastructure that bridges VLAN traffic. The main business risk is service disruption from memory exhaustion, not confidentiality loss. Patch through normal emergency or accelerated infrastructure maintenance depending on exposure.
Technical view
The bug is in Linux bridge VLAN ingress handling in __allowed_ingress. With per-VLAN state, VLAN snooping and stats disabled, certain untagged or priority-tagged frames are dropped without freeing the skb when PVID state blocks forwarding or learning, causing a memory leak.
Likely exposure
Exposure is most relevant to Linux systems using kernel bridge VLAN features, especially network appliances, virtualization hosts, or servers bridging VLAN traffic. Systems not using Linux bridge VLAN ingress paths are less likely exposed. The bundle does not identify distributions or downstream package names.
Exploitation context
The CVSS vector indicates network, low-complexity, unauthenticated availability impact. The bundle states KEV is false and provides no cited evidence of active exploitation. Treat exploitation status as unconfirmed, not actively exploited.
Researcher notes
Evidence is limited to the CVE description and Linux stable commit references. The affected version data in the bundle is sparse, so downstream kernel package validation should rely on vendor advisories and commit backports rather than version strings alone.
Mitigation direction
- Check vendor kernel advisories for your distribution or appliance.
- Update to a kernel containing one of the referenced stable fixes.
- Prioritize internet- or untrusted-network-facing Linux bridges using VLAN filtering.
- Temporarily reduce exposure of affected bridge VLAN paths where patching is delayed.
- Monitor memory pressure and packet-drop symptoms on suspected bridge hosts.
Validation and detection
- Inventory Linux systems using bridge VLAN or related network appliance functions.
- Map running kernel versions against vendor advisories and referenced stable commits.
- Confirm whether VLAN snooping, stats, per-VLAN state, and PVID behavior match exposure conditions.
- Review operational monitoring for unexplained memory growth on bridge hosts.
- Verify patched kernels include the relevant stable commit for their branch.
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
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CWE-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-48748 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/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/446ff1fc37c74093e81db40811a07b5a19f1d797CVE reference, Linux
- https://git.kernel.org/stable/c/c5e216e880fa6f2cd9d4a6541269377657163098CVE reference, Linux
- https://git.kernel.org/stable/c/14be8d448fca6fe7b2a413831eedd55aef6c6511CVE reference, Linux
- https://git.kernel.org/stable/c/fd20d9738395cf8e27d0a17eba34169699fccdffCVE 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.