Security readout for executives and security teams
Plain-English summary
A Linux networking flaw can crash the kernel while segmenting specially altered UDP traffic, causing service disruption or a system outage. The supplied assessment rates it CVSS 7.5 because exploitation may be remote, requires no privileges or user action, and primarily affects availability.
Executive priority
Treat as a high-priority availability issue for exposed Linux networking infrastructure, especially gateways and appliances. Patch through normal emergency maintenance where an affected build and relevant datapath are confirmed. Broader crisis action is not supported because the supplied sources show no active exploitation.
Technical view
UDP GSO frag-list packets can violate expected segment geometry after datapath processing pulls payload into the head buffer. NAT or BPF hooks are cited as possible modifiers. Passing the malformed layout to skb_segment can trigger a kernel BUG/Oops. The referenced kernel changes linearize packets failing basic frag-list invariants before segmentation.
Likely exposure
Exposure is most plausible on affected Linux kernels processing UDP GSO frag-list traffic, particularly where NAT or BPF datapath hooks modify packet buffers. The supplied version data identifies affected releases and commits but is not a complete distribution-specific inventory; administrators should confirm backports with their Linux vendor.
Exploitation context
The CVSS vector describes network-reachable, low-complexity, unauthenticated denial of service without user interaction. However, the bundle marks KEV false and provides no evidence of active exploitation or a public exploit. Practical reachability may depend on networking configuration and whether packet processing produces the invalid geometry.
Researcher notes
The failure arises when partial frag-list payload pulling changes segment lengths and violates SKB_GSO_FRAGLIST invariants. The documented outcome is a kernel BUG/Oops in skb_segment. Evidence supports denial of service, not confidentiality or integrity impact. The description acknowledges that the full number of problematic packet geometries is unknown.
Mitigation direction
- Upgrade to a vendor-supported kernel containing the applicable referenced fix.
- Check distribution or appliance advisories for backported patches and exact fixed package versions.
- Prioritize internet-facing routers, gateways, hosts, and appliances using Linux NAT or BPF networking.
- Follow vendor guidance if immediate kernel replacement is operationally constrained.
Validation and detection
- Record running kernel and package versions across Linux hosts and appliances.
- Compare each build with the CVE record and distribution-specific backport advisories.
- Identify systems processing UDP traffic through NAT, BPF, or GSO frag-list paths.
- Review kernel logs for BUG or Oops events referencing skb_segment and UDP GSO segmentation.
- After updating, verify the running kernel contains the vendor-provided correction.
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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CVE-2025-38124 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.
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:H3.93.6LinuxVulnerability 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/0e65f38bd1aa14ea86e221b7bb814d38278d86c3CVE reference, Linux
- https://git.kernel.org/stable/c/85eef1748c024da1a191aed56b30a3a65958c50cCVE reference, Linux
- https://git.kernel.org/stable/c/4399f59a9467a324ed46657555f0e1f209a14acbCVE reference, Linux
- https://git.kernel.org/stable/c/a04302867094bdc6efac1b598370fc47cf3f2388CVE reference, Linux
- https://git.kernel.org/stable/c/3382a1ed7f778db841063f5d7e317ac55f9e7f72CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlCVE reference, CVE
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlCVE reference, siemens-SADP
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.