Security readout for executives and security teams
Plain-English summary
A Linux kernel flaw in AF_XDP socket memory validation can leave too little packet space and may corrupt frame metadata. An authenticated local user could potentially compromise confidentiality, integrity, or availability. Systems not using AF_XDP/XSK are less likely to be exposed, but the supplied version data requires vendor confirmation.
Executive priority
Treat as a high-priority local privilege boundary issue on AF_XDP-enabled or multi-tenant Linux systems. Patch those systems promptly through supported vendor channels. Broader emergency action is not supported because remote exploitation and active exploitation are not evidenced in the supplied sources.
Technical view
xdp_umem_reg() insufficiently accounted for minimum frame space, alignment, tailroom, and later multi-buffer metadata. Unsafe UMEM headroom could prevent minimum Ethernet-frame reception or corrupt skb_shared_info at an XSK frame’s end. The correction reserves at least 128 bytes and accounts for tailroom during initial validation.
Likely exposure
Exposure primarily concerns Linux systems where a locally authenticated user or workload can configure AF_XDP/XSK UMEM. Network appliances, packet-processing platforms, and container hosts using AF_XDP deserve attention. The bundle lists several affected kernel versions, but its unusual version metadata and absent CPEs prevent reliable product-level scoping.
Exploitation context
The CVSS vector describes local, low-complexity exploitation requiring low privileges and no user interaction, with potentially high confidentiality, integrity, and availability impact. The bundle marks this CVE as absent from KEV and supplies no evidence of active exploitation or a public exploit.
Researcher notes
The record provides no CWE, CPEs, reproduction details, or exploitation evidence. Its affected-version data contains duplicates and an unusual "0" entry, so exact distribution exposure should not be inferred directly. Assess reachability through AF_XDP access controls and verify fixes using vendor backport information or referenced stable commits.
Mitigation direction
- Update to a vendor-supported kernel containing the applicable referenced stable fix.
- Confirm the corrected kernel package and reboot requirements with the operating-system vendor.
- Restrict untrusted users and workloads from configuring AF_XDP where operationally feasible.
- Prioritize packet-processing and multi-tenant systems that actively use XSK sockets.
Validation and detection
- Inventory running kernels and identify systems using AF_XDP or XSK-based applications.
- Map each kernel build to vendor advisories or the referenced stable commits.
- Verify the updated kernel is active after remediation, including required reboots.
- Confirm unsafe UMEM configurations are rejected in authorized regression testing.
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-2026-43093 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.
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/5f123bc278bf4e3283d8606321bebbfd299f4384CVE reference, Linux
- https://git.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67CVE reference, Linux
- https://git.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104CVE reference, Linux
- https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414fCVE reference, Linux
- https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1CVE reference, Linux
- https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12CVE reference, Linux
- https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39CVE reference, Linux
- https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931CVE 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.