Security readout for executives and security teams
Plain-English summary
This Linux kernel flaw can crash systems that use VXLAN with nexthop load-balancing logic. The bug comes from using a hash value with the wrong size, which can make the kernel choose invalid nexthop bucket indexes. The public record does not provide a CVSS score or evidence of active exploitation.
Executive priority
Schedule remediation for infrastructure using Linux VXLAN overlays, especially production networking, virtualization, or container platforms. This is not supported as actively exploited in the supplied sources, but a kernel panic in network paths can cause service disruption.
Technical view
VXLAN transmit code passes skb_get_hash() output where nexthop selection expects a 31-bit hash. If the high bit is set, the signed int becomes negative. Hash-threshold groups can be biased toward the first entry, and resilient nexthop groups can index nh_buckets out of bounds, producing a kernel panic.
Likely exposure
Exposure is most likely on Linux systems using VXLAN together with nexthop groups, especially resilient or hash-threshold nexthop selection. Linux systems not using VXLAN or these nexthop paths are less likely to be affected. The source lists Linux kernel versions including 5.8, 5.10.190, 5.15.126, 6.1.45, 6.4.10, and 6.5 as affected.
Exploitation context
The source shows a crash scenario and kernel panic trace, but does not state public exploitation, weaponized exploit availability, or KEV listing. Treat this primarily as an availability risk until vendor advisories or operational evidence indicate broader impact.
Researcher notes
The key condition is a 32-bit skb hash reaching nexthop code that expects 31 bits. The clearest impact in the source is out-of-bounds bucket access and panic in resilient nexthop groups. The bundle lacks CVSS, CWE mapping, exploitability analysis, and distribution-specific fixed package data.
Mitigation direction
- Apply Linux vendor kernel updates containing the stable VXLAN nexthop hash fix.
- Prioritize hosts using VXLAN overlays and nexthop groups.
- If patching is delayed, review whether affected VXLAN nexthop configurations can be reduced.
- Monitor affected hosts for kernel panics in VXLAN or nexthop paths.
- Check distribution-specific advisories for backported fixes and package versions.
Validation and detection
- Inventory Linux kernel versions across systems using VXLAN overlays.
- Identify configurations using nexthop groups, especially resilient or hash-threshold groups.
- Confirm installed kernels include one of the referenced stable fixes or a vendor backport.
- Review crash logs for vxlan_xmit, nexthop_select_path, or nh_buckets faults.
- Track CVE-2023-53192 in vulnerability management until vendor status is confirmed.
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-2023-53192 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.
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/c650597647ecb318d02372277bdfd866c6829f78CVE reference, Linux
- https://git.kernel.org/stable/c/32ef2c0c6cf11a076f0280a7866b9abc47821e19CVE reference, Linux
- https://git.kernel.org/stable/c/7b8717658dff8b471cbfc124bf9b5ca4229579edCVE reference, Linux
- https://git.kernel.org/stable/c/23c195ce6f4aec86e1c9e1ea1c800381c4b465c7CVE reference, Linux
- https://git.kernel.org/stable/c/0756384fb1bd38adb2ebcfd1307422f433a1d772CVE 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.