Security readout for executives and security teams
Plain-English summary
A Linux network-driver flaw can read beyond a fixed-size array when expected termination data is missing or malformed. Systems are potentially exposed only when the affected qede driver code is present and relevant. The supplied record rates it critical, but it does not document successful exploitation or confirmed real-world attacks.
Executive priority
Treat as an urgent patch-verification issue for systems actively using qede, especially critical network infrastructure. Do not classify the entire Linux estate as equally exposed. Establish driver usage first, then accelerate vendor-supported updates. Current evidence does not support declaring an active incident solely from this CVE.
Technical view
qede_tpa_cont() and qede_tpa_end() iterate over cqe->len_list[] until finding a zero-length entry. Without a valid terminator, iteration can exceed the array boundary. Linux stable fixes add ARRAY_SIZE() bounds to both loops. The supplied version data is ambiguous, so fixed status should be verified against kernel or distribution guidance.
Likely exposure
Prioritize Linux hosts using affected kernel branches with the qede network driver built, loaded, or actively serving traffic. Hosts without this driver code are less likely to be exposed. The bundled affected-version list contains unusual and duplicated entries, preventing reliable version-only conclusions without vendor confirmation.
Exploitation context
The supplied CVSS 3.1 score is 9.8 with network reachability, low complexity, no privileges, and no user interaction. However, the description establishes only a potential out-of-bounds read. The record is not in KEV, and the supplied sources provide no evidence of active exploitation, public weaponization, or demonstrated impact.
Researcher notes
No CWE is assigned in the supplied record. The stated critical CVSS impacts are broader than the description’s demonstrated potential out-of-bounds read. No crash, disclosure, corruption, or code-execution proof is supplied. Stable commits show the defensive bounds change, but branch-specific applicability must be mapped carefully.
Mitigation direction
- Apply a vendor-supported kernel containing the applicable stable fix.
- Check distribution and hardware-vendor advisories for precise fixed package versions.
- Where patching is delayed, assess whether the qede driver can be safely disabled or avoided.
- Prioritize exposed or operationally critical systems actively using the qede driver.
Validation and detection
- Inventory kernel versions and determine whether the qede driver is built, loaded, or used.
- Compare deployed kernel sources or packages with the applicable stable fix commit.
- Confirm vendor package changelogs explicitly reference CVE-2025-40252 or the qede bounds fix.
- After updating, verify the host runs the intended fixed kernel and retains expected networking.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2025-40252 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9LinuxVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/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.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/ecbb12caf399d7cf364b7553ed5aebeaa2f255bcCVE reference, Linux
- https://git.kernel.org/stable/c/a778912b4a53587ea07d85526d152f85d109cbfeCVE reference, Linux
- https://git.kernel.org/stable/c/f0923011c1261b33a2ac1de349256d39cb750dd0CVE reference, Linux
- https://git.kernel.org/stable/c/917a9d02182ac8b4f25eb47dc02f3ec679608c24CVE reference, Linux
- https://git.kernel.org/stable/c/e441db07f208184e0466abf44b389a81d70c340eCVE reference, Linux
- https://git.kernel.org/stable/c/896f1a2493b59beb2b5ccdf990503dbb16cb2256CVE reference, Linux
- https://cert-portal.siemens.com/productcert/html/ssa-253495.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.