Security readout for executives and security teams
Plain-English summary
CVE-2025-21848 is a Linux kernel flaw that can crash affected systems by hitting a missing allocation failure check in the nfp BPF code path. It is mainly an availability risk, not a data theft or privilege escalation issue based on the provided CVSS data.
Executive priority
Treat this as a moderate operational resilience issue. It is not currently evidenced as actively exploited, but it can affect availability on systems where local users or workloads can reach the vulnerable kernel path.
Technical view
The kernel nfp BPF path did not check the return value of nfp_app_ctrl_msg_alloc() inside nfp_bpf_cmsg_alloc(), allowing a null pointer dereference. The CVSS vector is local, low complexity, low privileges, no user interaction, unchanged scope, and high availability impact only.
Likely exposure
Exposure is limited to affected Linux kernel versions and systems using the relevant nfp BPF driver path. The provided data lists Linux kernel versions and stable commits, but does not prove that every Linux deployment is practically reachable.
Exploitation context
The source bundle marks KEV as false and provides no evidence of active exploitation. The CVSS vector indicates an attacker would need local low-privileged access. No remote attack path is identified in the provided sources.
Researcher notes
Focus validation on kernel version lineage, downstream backports, and whether nfp BPF functionality is present and reachable. The evidence supports denial of service through null pointer dereference, not confidentiality or integrity impact.
Mitigation direction
- Update affected Linux kernels using vendor-supported packages or stable kernel fixes.
- Review Debian LTS advisories if running affected Debian-based systems.
- Check Siemens guidance for Siemens environments referenced by the advisory.
- Prioritize shared Linux hosts where local users or workloads are less trusted.
Validation and detection
- Inventory Linux kernel versions across servers, appliances, and embedded systems.
- Check whether systems run affected kernel branches listed in the CVE data.
- Confirm vendor advisories map your packaged kernel to the stable fix commits.
- Verify remediation through package changelogs or kernel build provenance.
Public sources used
- CVE Program
- CVE List V5
- Linux stable commit d64c6ca
- Linux stable commit e976ea6
- Linux stable commit 924b239
- Linux stable commit 1358d8e
- Linux stable commit 29ccb1e
- Linux stable commit 897c32c
- Linux stable commit bd97f60
- Linux stable commit 878e7b1
- Debian LTS announcement May 2025 00045
- Debian LTS announcement May 2025 00030
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.
CWE-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-21848 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/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:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/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/d64c6ca420019712e194fe095b55f87363e22a9aCVE reference, Linux
- https://git.kernel.org/stable/c/e976ea6c5e1b005c64467cbf94a8577aae9c7d81CVE reference, Linux
- https://git.kernel.org/stable/c/924b239f9704566e0d86abd894d2d64bd73c11ebCVE reference, Linux
- https://git.kernel.org/stable/c/1358d8e07afdf21d49ca6f00c56048442977e00aCVE reference, Linux
- https://git.kernel.org/stable/c/29ccb1e4040da6ff02b7e64efaa2f8e6bf06020dCVE reference, Linux
- https://git.kernel.org/stable/c/897c32cd763fd11d0b6ed024c52f44d2475bb820CVE reference, Linux
- https://git.kernel.org/stable/c/bd97f60750bb581f07051f98e31dfda59d3a783bCVE reference, Linux
- https://git.kernel.org/stable/c/878e7b11736e062514e58f3b445ff343e6705537CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.htmlCVE reference, CVE
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.