Security readout for executives and security teams
Plain-English summary
A Linux kernel flaw can crash IBM Z systems using a specific qeth network configuration. The failure occurs when the hsuid setting is first applied to an active IQD Layer 3 interface, leaving a network polling function unset. Exposure is specialized, but an affected production host could suffer an abrupt outage.
Executive priority
Prioritize affected IBM Z systems supporting critical workloads because successful triggering can panic the kernel and interrupt service. Broader emergency action is unnecessary for environments without s390 qeth IQD Layer 3 devices. Confirm exposure promptly, then patch through normal expedited kernel maintenance.
Technical view
On s390, qeth queue reinitialization can clear the NAPI poll callback without restoring it while the interface remains up. Subsequent network processing dereferences the null callback and causes a fatal kernel panic. The supplied CVSS 3.1 score is 7.8, with local access, low complexity, low privileges, and no user interaction.
Likely exposure
Likely exposure is limited to Linux on IBM Z/s390 systems using qeth IQD Layer 3 devices where hsuid may be set while the interface is already up. Ordinary Linux servers and systems without this hardware and configuration are not implicated by the supplied evidence. Distribution-specific affected versions require vendor verification.
Exploitation context
The source bundle does not establish active exploitation, and the CVE is not marked as included in CISA KEV. The supplied vector describes a local, low-privilege attack condition, but the exact permissions and practical path required to manipulate the relevant device configuration are not fully documented here.
Researcher notes
The demonstrated outcome is a null-function-pointer kernel panic after qeth queue state changes. Although the supplied CVSS vector rates confidentiality, integrity, and availability impacts high, the narrative evidence directly demonstrates availability loss only; evidence for data disclosure or modification is incomplete. Exact affected ranges should be validated against distribution backports and the cited stable commits.
Mitigation direction
- Update to a vendor-supported kernel containing the applicable stable fix for your kernel branch.
- Confirm the selected distribution package incorporates a cited upstream fix rather than relying only on version numbers.
- Until updated, avoid first setting hsuid while the affected IQD Layer 3 interface is up.
- Follow IBM and Linux distribution guidance for any platform-specific workaround or maintenance requirements.
Validation and detection
- Inventory IBM Z or s390 hosts, kernel builds, qeth drivers, and IQD Layer 3 interfaces.
- Determine whether operational tooling sets hsuid after bringing the corresponding interface up.
- Map each deployed kernel package to vendor advisories or the applicable cited stable commit.
- Review kernel and crash logs for null NAPI polling failures or matching qeth-related panics.
- Test remediation safely in a non-production environment using normal configuration workflows.
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
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ATT&CK lookup starting points
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CVE-2024-36928 mapping review
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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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:H1.85.9LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H0.83.6CISA-ADPVulnerability 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
Base CVSS 3.1 score
4.4MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/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/8792b557eb50b986f2496156d486d0c7c85a1524CVE reference, Linux
- https://git.kernel.org/stable/c/10cb803aff3b11fe0bd5f274fc1c231a43e88df6CVE reference, Linux
- https://git.kernel.org/stable/c/e28dd1e1bf3ebb52cdb877fb359e8978a51576e3CVE reference, Linux
- https://git.kernel.org/stable/c/eae0aec245712c52a3ce9c05575b541a9eef5282CVE reference, Linux
- https://git.kernel.org/stable/c/8a2e4d37afb8500b276e5ee903dee06f50ab0494CVE 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.