Linux Kernel: NULL Pointer Dereference (CVE-2024-26897)
Published Last modified Sources: Siemens ProductCERT, SUSE, Debian, BSI, CVE.org, EUVD
What is affected, what to do
In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: delay all of ath9k_wmi_event_tasklet() until init is complete The ath9k_wmi_event_tasklet() used in ath9k_htc assumes that all the data structures have been fully initialised by the time it runs. However, because of the order in which things are initialised, this is not guaranteed to be the case, because the device is exposed to the USB subsystem before the ath9k driver initialisation is completed.
The available sources name no fixed version. Check the vendor guidance in the references below.
Conflicting version data — version display is hidden until the data is resolved.
Not sure whether and how you are affected? Ask a question about this vulnerability
Metrics
4.7
XIEM Effective CVSS
Highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
4.7
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: Siemens ProductCERT, SUSE, Debian, BSI, CVE.org, EUVD
0.2 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 8.5
Show all metrics
- Severity
- Medium
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 28.93 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 4.7 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 4.7
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 0.2 %
- Low — model estimates < 1% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 8.5
- Low — this CVE sits in the lower 10% of all CVEs scored today.
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
- CISA assessment (SSVC)
- Exploitation: none known · not automatable · Technical impact: partial
- Source: CISA Vulnrichment, as of 10 September 2024
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: delay all of ath9k_wmi_event_tasklet() until init is complete The ath9k_wmi_event_tasklet() used in ath9k_htc assumes that all the data structures have been fully initialised by the time it runs. However, because of the order in which things are initialised, this is not guaranteed to be the case, because the device is exposed to the USB subsystem before the ath9k driver initialisation is completed. We already committed a partial fix for this in commit: 8b3046abc99e ("ath9k_htc: fix NULL pointer dereference at ath9k_htc_tx_get_packet()") However, that commit only aborted the WMI_TXSTATUS_EVENTID command in the event tasklet, pairing it with an "initialisation complete" bit in the TX struct. It seems syzbot managed to trigger the race for one of the other commands as well, so let's just move the existing synchronisation bit to cover the whole tasklet (setting it at the end of ath9k_htc_probe_device() instead of inside ath9k_tx_init()).
Source: siemens_advisory, suse_csaf, Debian Security Advisories, BSI CSAF, BSI WID Portal, cvelistv5, NVD (NIST), ENISA EUVD
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| Linux | Linux |
|
|
Vendors and products
Affected operating systems
| Linux | debian | debian_linux | 10.0 |
| Linux | debian | linux | bullseye |
| Linux | linux | linux_kernel | — |
References & sources
- git.kernel.orgstable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905euvd
- git.kernel.orgstable/c/f8ff4b4df71e87f609be0cc37d92e918107f9b90euvd
- git.kernel.orgstable/c/74d0639261dd795dce958d1b14815bdcbb48a715euvd
- git.kernel.orgstable/c/a015fbf698c8957aa5fbeefc5c59dd2cf3107298euvd
- git.kernel.orgstable/c/ac90e22e735bac44f74b5161fb096fbeb0ff8bc2euvd
- git.kernel.orgstable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819beuvd
- git.kernel.orgstable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11euvd
- lists.debian.orgdebian-lts-announce/2024/06/msg00017.htmlx_transferred
- Siemens ProductCERTproductcert/html/ssa-265688.html
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Record modifiedLinux
New references:- https://git.kernel.org/stable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905
- https://git.kernel.org/stable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11
- https://git.kernel.org/stable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819b
- https://git.kernel.org/stable/c/74d0639261dd795dce958d1b14815bdcbb48a715
and 3 more references
Show 21 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905Reference added —https://git.kernel.org/stable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11Reference added —https://git.kernel.org/stable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819bReference added —https://git.kernel.org/stable/c/74d0639261dd795dce958d1b14815bdcbb48a715Reference added —https://git.kernel.org/stable/c/a015fbf698c8957aa5fbeefc5c59dd2cf3107298Reference added —https://git.kernel.org/stable/c/ac90e22e735bac44f74b5161fb096fbeb0ff8bc2Reference added —https://git.kernel.org/stable/c/f8ff4b4df71e87f609be0cc37d92e918107f9b90Reference removed https://git.kernel.org/stable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905—Reference removed https://git.kernel.org/stable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11—Reference removed https://git.kernel.org/stable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819b—Reference removed https://git.kernel.org/stable/c/74d0639261dd795dce958d1b14815bdcbb48a715—Reference removed https://git.kernel.org/stable/c/a015fbf698c8957aa5fbeefc5c59dd2cf3107298—Reference removed https://git.kernel.org/stable/c/ac90e22e735bac44f74b5161fb096fbeb0ff8bc2—Reference removed https://git.kernel.org/stable/c/f8ff4b4df71e87f609be0cc37d92e918107f9b90—Reference type removed https://git.kernel.org/stable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905 Types: Patch—Reference type removed https://git.kernel.org/stable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11 Types: Patch—Reference type removed https://git.kernel.org/stable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819b Types: Patch—Reference type removed https://git.kernel.org/stable/c/74d0639261dd795dce958d1b14815bdcbb48a715 Types: Patch—Reference type removed https://git.kernel.org/stable/c/a015fbf698c8957aa5fbeefc5c59dd2cf3107298 Types: Patch—Reference type removed https://git.kernel.org/stable/c/ac90e22e735bac44f74b5161fb096fbeb0ff8bc2 Types: Patch—Reference type removed https://git.kernel.org/stable/c/f8ff4b4df71e87f609be0cc37d92e918107f9b90 Types: Patch—Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Record modifiedCVE Program
New references:- https://git.kernel.org/stable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905
- https://git.kernel.org/stable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11
- https://git.kernel.org/stable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819b
- https://git.kernel.org/stable/c/74d0639261dd795dce958d1b14815bdcbb48a715
and 4 more references
Show 24 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905Reference added —https://git.kernel.org/stable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11Reference added —https://git.kernel.org/stable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819bReference added —https://git.kernel.org/stable/c/74d0639261dd795dce958d1b14815bdcbb48a715Reference added —https://git.kernel.org/stable/c/a015fbf698c8957aa5fbeefc5c59dd2cf3107298Reference added —https://git.kernel.org/stable/c/ac90e22e735bac44f74b5161fb096fbeb0ff8bc2Reference added —https://git.kernel.org/stable/c/f8ff4b4df71e87f609be0cc37d92e918107f9b90Reference added —https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlReference removed https://git.kernel.org/stable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905—Reference removed https://git.kernel.org/stable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11—Reference removed https://git.kernel.org/stable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819b—Reference removed https://git.kernel.org/stable/c/74d0639261dd795dce958d1b14815bdcbb48a715—Reference removed https://git.kernel.org/stable/c/a015fbf698c8957aa5fbeefc5c59dd2cf3107298—Reference removed https://git.kernel.org/stable/c/ac90e22e735bac44f74b5161fb096fbeb0ff8bc2—Reference removed https://git.kernel.org/stable/c/f8ff4b4df71e87f609be0cc37d92e918107f9b90—Reference removed https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html—Reference type removed https://git.kernel.org/stable/c/1bc5461a21c56a36e2a7d81e152b90ce019a3905 Types: Patch—Reference type removed https://git.kernel.org/stable/c/24355fcb0d4cbcb6ddda262596558e8cfba70f11 Types: Patch—Reference type removed https://git.kernel.org/stable/c/4afa0246656d5680c8a4c3fb37ba6570c4ab819b Types: Patch—Reference type removed https://git.kernel.org/stable/c/74d0639261dd795dce958d1b14815bdcbb48a715 Types: Patch—Reference type removed https://git.kernel.org/stable/c/a015fbf698c8957aa5fbeefc5c59dd2cf3107298 Types: Patch—Reference type removed https://git.kernel.org/stable/c/ac90e22e735bac44f74b5161fb096fbeb0ff8bc2 Types: Patch—Reference type removed https://git.kernel.org/stable/c/f8ff4b4df71e87f609be0cc37d92e918107f9b90 Types: Patch—Reference type removed https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html Types: Third Party Advisory—Source identifier: af854a3a-2127-422b-91ae-364da2661108
Record modifiedSiemens ADP
Show 3 original changes
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) added —Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2024/26xxx/CVE-2024-26897.json">CVE-2024-26897</a>Reference added —https://cert-portal.siemens.com/productcert/html/ssa-265688.htmlReference removed https://cert-portal.siemens.com/productcert/html/ssa-265688.html—Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Embed badge
Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.
<a href="https://intel.neosec.eu/en/cve/CVE-2024-26897"><img src="https://intel.neosec.eu/badge/cve/CVE-2024-26897.svg?lang=en" alt="CVE-2024-26897 – NEOSEC Intel" height="20"></a>