Security readout for executives and security teams
Plain-English summary
A flaw in Linux’s WL1251 Wi-Fi driver can let an invalid firmware completion identifier access memory outside a small tracking array. The supplied CVSS score is 8.8, indicating potentially serious confidentiality, integrity, and availability impact. Exposure is limited to systems using the affected driver; the source bundle does not establish practical exploitation conditions.
Executive priority
Prioritize timely remediation where WL1251 hardware is present, particularly on sensitive or operationally important systems. Broad emergency action across all Linux assets is not justified by the supplied evidence. First identify actual driver usage, then apply vendor-provided kernel updates. Escalate if credible exploitation evidence emerges.
Technical view
wl1251_tx_packet_cb() uses a raw u8 firmware completion ID to index the 16-entry wl->tx_frames[] array without first validating its range. An ID above 15 can cause an out-of-bounds dereference in kernel context. The referenced fix rejects out-of-range IDs while retaining the existing NULL check at the firmware trust boundary.
Likely exposure
Likely exposure is limited to Linux systems containing and using the WL1251 wireless driver and compatible hardware. The affected-version data spans multiple kernel branches but is insufficient to identify exact vulnerable distribution packages. Systems without this driver or hardware are unlikely to be exposed through this code path.
Exploitation context
The supplied CVSS vector rates the attack as adjacent, low complexity, unauthenticated, and requiring no user interaction. However, the bundle does not explain how an attacker controls the firmware completion ID. The CVE is not listed as KEV, and no cited source establishes active exploitation or a public exploit.
Researcher notes
The defect is an unchecked index crossing a firmware-to-kernel trust boundary. The fix is narrowly scoped: validate the completion ID against the tx_frames array size and combine that condition with the NULL guard. The sources do not identify the resulting crash signature, memory-corruption primitive, reachable trigger mechanism, or exploit reliability; those points remain unverified.
Mitigation direction
- Install a vendor-supported kernel containing the applicable referenced stable fix or backport.
- Consult the Linux distribution or device vendor for exact fixed package versions.
- Prioritize WL1251 systems operating in untrusted adjacent-network environments.
- If patching is delayed, avoid using affected WL1251 hardware where operationally feasible.
Validation and detection
- Inventory systems for WL1251 hardware and the wl1251 kernel driver.
- Determine whether the wl1251 driver is built, installed, or loaded.
- Compare each kernel package against vendor advisories and referenced stable commits.
- Confirm the deployed kernel includes the completion-ID bounds check.
- Regression-test WL1251 transmission after updating and review kernel logs for failures.
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-2026-43113 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:A/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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/6509dbece7339dbc8980c706b9d623119a6de105CVE reference, Linux
- https://git.kernel.org/stable/c/a8a11a876f0a97061ee5d9e61d0f5a0df7e241c7CVE reference, Linux
- https://git.kernel.org/stable/c/e0dc1ad870d6788b049bfe1511ac75b2333a7550CVE reference, Linux
- https://git.kernel.org/stable/c/b6ba1eacf276063ebeefbbae8056043c24f2efafCVE reference, Linux
- https://git.kernel.org/stable/c/df15adc692a802636dd3f258fc7cca8bf7a0ed9aCVE reference, Linux
- https://git.kernel.org/stable/c/8d7465be5163a923ee5d7459719ef5a021c1584aCVE reference, Linux
- https://git.kernel.org/stable/c/26ee518695c484f75e3606d631278e84bd24ae02CVE reference, Linux
- https://git.kernel.org/stable/c/0fd56fad9c56356e7fa7a7c52e7ecbf807a44eb0CVE 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.