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PatchSiren cyber security CVE debrief

CVE-2026-74539 Linux CVE debrief

A vulnerability in the Linux kernel's Bluetooth ISO implementation could allow an attacker to access sensitive information. The issue arises from a missing lock in the `iso_sock_getname` function, which could lead to a use-after-free condition. This vulnerability has been resolved with a patch that adds the necessary lock. Linux kernel developers and maintainers, as well as users of Linux-based systems, should be aware of this vulnerability and take steps to apply the patch or verify the Linux kernel version. The CVE record and source item provide details about the vulnerability, including its description, affected versions, and references to patches.

Vendor
Linux
Product
Unknown
CVSS
HIGH 8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-15
Original CVE updated
2026-10-16
Advisory published
2026-08-15
Advisory updated
2026-10-16

Who should care

Linux kernel developers and maintainers, as well as users of Linux-based systems, should be aware of this vulnerability and take steps to apply the patch or verify the Linux kernel version.

Why it matters

A vulnerability in the Linux kernel's Bluetooth ISO implementation could allow an attacker to access sensitive information. Linux kernel developers and maintainers, as well as users of Linux-based systems, should be aware of this vulnerability and take steps to apply the patch or verify the Linux kernel version.

  • Verify Linux kernel version and apply patch if necessary
  • Monitor system for potential attacks
  • Review system configuration and ensure proper locking mechanisms are in place

Technical summary

The vulnerability is caused by a missing lock in the `iso_sock_getname` function, which could lead to a use-after-free condition. The issue has been resolved with a patch that adds the necessary lock. The patch ensures that the `iso_sock_getname` function holds the lock_sock, preventing potential use-after-free conditions. This fix is crucial for maintaining the security and stability of Linux kernel-based systems. The vulnerability affects Linux kernel versions and can be mitigated by applying the provided patch or updating to a patched version.

Defensive priority

Medium

Recommended defensive actions

  • Review and apply the patch to the Linux kernel
  • Verify the Linux kernel version and apply the patch if necessary
  • Monitor the system for potential attacks
  • Review system configuration and ensure proper locking mechanisms are in place
  • Perform regular security audits and vulnerability assessments
  • Implement additional security measures such as intrusion detection systems
  • Track and analyze potential attacks and vulnerabilities

Evidence notes

The CVE record and source item provide details about the vulnerability, including its description, affected versions, and references to patches. However, there is limited information about potential exploits or attacks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-74539 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-74539

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-74539 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-74539

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Bluetooth: ISO: lock sk in iso_sock_getname

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/74xxx/CVE-2026-74539.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/72d5bb1d77d7c3330146dc0cfd43f704c64b9594

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/202670e6602e068558c1fca2df40719ee91a2906

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/89cf154d7c18e6e94a3da83051f3cf2bac317ae2

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.