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CVE-2026-53253 Linux CVE debrief

CVE-2026-53253 is a HIGH severity vulnerability in the Linux kernel Bluetooth BNEP component. The vulnerability allows a BNEP peer to send a short BNEP SDU, which can cause a slab-out-of-bounds read. The issue has been resolved by rejecting short frames before parsing. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 7.1. The CVE was published on 2026-06-25T09:16:43.253Z and modified on 2026-06-28T08:16:41.040Z.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-25
Original CVE updated
2026-07-08
Advisory published
2026-06-25
Advisory updated
2026-07-08

Who should care

Linux kernel developers and maintainers, Bluetooth BNEP component users, and organizations using Linux-based systems should be aware of this vulnerability. The vulnerability can be exploited by a remote attacker to cause a denial-of-service (DoS) or potentially execute arbitrary code. Affected systems should apply the patch or mitigation as soon as possible.

Technical summary

The vulnerability is caused by the lack of input validation in the bnep_rx_frame function, which allows a BNEP peer to send a short BNEP SDU. The issue has been resolved by using skb_pull_data() to validate the fixed fields in bnep_rx_frame() and splitting the control handler to pass an opcode that has already been pulled. The patch also documents the UUID-size byte explicitly to prevent similar issues in the future.

Defensive priority

High priority should be given to applying the patch or mitigation for this vulnerability. Affected systems should be updated as soon as possible to prevent exploitation.

Recommended defensive actions

  • Apply the patch to update the Linux kernel Bluetooth BNEP component
  • Use skb_pull_data() to validate fixed fields in bnep_rx_frame()
  • Split the control handler to pass an opcode that has already been pulled
  • Document the UUID-size byte explicitly to prevent similar issues in the future
  • Monitor Linux kernel updates and apply patches promptly

Evidence notes

The vulnerability was reported by an unknown source and has been resolved by the Linux kernel developers. The CVE record and NVD detail provide additional information about the vulnerability. The source item URL provides access to the NVD JSON data for this CVE.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53253 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53253

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

  • CVE-2026-53253 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53253

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/0ef2ea86c82b2615902d085cd5a586fe9f58994f

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/2b83afb19293e4de700edae306115f18966dc4f9

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/6770d3a8acdf9151769180cc3710346c4cfbe6f0

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/691f14b6a48b637655755134f1e551c7c6fedc2e

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/be837cd09897e9e6e1958174501d467bdcbcc2bc

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/c893e17d2809ec9c4b3f1cdd5847cecbc27a311b

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/d76dec1a37122bc16d83d059c08c0512ea8de909

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

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.