CVE-2026-74530 - Vulnerability Details - OpenCVE

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to match the previous behavior.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Vendors	Products
Linux	Linux Kernel

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors	Products

References

Link	Providers
https://git.kernel.org/stable/c/2d91e6244b69d752503b2d44020d8b0e323dbd38
https://git.kernel.org/stable/c/56e78b670356caab0b607e8aad4cf819a1909d07

History

Sat, 15 Aug 2026 15:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-416 CWE-476

Sat, 15 Aug 2026 12:45:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to match the previous behavior.
Title		Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/2d91e6244b69d752503b2d44020d8b0e323dbd38 https://git.kernel.org/stable/c/56e78b670356caab0b607e8aad4cf819a1909d07

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-08-15T12:27:45.381Z

Updated: 2026-08-15T12:27:45.381Z

Reserved: 2026-08-15T05:44:03.912Z

Link: CVE-2026-74530

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-08-15T13:17:58.297

Modified: 2026-08-15T13:17:58.297

Link: CVE-2026-74530

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-15T14:45:03Z

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74530", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.912Z", "datePublished": "2026-08-15T12:27:45.381Z", "dateUpdated": "2026-08-15T12:27:45.381Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:27:45.381Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_big_sync() callback\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to\nmatch the previous behavior."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_sync.c"], "versions": [{"version": "024421cf39923927ab2b5fe895d1d922b9abe67f", "lessThan": "2d91e6244b69d752503b2d44020d8b0e323dbd38", "status": "affected", "versionType": "git"}, {"version": "024421cf39923927ab2b5fe895d1d922b9abe67f", "lessThan": "56e78b670356caab0b607e8aad4cf819a1909d07", "status": "affected", "versionType": "git"}, {"version": "620810ac1f7f1133a9ac403e132b3ad6995ddf39", "status": "affected", "versionType": "git"}, {"version": "ee0586ad64a805eaf1a9a10100e908627a561e34", "status": "affected", "versionType": "git"}, {"version": "6.12.28", "lessThan": "6.13", "status": "affected", "versionType": "semver"}, {"version": "6.14.6", "lessThan": "6.15", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_sync.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc6", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2-rc6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.28"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14.6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2d91e6244b69d752503b2d44020d8b0e323dbd38"}, {"url": "https://git.kernel.org/stable/c/56e78b670356caab0b607e8aad4cf819a1909d07"}], "title": "Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback", "x_generator": {"engine": "bippy-1.2.0"}}}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/hci_sync.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2d91e6244b69d752503b2d44020d8b0e323dbd38", "status": "affected", "version": "024421cf39923927ab2b5fe895d1d922b9abe67f", "versionType": "git"}, {"lessThan": "56e78b670356caab0b607e8aad4cf819a1909d07", "status": "affected", "version": "024421cf39923927ab2b5fe895d1d922b9abe67f", "versionType": "git"}, {"status": "affected", "version": "620810ac1f7f1133a9ac403e132b3ad6995ddf39", "versionType": "git"}, {"status": "affected", "version": "ee0586ad64a805eaf1a9a10100e908627a561e34", "versionType": "git"}, {"lessThan": "6.13", "status": "affected", "version": "6.12.28", "versionType": "semver"}, {"lessThan": "6.15", "status": "affected", "version": "6.14.6", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/hci_sync.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc6", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_big_sync() callback\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to\nmatch the previous behavior."}], "id": "CVE-2026-74530", "lastModified": "2026-08-15T13:17:58.297", "metrics": {}, "published": "2026-08-15T13:17:58.297", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2d91e6244b69d752503b2d44020d8b0e323dbd38"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/56e78b670356caab0b607e8aad4cf819a1909d07"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}