CVE-2026-74537

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: hold sk properly in iso_conn_ready sk deref in iso_conn_ready must be done either under conn->lock, or holding a refcount, to avoid concurrent close. conn->sk is currently accessed without either: [Task 1] [Task 2] iso_sock_release iso_conn_ready sk = conn->sk lock_sock(sk) conn->sk = NULL lock_sock(sk) release_sock(sk) iso_sock_kill(sk) UAF on sk deref Fix possible UAF by holding sk refcount in iso_conn_ready(). Also recheck after lock_sock that the socket is still valid. Adjust locking so conn->sk is cleared only under lock_sock.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0d255e63fcf3f13a570d7ac11678fa1164ac015c
https://git.kernel.org/stable/c/1308d72903d792d10b82bc4ef08b8a4452308b04
https://git.kernel.org/stable/c/4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 13:17

Updated : 2026-08-17 06:19

NVD link : CVE-2026-74537

Mitre link : CVE-2026-74537

CVE.ORG link : CVE-2026-74537

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-74537", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5", "versionType": "git"}, {"status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "1308d72903d792d10b82bc4ef08b8a4452308b04", "versionType": "git"}, {"status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "0d255e63fcf3f13a570d7ac11678fa1164ac015c", "versionType": "git"}], "programFiles": ["net/bluetooth/iso.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.44", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.8", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/iso.c"], "defaultStatus": "affected"}]}], "published": "2026-08-15T13:17:59.040", "references": [{"url": "https://git.kernel.org/stable/c/0d255e63fcf3f13a570d7ac11678fa1164ac015c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1308d72903d792d10b82bc4ef08b8a4452308b04", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: hold sk properly in iso_conn_ready\n\nsk deref in iso_conn_ready must be done either under conn->lock, or\nholding a refcount, to avoid concurrent close. conn->sk is currently\naccessed without either:\n\n [Task 1] [Task 2]\n iso_sock_release\n iso_conn_ready\n sk = conn->sk\n lock_sock(sk)\n conn->sk = NULL\n lock_sock(sk)\n release_sock(sk)\n iso_sock_kill(sk)\n UAF on sk deref\n\nFix possible UAF by holding sk refcount in iso_conn_ready(). Also\nrecheck after lock_sock that the socket is still valid. Adjust locking\nso conn->sk is cleared only under lock_sock."}], "lastModified": "2026-08-17T06:19:50.807", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}