CVE-2026-63945 — CVE & Security Advisory Radar

🎯 CVE-2026-63945 🇪🇺 EUVD

📄 .md Alle CVEs anzeigen ✕

CVE-2026-63945 | In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock iso_sock_close() calls iso_sock_clear_timer() before acquiring lock_sock(sk). iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the socket lock held: if (!iso_pi(sk)->conn) return; cancel_delayed_work(&iso_pi(sk)->conn->timeout_work); Concurrently, iso_conn_del() executes under lock_sock(sk) and cal

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock

iso_sock_close() calls iso_sock_clear_timer() before acquiring
lock_sock(sk).

iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the
socket lock held:

if (!iso_pi(sk)->conn)
return;
cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);

Concurrently, iso_conn_del() executes under lock_sock(sk) and calls
iso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in
the final reference to the connection being dropped:

CPU0 CPU1
---- ----
iso_sock_clear_timer()
if (conn != NULL) ... lock_sock(sk)
iso_chan_del()
iso_pi(sk)->conn = NULL
cancel_delayed_work(conn) /* NULL deref or UAF */

iso_pi(sk)->conn is not stable across the unlock window, causing a
NULL pointer dereference or use-after-free.

Serialize iso_sock_clear_timer() with the socket lock by moving it
inside lock_sock()/release_sock(), matching the pattern used in
iso_conn_del() and all other call sites.

Klassifikation & Betroffenheit:

Linux Linux ccf74f2390d60a2f9a75ef496d2564abb478f46a <996c2104d0726a8fe584f85b3d6327197374a348Linux patch: 6.1.176Linux ccf74f2390d60a2f9a75ef496d2564abb478f46a <35f68f36d9883d56dec21cf85f7556d4657fc393Linux ccf74f2390d60a2f9a75ef496d2564abb478f46a <d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afaLinux patch: 6.6.143Linux ccf74f2390d60a2f9a75ef496d2564abb478f46a <51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5Linux ccf74f2390d60a2f9a75ef496d2564abb478f46a <bc08c15746f25f41dd0508b25780d1e84acbb2efLinux patch: 6.18.35

Improper Control of Generation of Code ('Code Injection') 🎯 Medium

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

🛡️ Empfohlene Mitigation: Refactor your program so that you do not have to dynamically generate code.

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-35 · Leverage Executable Code in Non-Executab… (Very High) CAPEC-77 · Manipulating User-Controlled Variables (Very High) CAPEC-242 · Code Injection (High)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1027.006 · Obfuscated Files or Information: H… T1027.009 · Obfuscated Files or Information: E… T1564.009 · Hide Artifacts: Resource Forking

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-90049 9.3 CVE-2026-89930 9.3 CVE-2026-89918 9.3 CVE-2026-89916 9.3 CVE-2026-89915 9.3

🩹 Patch verfügbar (OSV):

🩹 Kernel ≥ 6.1.176 🩹 Kernel ≥ 6.6.143 🩹 Kernel ≥ 6.12.93 🩹 Kernel ≥ 6.18.35 🩹 Kernel ≥ 7.0.12

📰 Eigene Berichterstattung: ➔ CVE-2026-63945 | Linux Kernel up to 7.0.11 Bluetooth Iso iso_sock_clear_timer us

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 07/2026

Heute 18.09.

CVSS-Vektor-Analyse: 7.8

AV · Angriffsvektor Lokal

AC · Komplexität Gering

PR · Privilegien Gering

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Hoch

I · Integrität Hoch

A · Verfügbarkeit Hoch

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Veröffentlicht:19.07.2026

Aktualisiert:27.07.2026 17:44

Assigner (CNA):Linux

EUVD-ID:EUVD-2026-45718

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Kernel-Paket aktualisieren (apt upgrade linux-image / yum update kernel) und System neu starten.

Tier	2026-08-29	2026-09-17
≥90 %	4	0
≥50 %	4	0
≥10 %	3	0
<10 %	304	300

EPSS

16%

CVE-2026-63945 💻 Lokal 🔑 Geringe Nutzerrechte nötig

Linux

CVE-2026-63945 | In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock iso_sock_close() calls iso_sock_clear_timer() before acquiring lock_sock(sk). iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the socket lock held: if (!iso_pi(sk)->conn) return; cancel_delayed_work(&iso_pi(sk)->conn->timeout_work); Concurrently, iso_conn_del() executes under lock_sock(sk) and cal

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Kernel-Paket aktualisieren (apt upgrade linux-image / yum update kernel) und System neu starten.

19.07.2026

🛡️ Details ➔

Zero-Day & Vulnerability Intelligence Hub