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The vulnerability of the smb_break_all_levII_oplock() function in the fs/smb/server/oplock.c module of the SMB server of the Linux operating system allows a attacker to compromise the confidentiality, integrity, and accessibility of the protected information.

🗓️ 05 Feb 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec🔗 bdu.fstec.ru👁 1 Views

Vulnerability in smb_break_all_levII_oplock causes use-after-free in the Linux SMB server risking confidentiality, integrity, and availability.

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Refs
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AstraLinux		Astra Linux – Vulnerability in Linux 5.10
19 Jun 202611:10
–astralinux
Tenable Nessus		Azure Linux 3.0 Security Update: kernel (CVE-2025-37776)
22 Jan 202600:00
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Tenable Nessus		Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2025-20480)
18 Jul 202500:00
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Tenable Nessus		Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2025-20530)
19 Aug 202500:00
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Tenable Nessus		TencentOS Server 4: kernel (TSSA-2025:0435)
20 Nov 202500:00
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Tenable Nessus		Ubuntu 25.04 : Linux kernel vulnerabilities (USN-7594-1)
26 Jun 202500:00
–nessus
Tenable Nessus		Linux Distros Unpatched Vulnerability : CVE-2025-37776
15 Aug 202500:00
–nessus
CBLMariner		CVE-2025-37776 affecting package kernel for versions less than 6.6.92.2-1
10 Jul 202515:09
–cbl_mariner
Circl		CVE-2025-37776
19 Mar 202600:00
–circl
CNNVD		Linux kernel 安全漏洞
1 May 202500:00
–cnnvd
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05 Feb 2026 00:00Current
6.7Medium risk
Vulners AI Score6.7
CVSS 26
CVSS 37
EPSS0.00143
smb serverlinuxuse after freeoplockmemory vulnerability
1