CVE-2025-21796

In the Linux kernel, the following vulnerability has been resolved: nfsd: clear acl_access/acl_default after releasing them If getting acl_default fails, acl_access and acl_default will be released simultaneously. However, acl_access will still retain a pointer pointing to the released posix_acl, which will trigger a WARNING in nfs3svc_release_getacl like this: ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 26 PID: 3199 at lib/refcount.c:28 refcount_warn_saturate+0xb5/0x170 Modules linked in: CPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted 6.12.0-rc6-00079-g04ae226af01f-dirty #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb5/0x170 Code: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75 e4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff <0f> 0b eb cd 0f b6 1d 8a3 RSP: 0018:ffffc90008637cd8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380 RBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56 R10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001 R13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0 FS: 0000000000000000(0000) GS:ffff88871ed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ? refcount_warn_saturate+0xb5/0x170 ? __warn+0xa5/0x140 ? refcount_warn_saturate+0xb5/0x170 ? report_bug+0x1b1/0x1e0 ? handle_bug+0x53/0xa0 ? exc_invalid_op+0x17/0x40 ? asm_exc_invalid_op+0x1a/0x20 ? tick_nohz_tick_stopped+0x1e/0x40 ? refcount_warn_saturate+0xb5/0x170 ? refcount_warn_saturate+0xb5/0x170 nfs3svc_release_getacl+0xc9/0xe0 svc_process_common+0x5db/0xb60 ? __pfx_svc_process_common+0x10/0x10 ? __rcu_read_unlock+0x69/0xa0 ? __pfx_nfsd_dispatch+0x10/0x10 ? svc_xprt_received+0xa1/0x120 ? xdr_init_decode+0x11d/0x190 svc_process+0x2a7/0x330 svc_handle_xprt+0x69d/0x940 svc_recv+0x180/0x2d0 nfsd+0x168/0x200 ? __pfx_nfsd+0x10/0x10 kthread+0x1a2/0x1e0 ? kthread+0xf4/0x1e0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x60 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> Kernel panic - not syncing: kernel: panic_on_warn set ... Clear acl_access/acl_default after posix_acl_release is called to prevent UAF from being triggered.

Publication date: Thu, 27 Feb 2025 02:18:00 +0000

Cyber News related to CVE-2025-21796

CISA Releases Thirteen Industrial Control Systems Focusing Vulnerabilities & Exploits - An improper output neutralization for logs vulnerability CVE-2024-5594 in Siemens SINEMA Remote Connect Server. It allows a malicious OpenVPN peer to send garbage to the OpenVPN log or cause high CPU load. The advisory includes missing ...
3 weeks ago Cybersecuritynews.com CVE-2024-5594

CISA Releases 20 ICS Advisories Detailing Vulnerabilities & Exploits - Vulnerabilities in the SIPROTEC 5 series include Cleartext storage of sensitive information (CVE-2024-53651), which has a CVSS v3 base score of 4.6. Mitigation involves firmware updates and restricting network access. This SCADA management software ...
1 month ago Cybersecuritynews.com CVE-2024-53651 CVE-2025-25067 CVE-2025-24865 CVE-2025-22896 CVE-2025-23411 CVE-2023-37482 CVE-2024-54015 CVE-2022-38465 CVE-2025-24811 CVE-2025-20615 CVE-2025-24836 CVE-2025-23421 CVE-2024-53977 CVE-2025-23363 CVE-2025-1283 CVE-2025-23403 CVE-2025-26473 CVE-2025-25281 CVE-2025-24861

CVE-2025-21796 - In the Linux kernel, the following vulnerability has been resolved: ...
1 month ago

Apple backports zero-day patches to older iPhones and Macs - Apple has released security updates that backport fixes for actively exploited vulnerabilities that were exploited as zero-days to older versions of its operating systems. Specifically, the latest update for iOS 18.4 and iPadOS 18.4 fixes 77 ...
1 week ago Bleepingcomputer.com CVE-2025-30456

CVE-2022-21796 - A memory corruption vulnerability exists in the netserver parse_command_list functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to an out-of-bounds write. An attacker can send an HTTP request to trigger ...
1 year ago

CVE-2021-21796 - An exploitable use-after-free vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document can cause an object containing the path to a document to be destroyed and then later reused, resulting in a ...
2 years ago

CVE-2023-21796 - Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability ...
1 year ago

CVE-2024-21796 - Electronic Deliverables Creation Support Tool (Construction Edition) prior to Ver1.0.4 and Electronic Deliverables Creation Support Tool (Design & Survey Edition) prior to Ver1.0.4 improperly restrict XML external entity references (XXE). By ...
1 year ago

CISA Warns of Windows NTFS Vulnerability Actively Exploited to Access Sensitive Data - In an era where file system vulnerabilities comprise 23% of KEV entries, the March 2025 advisories serve as a stark reminder: patch, segment, and verify—before attackers exploit the gaps. These flaws CVE-2025-24984, CVE-2025-24991, CVE-2025-24993, ...
3 weeks ago Cybersecuritynews.com CVE-2025-24984

Palo Alto Networks tags new firewall bug as exploited in attacks - Palo Alto Networks warns that a file read vulnerability (CVE-2025-0111) is now being chained in attacks with two other flaws (CVE-2025-0108 with CVE-2024-9474) to breach PAN-OS firewalls in active attacks. "Palo Alto Networks has observed exploit ...
1 month ago Bleepingcomputer.com CVE-2025-0111 CVE-2025-0108 CVE-2024-9474

Recent Windows Server 2025 updates cause Remote Desktop freezes - Microsoft says a known issue is causing Remote Desktop freezes on Windows Server 2025 systems after installing security updates released since the February 2025 Patch Tuesday. "After installing the February 2025 Security update ...
1 week ago Bleepingcomputer.com

VMware Vulnerabilities Exploited Actively to Deploy Ransomware - On March 4, 2025, Broadcom released emergency updates to address three critical vulnerabilities – CVE-2025-22224, CVE-2025-22225, and CVE-2025-22226 – affecting several VMware products, including ESXi, Workstation, and Fusion. Given the ...
2 weeks ago Cybersecuritynews.com CVE-2025-22224

Windows 11 January 2025 Preview Update Disconnects Remote Desktop Sessions - Microsoft’s January 2025 Windows preview update (KB5050094) for Windows 11 version 24H2 has caused significant issues with Remote Desktop Protocol (RDP) sessions, including Remote Desktop Services (RDS). The policy, named “Windows 11 24H2 ...
1 week ago Cybersecuritynews.com

Multiple Dell Unity Vulnerabilities Let Attackers Compromise Affected System - Dell Technologies has released a critical security update addressing multiple severe vulnerabilities in its Unity enterprise storage systems that could allow attackers to execute arbitrary commands as root, delete critical system files, and perform ...
1 week ago Cybersecuritynews.com CVE-2024-49563

Paragon Partition Manager Vulnerabilities Let Attackers Escalate Privilege & Trigger DoS Attacks - Here the security analysts at Carnegie Mellon University noted that the most concerning aspect of these vulnerabilities is that they can be exploited even if Paragon Partition Manager isn’t installed on the target system, through a technique ...
1 month ago Cybersecuritynews.com CVE-2025-0286

41,500+ VMware ESXi Instances Vulnerable to Code Execution Attacks - We are scanning & reporting out VMware ESXi CVE-2025-22224 vulnerable instances ("a malicious actor with local admin privileges on a virtual machine may exploit this to execute code as virtual machine's VMX process running on ...
1 month ago Cybersecuritynews.com CVE-2025-22224

Microsoft fixes Remote Desktop issues caused by Windows updates - "After installing the January 2025 Windows preview update (KB5050094) and later updates, users might experience unexpected disconnections with Remote Desktop Protocol (RDP) sessions, including Remote Desktop Services (RDS)," the company said in a ...
1 week ago Bleepingcomputer.com

Ingress NGINX Remote Code Execution Vulnerability Let Attacker Takeover Cluster - It enables attackers to inject arbitrary NGINX configuration directives, potentially leading to remote code execution. It enables attackers to bypass validation checks and inject arbitrary NGINX configurations, potentially leading to remote code ...
2 weeks ago Cybersecuritynews.com CVE-2025-1974

Cybersecurity Weekly Recap: Key Updates on Attacks, Vulnerabilities, & Data Breaches - A critical flaw (CVE-2025-24813) in Apache Tomcat allows attackers to take control of servers or steal sensitive data via malicious file uploads. We’ll also review recent regulatory developments, such as the European Union’s General Data ...
2 days ago Cybersecuritynews.com CVE-2025-24813 Qilin

Over 37,000 VMware ESXi servers vulnerable to ongoing attacks - The Shadowserver Foundation reports that most of the vulnerable instances are in China (4,400), followed by France (4,100), the United States (3,800), Germany (2,800), Iran (2,800), and Brazil (2,200). Bill Toulas Bill Toulas is a tech writer and ...
1 month ago Bleepingcomputer.com CVE-2025-22225

Broadcom fixes three VMware zero-days exploited in attacks - CVE-2025-22225 is an ESXi arbitrary write vulnerability that allows the VMX process to trigger arbitrary kernel writes, leading to a sandbox escape, while CVE-2025-22226 is described as an HGFS information-disclosure flaw that lets threat actors with ...
1 month ago Bleepingcomputer.com CVE-2025-22225

New SuperBlack ransomware exploits Fortinet auth bypass flaws - A new ransomware operator named 'Mora_001' is exploiting two Fortinet vulnerabilities to gain unauthorized access to firewall appliances and deploy a custom ransomware strain dubbed SuperBlack. When Fortinet first disclosed CVE-2024-55591 on ...
3 weeks ago Bleepingcomputer.com LockBit CVE-2024-55591

Zoom Workplace Apps Vulnerability Let Attackers Inject Malicious Script - The vulnerabilities, detailed in Zoom Security Bulletin ZSB-25013, affect a wide range of Zoom Workplace applications, including desktop apps for Windows, macOS, and Linux and mobile apps for iOS and Android. Multiple null pointer dereference ...
19 hours ago Cybersecuritynews.com CVE-2025-30670

MediaTek Warns of Multiple Vulnerabilities that let Attackers Escalate Privileges - The UAE Cyber Security Council recommends immediate network segmentation for critical infrastructure using affected chipsets and continuous monitoring for anomalous base station associations. The March 2025 Product Security Bulletin highlights three ...
1 month ago Cybersecuritynews.com CVE-2025-20644

Ivanti patches Connect Secure zero-day exploited since mid-March - Ivanti has released security updates to patch a critical Connect Secure remote code execution vulnerability exploited by a China-linked espionage actor to deploy malware since at least mid-March 2025. While Ivanti has yet to disclose more details ...
5 days ago Bleepingcomputer.com CVE-2025-22457