Linux Kernel up to 6.14-rc1/6.14-rc2 sock_orphan null pointer dereference

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.14-rc1/6.14-rc2. This affects the function sock_orphan. The manipulation results in null pointer dereference. This vulnerability is known as CVE-2025-21755. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.14-rc1/6.14-rc2. It has been classified as critical. Affected is the function sock_orphan. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: vsock: Orphan socket after transport release During socket release, sock_orphan() is called without considering that it sets sk->sk_wq to NULL. Later, if SO_LINGER is enabled, this leads to a null pointer dereferenced in virtio_transport_wait_close(). Orphan the socket only after transport release. Partially reverts the 'Fixes:' commit. KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] lock_acquire+0x19e/0x500 _raw_spin_lock_irqsave+0x47/0x70 add_wait_queue+0x46/0x230 virtio_transport_release+0x4e7/0x7f0 __vsock_release+0xfd/0x490 vsock_release+0x90/0x120 __sock_release+0xa3/0x250 sock_close+0x14/0x20 __fput+0x35e/0xa90 __x64_sys_close+0x78/0xd0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2025-21755 since 12/29/2024. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 237088 (SUSE SLED15 / SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2025:01614-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.14-rc1 or 6.14-rc3 eliminates this vulnerability. Applying the patch f3b8e9d3414b2eb083d8293be25a949fe480897b/3a866f8376f0a5c848dcb59cd26df845fffbe6d8/94d81870eec7ad2dd7af80bffd314ded26caea1a/78dafe1cf3afa02ed71084b350713b07e72a18fb is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (237088) and CERT Bund (WID-SEC-2025-1944). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Google Android

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.14-rc1
• 6.14-rc2

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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