CVE-2025-21755
Published: February 28, 2025Last modified: July 22, 2025
Description
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
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Unknown (6.1.33-r0) |
| Stream | linux-lts | Unknown (6.1.33-r0) |
References
- https://git.kernel.org/stable/c/3a866f8376f0a5c848dcb59cd26df845fffbe6d8
- https://git.kernel.org/stable/c/631e00fdac7acca676103d6cbc96eb152625f449
- https://git.kernel.org/stable/c/78dafe1cf3afa02ed71084b350713b07e72a18fb
- https://git.kernel.org/stable/c/94d81870eec7ad2dd7af80bffd314ded26caea1a
- https://git.kernel.org/stable/c/bab61f41c942a20ef7b4feea50e9d36d19ad1a26
- https://git.kernel.org/stable/c/c6acb650a73d5705a93b9c5a2cd5e9c8161f0be3
- https://git.kernel.org/stable/c/f3b8e9d3414b2eb083d8293be25a949fe480897b