CVE-2025-40290

Description

In the Linux kernel, the following vulnerability has been resolved:xsk: avoid data corruption on cq descriptor numberSince commit 30f241fcf52a (xsk: Fix immature cq descriptorproduction), the descriptor number is stored in skb control block andxsk_cq_submit_addr_locked() relies on it to put the umem addrs ontopools completion queue.skb control block shouldnt be used for this purpose as after transmitxsk doesnt have control over it and other subsystems could use it. Thisleads to the following kernel panic due to a null pointer dereference. BUG: kernel null pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 2 UID: 1 PID: 927 Comm: p4xsk.bin Not tainted 6.16.12+deb14-cloud-amd64 #1 PREEMPT(lazy) Debian 6.16.12-1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 RIP: 0010:xsk_destruct_skb+0xd0/0x180 [...] Call Trace: napi_complete_done+0x7a/0x1a0 ip_rcv_core+0x1bb/0x340 ip_rcv+0x30/0x1f0 __netif_receive_skb_one_core+0x85/0xa0 process_backlog+0x87/0x130 __napi_poll+0x28/0x180 net_rx_action+0x339/0x420 handle_softirqs+0xdc/0x320 handle_edge_irq+0x90/0x1e0 do_softirq.part.0+0x3b/0x60 __local_bh_enable_ip+0x60/0x70 __dev_direct_xmit+0x14e/0x1f0 __xsk_generic_xmit+0x482/0xb70 __remove_hrtimer+0x41/0xa0 __xsk_generic_xmit+0x51/0xb70 _raw_spin_unlock_irqrestore+0xe/0x40 xsk_sendmsg+0xda/0x1c0 __sys_sendto+0x1ee/0x200 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x84/0x2f0 __pfx_pollwake+0x10/0x10 __rseq_handle_notify_resume+0xad/0x4c0 restore_fpregs_from_fpstate+0x3c/0x90 switch_fpu_return+0x5b/0xe0 do_syscall_64+0x204/0x2f0 do_syscall_64+0x204/0x2f0 do_syscall_64+0x204/0x2f0 entry_SYSCALL_64_after_hwframe+0x76/0x7e [...] Kernel panic - not syncing: Fatal exception in interrupt Kernel Offset: 0x1c000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)Instead use the skb destructor_arg pointer along with pointer tagging.As pointers are always aligned to 8B, use the bottom bit to indicatewhether this a single address or an allocated struct containing severaladdresses.

Risk Information

Base Score

5.5

MODERATE

Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Score

Exploitation Probability

0.025

Associated Vulnerability

No records found

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234