# CVE-2025-40290: linux: In the Linux kernel, the following vulnerability has been resolved:  xsk: avoid data corruption on cq descriptor numb...

CVE-2025-40290 is fixed in linux on 1 platform by DEBIAN-CVE-2025-40290 (version 6.17.11-1), released December 8, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-40290
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 8, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  xsk: avoid data corruption on cq descriptor number  Since commit 30f241fcf52a ("xsk: Fix immature cq descriptor production"), the descriptor number is stored in skb control block and xsk_cq_submit_addr_locked() relies on it to put the umem addrs onto pool's completion queue.  skb control block shouldn't be used for this purpose as after transmit xsk doesn't have control over it and other subsystems could use it. This leads 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:   <IRQ>   ? 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   </IRQ>   <TASK>   __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   </TASK>  [...]  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 indicate whether this a single address or an allocated struct containing several addresses.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.17.11-1 | [DEBIAN-CVE-2025-40290](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40290.md) | Dec 8, 2025 |

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