CVE-2025-38440— net/mlx5e: Fix race between DIM disable and net_dim()
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I. Basic Information for CVE-2025-38440
Vulnerability Information
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Vulnerability Title
net/mlx5e: Fix race between DIM disable and net_dim()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix race between DIM disable and net_dim() There's a race between disabling DIM and NAPI callbacks using the dim pointer on the RQ or SQ. If NAPI checks the DIM state bit and sees it still set, it assumes `rq->dim` or `sq->dim` is valid. But if DIM gets disabled right after that check, the pointer might already be set to NULL, leading to a NULL pointer dereference in net_dim(). Fix this by calling `synchronize_net()` before freeing the DIM context. This ensures all in-progress NAPI callbacks are finished before the pointer is cleared. Kernel log: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:net_dim+0x23/0x190 ... Call Trace: <TASK> ? __die+0x20/0x60 ? page_fault_oops+0x150/0x3e0 ? common_interrupt+0xf/0xa0 ? sysvec_call_function_single+0xb/0x90 ? exc_page_fault+0x74/0x130 ? asm_exc_page_fault+0x22/0x30 ? net_dim+0x23/0x190 ? mlx5e_poll_ico_cq+0x41/0x6f0 [mlx5_core] ? sysvec_apic_timer_interrupt+0xb/0x90 mlx5e_handle_rx_dim+0x92/0xd0 [mlx5_core] mlx5e_napi_poll+0x2cd/0xac0 [mlx5_core] ? mlx5e_poll_ico_cq+0xe5/0x6f0 [mlx5_core] busy_poll_stop+0xa2/0x200 ? mlx5e_napi_poll+0x1d9/0xac0 [mlx5_core] ? mlx5e_trigger_irq+0x130/0x130 [mlx5_core] __napi_busy_loop+0x345/0x3b0 ? sysvec_call_function_single+0xb/0x90 ? asm_sysvec_call_function_single+0x16/0x20 ? sysvec_apic_timer_interrupt+0xb/0x90 ? pcpu_free_area+0x1e4/0x2e0 napi_busy_loop+0x11/0x20 xsk_recvmsg+0x10c/0x130 sock_recvmsg+0x44/0x70 __sys_recvfrom+0xbc/0x130 ? __schedule+0x398/0x890 __x64_sys_recvfrom+0x20/0x30 do_syscall_64+0x4c/0x100 entry_SYSCALL_64_after_hwframe+0x4b/0x53 ... ---[ end trace 0000000000000000 ]--- ... ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于DIM禁用与net_dim之间的竞争条件，可能导致空指针解引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-38440
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Same Patch Batch · Linux · 2025-07-25 · 114 CVEs total
| CVE-2025-38424 | perf: Fix sample vs do_exit() | |
| CVE-2025-38438 | ASoC: SOF: Intel: hda: Use devm_kstrdup() to avoid memleak. | |
| CVE-2025-38437 | ksmbd: fix potential use-after-free in oplock/lease break ack | |
| CVE-2025-38436 | drm/scheduler: signal scheduled fence when kill job | |
| CVE-2025-38435 | riscv: vector: Fix context save/restore with xtheadvector | |
| CVE-2025-38434 | Revert "riscv: Define TASK_SIZE_MAX for __access_ok()" | |
| CVE-2025-38433 | riscv: fix runtime constant support for nommu kernels | |
| CVE-2025-38432 | net: netpoll: Initialize UDP checksum field before checksumming | |
| CVE-2025-38431 | smb: client: fix regression with native SMB symlinks | |
| CVE-2025-38430 | nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request | |
| CVE-2025-38429 | bus: mhi: ep: Update read pointer only after buffer is written | |
| CVE-2025-38428 | Input: ims-pcu - check record size in ims_pcu_flash_firmware() | |
| CVE-2025-38427 | video: screen_info: Relocate framebuffers behind PCI bridges | |
| CVE-2025-38425 | i2c: tegra: check msg length in SMBUS block read | |
| CVE-2025-38426 | drm/amdgpu: Add basic validation for RAS header | |
| CVE-2025-38413 | virtio-net: xsk: rx: fix the frame's length check | |
| CVE-2025-38416 | NFC: nci: uart: Set tty->disc_data only in success path | |
| CVE-2025-38415 | Squashfs: check return result of sb_min_blocksize | |
| CVE-2025-38414 | wifi: ath12k: fix GCC_GCC_PCIE_HOT_RST definition for WCN7850 | |
| CVE-2025-38417 | ice: fix eswitch code memory leak in reset scenario |
Showing top 20 of 114 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
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