CVE-2025-40255— net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()
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I. Basic Information for CVE-2025-40255
Vulnerability Information
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Vulnerability Title
net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower() The ethtool tsconfig Netlink path can trigger a null pointer dereference. A call chain such as: tsconfig_prepare_data() -> dev_get_hwtstamp_phylib() -> vlan_hwtstamp_get() -> generic_hwtstamp_get_lower() -> generic_hwtstamp_ioctl_lower() results in generic_hwtstamp_ioctl_lower() being called with kernel_cfg->ifr as NULL. The generic_hwtstamp_ioctl_lower() function does not expect a NULL ifr and dereferences it, leading to a system crash. Fix this by adding a NULL check for kernel_cfg->ifr in generic_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL.
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，该漏洞源于未检查NULL指针，可能导致空指针取消引用。
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-2025-40255
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Same Patch Batch · Linux · 2025-12-04 · 53 CVEs total
| CVE-2025-40229 | mm/damon/core: fix potential memory leak by cleaning ops_filter in damon_destroy_scheme | |
| CVE-2025-40214 | af_unix: Initialise scc_index in unix_add_edge(). | |
| CVE-2025-40215 | xfrm: delete x->tunnel as we delete x | |
| CVE-2025-40220 | fuse: fix livelock in synchronous file put from fuseblk workers | |
| CVE-2025-40217 | pidfs: validate extensible ioctls | |
| CVE-2025-40218 | mm/damon/vaddr: do not repeat pte_offset_map_lock() until success | |
| CVE-2025-40219 | PCI/IOV: Fix race between SR-IOV enable/disable and hotplug | |
| CVE-2025-40216 | io_uring/rsrc: don't rely on user vaddr alignment | |
| CVE-2025-40227 | mm/damon/sysfs: dealloc commit test ctx always | |
| CVE-2025-40228 | mm/damon/sysfs: catch commit test ctx alloc failure | |
| CVE-2025-40226 | firmware: arm_scmi: Account for failed debug initialization | |
| CVE-2025-40230 | mm: prevent poison consumption when splitting THP | |
| CVE-2025-40231 | vsock: fix lock inversion in vsock_assign_transport() | |
| CVE-2025-40232 | rv: Fully convert enabled_monitors to use list_head as iterator | |
| CVE-2025-40233 | ocfs2: clear extent cache after moving/defragmenting extents | |
| CVE-2025-40234 | platform/x86: alienware-wmi-wmax: Fix NULL pointer dereference in sleep handlers | |
| CVE-2025-40236 | virtio-net: zero unused hash fields | |
| CVE-2025-40235 | btrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots() | |
| CVE-2025-40237 | fs/notify: call exportfs_encode_fid with s_umount | |
| CVE-2025-40238 | net/mlx5: Fix IPsec cleanup over MPV device |
Showing top 20 of 53 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
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unshare: fix unshare_fs() handling
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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