CVE-2025-40189— net: usb: lan78xx: Fix lost EEPROM read timeout error(-ETIMEDOUT) in lan78xx_read_raw_eeprom
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I. Basic Information for CVE-2025-40189
Vulnerability Information
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Vulnerability Title
net: usb: lan78xx: Fix lost EEPROM read timeout error(-ETIMEDOUT) in lan78xx_read_raw_eeprom
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: usb: lan78xx: Fix lost EEPROM read timeout error(-ETIMEDOUT) in lan78xx_read_raw_eeprom Syzbot reported read of uninitialized variable BUG with following call stack. lan78xx 8-1:1.0 (unnamed net_device) (uninitialized): EEPROM read operation timeout ===================================================== BUG: KMSAN: uninit-value in lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1095 [inline] BUG: KMSAN: uninit-value in lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline] BUG: KMSAN: uninit-value in lan78xx_reset+0x999/0x2cd0 drivers/net/usb/lan78xx.c:3241 lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1095 [inline] lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline] lan78xx_reset+0x999/0x2cd0 drivers/net/usb/lan78xx.c:3241 lan78xx_bind+0x711/0x1690 drivers/net/usb/lan78xx.c:3766 lan78xx_probe+0x225c/0x3310 drivers/net/usb/lan78xx.c:4707 Local variable sig.i.i created at: lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1092 [inline] lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline] lan78xx_reset+0x77e/0x2cd0 drivers/net/usb/lan78xx.c:3241 lan78xx_bind+0x711/0x1690 drivers/net/usb/lan78xx.c:3766 The function lan78xx_read_raw_eeprom failed to properly propagate EEPROM read timeout errors (-ETIMEDOUT). In the fallthrough path, it first attempted to restore the pin configuration for LED outputs and then returned only the status of that restore operation, discarding the original timeout error. As a result, callers could mistakenly treat the data buffer as valid even though the EEPROM read had actually timed out with no data or partial data. To fix this, handle errors in restoring the LED pin configuration separately. If the restore succeeds, return any prior EEPROM timeout error correctly to the caller.
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，该漏洞源于未初始化变量读取，可能导致内核BUG。
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-2025-40189
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Same Patch Batch · Linux · 2025-11-12 · 96 CVEs total
| CVE-2025-40175 | idpf: cleanup remaining SKBs in PTP flows | |
| CVE-2025-40170 | net: use dst_dev_rcu() in sk_setup_caps() | |
| CVE-2025-40171 | nvmet-fc: move lsop put work to nvmet_fc_ls_req_op | |
| CVE-2025-40167 | ext4: detect invalid INLINE_DATA + EXTENTS flag combination | |
| CVE-2025-40164 | usbnet: Fix using smp_processor_id() in preemptible code warnings | |
| CVE-2025-40162 | ASoC: amd/sdw_utils: avoid NULL deref when devm_kasprintf() fails | |
| CVE-2025-40163 | sched/deadline: Stop dl_server before CPU goes offline | |
| CVE-2025-40161 | mailbox: zynqmp-ipi: Fix SGI cleanup on unbind | |
| CVE-2025-40166 | drm/xe/guc: Check GuC running state before deregistering exec queue | |
| CVE-2025-40174 | x86/mm: Fix SMP ordering in switch_mm_irqs_off() | |
| CVE-2025-40172 | accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages() | |
| CVE-2025-40176 | tls: wait for pending async decryptions if tls_strp_msg_hold fails | |
| CVE-2025-40173 | net/ip6_tunnel: Prevent perpetual tunnel growth | |
| CVE-2025-40177 | accel/qaic: Fix bootlog initialization ordering | |
| CVE-2025-40178 | pid: Add a judgment for ns null in pid_nr_ns | |
| CVE-2025-40179 | ext4: verify orphan file size is not too big | |
| CVE-2025-40180 | mailbox: zynqmp-ipi: Fix out-of-bounds access in mailbox cleanup loop | |
| CVE-2025-40181 | x86/kvm: Force legacy PCI hole to UC when overriding MTRRs for TDX/SNP | |
| CVE-2025-40183 | bpf: Fix metadata_dst leak __bpf_redirect_neigh_v{4,6} | |
| CVE-2025-40182 | crypto: skcipher - Fix reqsize handling |
Showing top 20 of 96 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
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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
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
V. Comments for CVE-2025-40189
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