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CVE-2025-40126— sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于异常处理计算错误，可能导致内存访问错误。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada< 0bf3dc3a2156f1c5ddaba4b85d09767874634114 affected
cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada< 41c18baee66134e6ef786eb075c1b6adb22432b0 affected
cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada< 59424dc0d0e044b2eb007686a4724ddd91d57db5 affected
cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada< 9b137f277cc3297044aabd950f589e505d30104c affected
cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada< 674ff598148a28bae0b5372339de56f2abf0b1d1 affected
cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada< 7de3a75bbc8465d816336c74d50109e73501efab affected
cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada< 57c278500fce3cd4e1c540700c0b05426a958393 affected
cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada< 4fba1713001195e59cfc001ff1f2837dab877efb affected
… +14 more rows
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I. Basic Information for CVE-2025-40126

Vulnerability Information
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Vulnerability Title
sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. This commit fixes a couple of bad calculations. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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，该漏洞源于异常处理计算错误，可能导致内存访问错误。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada ~ 0bf3dc3a2156f1c5ddaba4b85d09767874634114 -
Linux Linux 4.9 -

II. Public POCs for CVE-2025-40126

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III. Intelligence Information for CVE-2025-40126

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Patches & Fixes for CVE-2025-40126 (2)

Same Patch Batch · Linux · 2025-11-12 · 96 CVEs total

CVE-2025-40176 9.8 CRITICAL tls: wait for pending async decryptions if tls_strp_msg_hold fails
CVE-2025-40140 8.8 HIGH net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast
CVE-2025-40133 8.1 HIGH mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().
CVE-2025-40186 8.1 HIGH tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().
CVE-2025-40158 8.1 HIGH ipv6: use RCU in ip6_output()
CVE-2025-40204 8.1 HIGH sctp: Fix MAC comparison to be constant-time
CVE-2025-40135 8.1 HIGH ipv6: use RCU in ip6_xmit()
CVE-2025-40168 8.1 HIGH smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().
CVE-2025-40141 8.0 HIGH Bluetooth: ISO: Fix possible UAF on iso_conn_free
CVE-2025-40166 7.8 HIGH drm/xe/guc: Check GuC running state before deregistering exec queue
CVE-2025-40159 7.8 HIGH xsk: Harden userspace-supplied xdp_desc validation
CVE-2025-40173 7.8 HIGH net/ip6_tunnel: Prevent perpetual tunnel growth
CVE-2025-40167 7.8 HIGH ext4: detect invalid INLINE_DATA + EXTENTS flag combination
CVE-2025-40170 7.8 HIGH net: use dst_dev_rcu() in sk_setup_caps()
CVE-2025-40172 7.8 HIGH accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()
CVE-2025-40149 7.8 HIGH tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().
CVE-2025-40174 7.8 HIGH x86/mm: Fix SMP ordering in switch_mm_irqs_off()
CVE-2025-40139 7.8 HIGH smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set().
CVE-2025-40190 7.8 HIGH ext4: guard against EA inode refcount underflow in xattr update
CVE-2025-40151 7.8 HIGH LoongArch: BPF: No support of struct argument in trampoline programs

Showing top 20 of 96 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40126

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