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CVE-2025-40124— sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III

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。

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux ee841d0aff649164080e445e84885015958d8ff4< fdd43fe6d286f27b826572457a89c926f97e2d3a affected
ee841d0aff649164080e445e84885015958d8ff4< 1198077606aeffb102587c6ea079ce99641c99d4 affected
ee841d0aff649164080e445e84885015958d8ff4< 1857cdca12c4aff58bf26a7005a4d02850c29927 affected
ee841d0aff649164080e445e84885015958d8ff4< 91eda032eb16e5d2be27c95584665bc555bb5a90 affected
ee841d0aff649164080e445e84885015958d8ff4< dc766c4830a7e1e1ee9d7f77d4ab344f2eb23c8e affected
ee841d0aff649164080e445e84885015958d8ff4< 5ef9c94d7110e90260c06868cf1dcf899b9f25ee affected
ee841d0aff649164080e445e84885015958d8ff4< e50377c6b3f278c9f3ef017ffce17f5fcc9dace4 affected
ee841d0aff649164080e445e84885015958d8ff4< 47b49c06eb62504075f0f2e2227aee2e2c2a58b3 affected
… +14 more rows
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I. Basic Information for CVE-2025-40124

Vulnerability Information
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Vulnerability Title
sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III
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 III Anthony Yznaga tracked down that a BUG_ON in ext4 code with large folios enabled resulted from copy_from_user() returning impossibly large values greater than the size to be copied. This lead to __copy_from_iter() returning impossible values instead of the actual number of bytes it was able to copy. The BUG_ON has been reported in https://lore.kernel.org/r/b14f55642207e63e907965e209f6323a0df6dcee.camel@physik.fu-berlin.de 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. The exception handlers expect that %o2 has already been masked during the bulk copy loop, but the masking was performed after that loop. 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
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 ee841d0aff649164080e445e84885015958d8ff4 ~ fdd43fe6d286f27b826572457a89c926f97e2d3a -
Linux Linux 4.9 -

II. Public POCs for CVE-2025-40124

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III. Intelligence Information for CVE-2025-40124

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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-2025-40135 8.1 HIGH ipv6: use RCU in ip6_xmit()
CVE-2025-40158 8.1 HIGH ipv6: use RCU in ip6_output()
CVE-2025-40186 8.1 HIGH tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().
CVE-2025-40204 8.1 HIGH sctp: Fix MAC comparison to be constant-time
CVE-2025-40133 8.1 HIGH mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().
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-2025-40149 7.8 HIGH tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().
CVE-2025-40190 7.8 HIGH ext4: guard against EA inode refcount underflow in xattr update
CVE-2025-40139 7.8 HIGH smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set().
CVE-2025-40151 7.8 HIGH LoongArch: BPF: No support of struct argument in trampoline programs
CVE-2025-40159 7.8 HIGH xsk: Harden userspace-supplied xdp_desc validation
CVE-2025-40165 7.8 HIGH media: nxp: imx8-isi: m2m: Fix streaming cleanup on release
CVE-2025-40174 7.8 HIGH x86/mm: Fix SMP ordering in switch_mm_irqs_off()
CVE-2025-40172 7.8 HIGH accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()
CVE-2025-40170 7.8 HIGH net: use dst_dev_rcu() in sk_setup_caps()
CVE-2025-40169 7.8 HIGH bpf: Reject negative offsets for ALU ops
CVE-2025-40167 7.8 HIGH ext4: detect invalid INLINE_DATA + EXTENTS flag combination

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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