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CVE-2026-72025— s390/monwriter: Reject buffer reuse with different data length

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基金会开源的一个操作系统内核。 Linux kernel 5.10.261之前版本、5.15.212之前版本、6.1.178之前版本、6.6.145之前版本、6.12.97之前版本、6.18.40之前版本和7.1.5之前版本存在安全漏洞，该漏洞源于s390/monwriter对缓冲区重用未检查数据长度变化，可能导致越界复制到内核缓冲区，造成内存破坏。

AI Predicted 4.4 Difficulty: Hard EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 31b58088292c7f00f0b81088bfb557285b0b6247< 096dff1247037d329c04b3a5be0ecdfb1c5c7ac6 affected
31b58088292c7f00f0b81088bfb557285b0b6247< d39cf4a6d721b1ae21eb53bbf3e8cd984253d7ab affected
31b58088292c7f00f0b81088bfb557285b0b6247< 759d91378203ea35fa9bca6726dcf0010de081fb affected
31b58088292c7f00f0b81088bfb557285b0b6247< 036bc5661060702e798d215e81bb46da530965b3 affected
31b58088292c7f00f0b81088bfb557285b0b6247< 01f3ce411711c2c919598ea25320a5a48f71edbc affected
31b58088292c7f00f0b81088bfb557285b0b6247< f0745496f7c171271cafd9457df3b914a483ddeb affected
31b58088292c7f00f0b81088bfb557285b0b6247< ae5347f3db1782c6118f6cc0d9fd8b1d43397db3 affected
31b58088292c7f00f0b81088bfb557285b0b6247< 2995ccec260caa9e85b3301a4aba1e66ed80ad74 affected
… +10 more rows
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I. Basic Information for CVE-2026-72025

Vulnerability Information
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Vulnerability Title
s390/monwriter: Reject buffer reuse with different data length
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/monwriter: Reject buffer reuse with different data length When data buffers are reused, e.g. for interval sample records, the first record determines the data length, and the size of the buffer for user copy. Current monwriter code does not check if the data length was changed for subsequent records, which also would never happen for valid user programs. However, a malicious user could change the data length, resulting in out of bounds user copy to the kernel buffer, and memory corruption. By default, the monwriter misc device is created with root-only permissions, so practical impact is typically low. Fix this by checking for changed data length and rejecting such records.
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基金会开源的一个操作系统内核。 Linux kernel 5.10.261之前版本、5.15.212之前版本、6.1.178之前版本、6.6.145之前版本、6.12.97之前版本、6.18.40之前版本和7.1.5之前版本存在安全漏洞，该漏洞源于s390/monwriter对缓冲区重用未检查数据长度变化，可能导致越界复制到内核缓冲区，造成内存破坏。
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 31b58088292c7f00f0b81088bfb557285b0b6247 ~ 096dff1247037d329c04b3a5be0ecdfb1c5c7ac6 -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2026-72025

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III. Intelligence Information for CVE-2026-72025

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Patches & Fixes for CVE-2026-72025 (7)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72381 9.8 CRITICAL ksmbd: fix use-after-free of fp->owner.name in durable handle owner check
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74406 9.8 CRITICAL vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
CVE-2026-72221 9.8 CRITICAL sunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-72139 9.8 CRITICAL tcp: defer md5sig_info kfree past RCU grace period in tcp_connect
CVE-2026-72137 9.8 CRITICAL xfrm: nat_keepalive: avoid double free on send error
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72130 9.8 CRITICAL nvmet-auth: reject short AUTH_RECEIVE buffers

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72025

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