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CVE-2026-23112— nvmet-tcp: add bounds checks in nvmet_tcp_build_pdu_iovec

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nvmet_tcp_build_pdu_iovec函数中缺少边界检查，可能导致使用无效的sg值并引发通用保护故障或KASAN错误。

CVSS 9.8 · Critical EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 872d26a391da92ed8f0c0f5cb5fef428067b7f30< 0b9981751be14b59b4473383c731c833738aebdb affected
872d26a391da92ed8f0c0f5cb5fef428067b7f30< 42afe8ed8ad2de9c19457156244ef3e1eca94b5d affected
872d26a391da92ed8f0c0f5cb5fef428067b7f30< 1385be357e8acd09b36e026567f3a9d5c61139de affected
872d26a391da92ed8f0c0f5cb5fef428067b7f30< dca1a6ba0da9f472ef040525fab10fd9956db59f affected
872d26a391da92ed8f0c0f5cb5fef428067b7f30< 19672ae68d52ff75347ebe2420dde1b07adca09f affected
872d26a391da92ed8f0c0f5cb5fef428067b7f30< ab200d71553bdcf4de554a5985b05b2dd606bc57 affected
872d26a391da92ed8f0c0f5cb5fef428067b7f30< 52a0a98549344ca20ad81a4176d68d28e3c05a5c affected
5.0 affected
… +8 more rows
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I. Basic Information for CVE-2026-23112

Vulnerability Information
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Vulnerability Title
nvmet-tcp: add bounds checks in nvmet_tcp_build_pdu_iovec
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: add bounds checks in nvmet_tcp_build_pdu_iovec nvmet_tcp_build_pdu_iovec() could walk past cmd->req.sg when a PDU length or offset exceeds sg_cnt and then use bogus sg->length/offset values, leading to _copy_to_iter() GPF/KASAN. Guard sg_idx, remaining entries, and sg->length/offset before building the bvec.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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nvmet_tcp_build_pdu_iovec函数中缺少边界检查，可能导致使用无效的sg值并引发通用保护故障或KASAN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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 872d26a391da92ed8f0c0f5cb5fef428067b7f30 ~ 0b9981751be14b59b4473383c731c833738aebdb -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-23112

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III. Intelligence Information for CVE-2026-23112

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Patches & Fixes for CVE-2026-23112 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23112

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