CVE-2026-23112
Modified Modified - Updated After Analysis

Out-of-Bounds Read in Linux nvmet-tcp Causes Kernel Crash

Publication date: 2026-02-13

Last updated on: 2026-06-02

Assigner: kernel.org

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.

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Meta Information

Published
2026-02-13
Last Modified
2026-06-02
Generated
2026-07-06
AI Q&A
2026-02-13
EPSS Evaluated
2026-07-05
NVD
CVE-2026-23112
EUVD
EUVD-2026-6171

Affected Vendors & Products

Showing 14 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.16 (inc) to 6.1.163 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.70 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.124 (exc)
linux linux_kernel 6.19
linux linux_kernel From 6.13 (inc) to 6.18.10 (exc)
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.0 (inc) to 5.10.250 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.200 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This vulnerability exists in the Linux kernel's nvmet-tcp component, specifically in the function nvmet_tcp_build_pdu_iovec(). The function could read beyond the bounds of the cmd->req.sg array when a Protocol Data Unit (PDU) length or offset exceeds the number of scatter-gather entries (sg_cnt). This out-of-bounds access could cause the function to use invalid scatter-gather length or offset values, potentially leading to a general protection fault (GPF) or Kernel Address Sanitizer (KASAN) error during a memory copy operation (_copy_to_iter()).

Impact Analysis

The impact of this vulnerability could include system crashes or kernel faults due to invalid memory access. This could lead to denial of service conditions where the affected Linux system becomes unstable or unresponsive. Additionally, such faults might be exploitable to cause further security issues, although specific exploitability details are not provided.

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