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CVE-2026-80791— nvmet-auth: zero the AUTH_RECEIVE response buffer

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存在安全漏洞，该漏洞源于nvmet_execute_auth_receive()函数使用kmalloc()按主机提供的AUTH_RECEIVE分配长度分配响应缓冲区，但DH-HMAC-CHAP构建器仅写入固定大小消息，导致未初始化内存被复制到线路，远程发起者在预认证握手期间可获取最多接近一页的未初始化slab内存，造成信息泄露。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux db1312dd95488b5e6ff362ff66fcf953a46b1821< 447b668faa14710f611e714031e3739ac3ec3a4f affected
db1312dd95488b5e6ff362ff66fcf953a46b1821< 8f6363c8d54dde95982f0ab45e77cf57ec0efd62 affected
db1312dd95488b5e6ff362ff66fcf953a46b1821< dfcf013f77709ebdb282767edc2795a37cab5b57 affected
db1312dd95488b5e6ff362ff66fcf953a46b1821< b26189d28442183a8b5edb754f4a6918f77ca84e affected
db1312dd95488b5e6ff362ff66fcf953a46b1821< 2dcc9226203da7275a9c29d20007da278d73d5e9 affected
db1312dd95488b5e6ff362ff66fcf953a46b1821< 1d6837d98bf966a041af65de5f78de7409ff83bc affected
db1312dd95488b5e6ff362ff66fcf953a46b1821< 3ddcfb013322aa37eaa7a0d344b73079c38dfa21 affected
6.0 affected
… +8 more rows
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I. Basic Information for CVE-2026-80791

Vulnerability Information
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Vulnerability Title
nvmet-auth: zero the AUTH_RECEIVE response buffer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: zero the AUTH_RECEIVE response buffer nvmet_execute_auth_receive() allocates the response buffer with kmalloc() sized by the host-supplied AUTH_RECEIVE allocation length, but the DH-HMAC-CHAP builders write only a fixed-size message into it. The full allocation length is then copied to the wire by nvmet_copy_to_sgl(), so a remote initiator receives the bytes past the built message -- up to nearly a page of uninitialized slab -- during the pre-authentication handshake. Allocate the buffer with kzalloc() so the unwritten tail is zeroed before it is sent; conforming responses are unaffected.
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存在安全漏洞，该漏洞源于nvmet_execute_auth_receive()函数使用kmalloc()按主机提供的AUTH_RECEIVE分配长度分配响应缓冲区，但DH-HMAC-CHAP构建器仅写入固定大小消息，导致未初始化内存被复制到线路，远程发起者在预认证握手期间可获取最多接近一页的未初始化slab内存，造成信息泄露。
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 db1312dd95488b5e6ff362ff66fcf953a46b1821 ~ 447b668faa14710f611e714031e3739ac3ec3a4f -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-80791

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III. Intelligence Information for CVE-2026-80791

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Patches & Fixes for CVE-2026-80791 (7)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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