Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-80543— s390/zcrypt: Pad trailing CCA or EP11 message with zeros

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.

在 Linux 内核中，已修复以下漏洞： s390/zcrypt：用零填充 CCA 或 EP11 消息的尾部 函数 和 均根据消息长度将用户空间的消息复制到内核缓冲区。但在后续处理中，消息要求按 4 字节长度对齐。因此，最多可能有 3 字节未初始化的内核内存被传递到后续处理步骤，从而可能将内核内存意外暴露给加密卡固件。 本补丁包含了代码，用于将用户空间复制的消息与发送至后续处理流程（针对 CCA 或 EP11 消息）的消息缓冲区长度之间的间隙用零填充。

AI Predicted 3.1 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1527

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux e2c6d91eb8b1533753755f07803e47eceed263d0< 2db92a56b000173d332b6c30f38a5a4444e4355a affected
e2c6d91eb8b1533753755f07803e47eceed263d0< eb363254472493e3458156fc11fd56dca92f4333 affected
7.1 affected
< 7.1 unaffected
7.1.10≤ 7.1.* unaffected
7.2≤ * unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-80543

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
s390/zcrypt: Pad trailing CCA or EP11 message with zeros
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Pad trailing CCA or EP11 message with zeros The both functions xcrb_msg_to_type6cprb_msgx() and xcrb_msg_to_type6_ep11cprb_msgx() copy the user space message into a kernel buffer based on the message length. But on further processing the message is supposed to be 4 byte length adjusted. Thus up to 3 bytes of uninitialized kernel memory are forwarded to further processing steps and may unwanted expose kernel memory to the crypto card firmware. This patch contains code to pad the gap between user space copied message and message buffer length sent down to further processing of the CCA or EP11 message to zeros.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e2c6d91eb8b1533753755f07803e47eceed263d0 ~ 2db92a56b000173d332b6c30f38a5a4444e4355a -
Linux Linux 7.1 -

II. Public POCs for CVE-2026-80543

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-80543

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-80543 (2)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80556 mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition
CVE-2026-80554 s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80548 s390/vfio_ccw: Selectively expand io_mutex
CVE-2026-80549 s390/vfio_ccw: Move cp cleanup out of not operational
CVE-2026-80546 s390/zcrypt: Improve CCA CPRB length and overflow checks
CVE-2026-80547 s390/vfio_ccw: Implement a crw lock
CVE-2026-80545 s390/zcrypt: Improve EP11 CPRB length and overflow checks
CVE-2026-80550 s390/vfio_ccw: Fix out of bounds check on CCW array
CVE-2026-80557 libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80555 s390/vfio_ccw: Free all memory if cp_init() fails
CVE-2026-80559 Input: sur40 - fix input device registration ordering
CVE-2026-80558 libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80560 openrisc: signal: do not restore privileged SR bits on sigreturn
CVE-2026-80561 libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80562 gpio: ml-ioh: use raw_spinlock_t for the register lock
CVE-2026-80563 gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind
CVE-2026-80564 gve: fix NULL dereference due to missing ptp adjfine
CVE-2026-80565 crypto: qce - fix error path in devm_qce_register_algs
CVE-2026-80566 Input: hynitron_cstxxx - validate touch count and finger IDs

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80543

No comments yet

Leave a comment