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CVE-2026-80708— s390/zcrypt: Fix missing mem scrub at clear key import in cca_clr2cipherkey()

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 5.4版本存在安全漏洞，该漏洞源于内部缓冲区使用后未进行内存清理，可能导致明文密钥材料残留内存并被泄露。

AI Predicted 4.3 Difficulty: Hard EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1646

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 8e1c0def77b7450be0ed607ed0d7bae629d30020 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< be7ae07fb745d1cf575b03a178a055b0a2859364 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 4e26d0d72bfdec311f12acfa0c6b7fbeb6a343d3 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 7dd6e556dbfc91d3d511cfd1015d2dad42608010 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< b453003ae6a869f5bdf025b5519cbb38295ae4f1 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< fbb0410986e8ad214121e51a4a28c3d0a10b7644 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< ebfbb9ac7adbb1e3556100b54a27e8a9b102feac affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 01476391aecef36a3b789ee844357b22fbc90665 affected
… +10 more rows
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I. Basic Information for CVE-2026-80708

Vulnerability Information
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Vulnerability Title
s390/zcrypt: Fix missing mem scrub at clear key import in cca_clr2cipherkey()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Fix missing mem scrub at clear key import in cca_clr2cipherkey() The helper function _ip_cprb_helper() uses internal buffer memory for building and processing CPRBs. After use this buffer was never scrubbed which could lead to leaving for example clear key material in memory which could be exposed via tricky reuse of this same memory. Extend the _ip_cprb_helper() function with another parameter 'scrub' used to steer scrubbing of this buffer. So now the caller has the opportunity to decide if scrubbing is needed or not. Extend the clear key to secure key token import process in function cca_clr2cipherkey() to tell the helper function from above to scrub the cprb buffer when the clear key value is part of the request data. Add explicit scrubbing on return from function cca_clr2cipherkey() for the random EXOR buffer and the cprb buffer. Overall this cleans the internal used buffer in case of clear key import to prevent sensitive data to get exposed.
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 5.4版本存在安全漏洞，该漏洞源于内部缓冲区使用后未进行内存清理，可能导致明文密钥材料残留内存并被泄露。
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 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd ~ 8e1c0def77b7450be0ed607ed0d7bae629d30020 -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-80708

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III. Intelligence Information for CVE-2026-80708

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Patches & Fixes for CVE-2026-80708 (8)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80681 9.8 CRITICAL vxlan: re-fetch eth header after route_shortcircuit()
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80721 8.8 HIGH Bluetooth: ISO: ensure no dangling hcon references in iso_conn
CVE-2026-80722 8.8 HIGH wifi: mac80211: validate individual TWT params before driver setup
CVE-2026-80724 8.8 HIGH ptp: vmclock: prevent read-only mappings from becoming writable

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80708

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