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CVE-2025-39694— s390/sclp: Fix SCCB present check

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s390/sclp模块在SCCB存在检查前未处理NULL情况。

CVSS 7.3 · High EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux ada1da31ce34248bc97ca8f801f2cf6efa378a81< aa5073ac1a2a274812f3b04c278992e68ff67cc7 affected
ada1da31ce34248bc97ca8f801f2cf6efa378a81< 86c2825791c3836a8f77a954b9c5ebe6fab410c5 affected
ada1da31ce34248bc97ca8f801f2cf6efa378a81< 61605c847599fbfdfafe638607841c7d73719081 affected
ada1da31ce34248bc97ca8f801f2cf6efa378a81< bf83ae3537359af088d6577812ed93113dfbcb7b affected
ada1da31ce34248bc97ca8f801f2cf6efa378a81< 430fa71027b6ac9bb0ce5532b8d0676777d4219a affected
5.16 affected
< 5.16 unaffected
6.1.149≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-39694

Vulnerability Information
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Vulnerability Title
s390/sclp: Fix SCCB present check
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/sclp: Fix SCCB present check Tracing code called by the SCLP interrupt handler contains early exits if the SCCB address associated with an interrupt is NULL. This check is performed after physical to virtual address translation. If the kernel identity mapping does not start at address zero, the resulting virtual address is never zero, so that the NULL checks won't work. Subsequently this may result in incorrect accesses to the first page of the identity mapping. Fix this by introducing a function that handles the NULL case before address translation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/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s390/sclp模块在SCCB存在检查前未处理NULL情况。
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 ada1da31ce34248bc97ca8f801f2cf6efa378a81 ~ aa5073ac1a2a274812f3b04c278992e68ff67cc7 -
Linux Linux 5.16 -

II. Public POCs for CVE-2025-39694

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III. Intelligence Information for CVE-2025-39694

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Same Patch Batch · Linux · 2025-09-05 · 60 CVEs total

CVE-2025-39726 9.8 CRITICAL s390/ism: fix concurrency management in ism_cmd()
CVE-2025-39682 9.8 CRITICAL tls: fix handling of zero-length records on the rx_list
CVE-2025-38734 9.8 CRITICAL net/smc: fix UAF on smcsk after smc_listen_out()
CVE-2025-39702 9.8 CRITICAL ipv6: sr: Fix MAC comparison to be constant-time
CVE-2025-39703 9.8 CRITICAL net, hsr: reject HSR frame if skb can't hold tag
CVE-2025-38737 9.8 CRITICAL cifs: Fix oops due to uninitialised variable
CVE-2025-39673 9.8 CRITICAL ppp: fix race conditions in ppp_fill_forward_path
CVE-2025-39704 8.8 HIGH LoongArch: KVM: Fix stack protector issue in send_ipi_data()
CVE-2025-39718 8.4 HIGH vsock/virtio: Validate length in packet header before skb_put()
CVE-2025-39711 7.8 HIGH media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls
CVE-2025-39710 7.8 HIGH media: venus: Add a check for packet size after reading from shared memory
CVE-2025-39697 7.8 HIGH NFS: Fix a race when updating an existing write
CVE-2025-39714 7.8 HIGH media: usbtv: Lock resolution while streaming
CVE-2025-39717 7.8 HIGH open_tree_attr: do not allow id-mapping changes without OPEN_TREE_CLONE
CVE-2025-39698 7.8 HIGH io_uring/futex: ensure io_futex_wait() cleans up properly on failure
CVE-2025-38731 7.8 HIGH drm/xe: Fix vm_bind_ioctl double free bug
CVE-2025-39696 7.8 HIGH ALSA: hda: tas2781: Fix wrong reference of tasdevice_priv
CVE-2025-39691 7.8 HIGH fs/buffer: fix use-after-free when call bh_read() helper
CVE-2025-39689 7.8 HIGH ftrace: Also allocate and copy hash for reading of filter files
CVE-2025-38733 7.8 HIGH s390/mm: Do not map lowcore with identity mapping

Showing top 20 of 60 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39694

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