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CVE-2025-39726— s390/ism: fix concurrency management in ism_cmd()

CVSS 9.8 · Critical EPSS 0.24% · P15

Possible ATT&CK Techniques 1AI

T1211 · Exploitation for Stealth

Affected Version Matrix 10

VendorProductVersion RangeStatus
LinuxLinux684b89bc39ce4f204b1a2b180f39f2eb36a6b695< faf44487dfc80817f178dc8de7a0b73f960d019baffected
684b89bc39ce4f204b1a2b180f39f2eb36a6b695< 1194ad0d44d66b273a02a3a22882dc863a68d764affected
684b89bc39ce4f204b1a2b180f39f2eb36a6b695< fafaa4982bedb5532f5952000f714a3e63023f40affected
684b89bc39ce4f204b1a2b180f39f2eb36a6b695< 897e8601b9cff1d054cdd53047f568b0e1995726affected
4.19affected
< 4.19unaffected
6.6.101≤ 6.6.*unaffected
6.12.41≤ 6.12.*unaffected
… +2 more rows
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I. Basic Information for CVE-2025-39726

Vulnerability Information
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Vulnerability Title
s390/ism: fix concurrency management in ism_cmd()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/ism: fix concurrency management in ism_cmd() The s390x ISM device data sheet clearly states that only one request-response sequence is allowable per ISM function at any point in time. Unfortunately as of today the s390/ism driver in Linux does not honor that requirement. This patch aims to rectify that. This problem was discovered based on Aliaksei's bug report which states that for certain workloads the ISM functions end up entering error state (with PEC 2 as seen from the logs) after a while and as a consequence connections handled by the respective function break, and for future connection requests the ISM device is not considered -- given it is in a dysfunctional state. During further debugging PEC 3A was observed as well. A kernel message like [ 1211.244319] zpci: 061a:00:00.0: Event 0x2 reports an error for PCI function 0x61a is a reliable indicator of the stated function entering error state with PEC 2. Let me also point out that a kernel message like [ 1211.244325] zpci: 061a:00:00.0: The ism driver bound to the device does not support error recovery is a reliable indicator that the ISM function won't be auto-recovered because the ISM driver currently lacks support for it. On a technical level, without this synchronization, commands (inputs to the FW) may be partially or fully overwritten (corrupted) by another CPU trying to issue commands on the same function. There is hard evidence that this can lead to DMB token values being used as DMB IOVAs, leading to PEC 2 PCI events indicating invalid DMA. But this is only one of the failure modes imaginable. In theory even completely losing one command and executing another one twice and then trying to interpret the outputs as if the command we intended to execute was actually executed and not the other one is also possible. Frankly, I don't feel confident about providing an exhaustive list of possible consequences.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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，该漏洞源于并发管理不当，可能导致设备进入错误状态。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 ~ faf44487dfc80817f178dc8de7a0b73f960d019b -
LinuxLinux 4.19 -

II. Public POCs for CVE-2025-39726

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III. Intelligence Information for CVE-2025-39726

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

CVE-2025-387349.8 CRITICALnet/smc: fix UAF on smcsk after smc_listen_out()
CVE-2025-396829.8 CRITICALtls: fix handling of zero-length records on the rx_list
CVE-2025-387379.8 CRITICALcifs: Fix oops due to uninitialised variable
CVE-2025-396739.8 CRITICALppp: fix race conditions in ppp_fill_forward_path
CVE-2025-397039.8 CRITICALnet, hsr: reject HSR frame if skb can't hold tag
CVE-2025-397029.8 CRITICALipv6: sr: Fix MAC comparison to be constant-time
CVE-2025-397048.8 HIGHLoongArch: KVM: Fix stack protector issue in send_ipi_data()
CVE-2025-397188.4 HIGHvsock/virtio: Validate length in packet header before skb_put()
CVE-2025-396807.8 HIGHi2c: rtl9300: Fix out-of-bounds bug in rtl9300_i2c_smbus_xfer
CVE-2025-396977.8 HIGHNFS: Fix a race when updating an existing write
CVE-2025-396777.8 HIGHnet/sched: Fix backlog accounting in qdisc_dequeue_internal
CVE-2025-396837.8 HIGHtracing: Limit access to parser->buffer when trace_get_user failed
CVE-2025-397177.8 HIGHopen_tree_attr: do not allow id-mapping changes without OPEN_TREE_CLONE
CVE-2025-397147.8 HIGHmedia: usbtv: Lock resolution while streaming
CVE-2025-396897.8 HIGHftrace: Also allocate and copy hash for reading of filter files
CVE-2025-396917.8 HIGHfs/buffer: fix use-after-free when call bh_read() helper
CVE-2025-396987.8 HIGHio_uring/futex: ensure io_futex_wait() cleans up properly on failure
CVE-2025-397117.8 HIGHmedia: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls
CVE-2025-397107.8 HIGHmedia: venus: Add a check for packet size after reading from shared memory
CVE-2025-396967.8 HIGHALSA: hda: tas2781: Fix wrong reference of tasdevice_priv

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

IV. Related Vulnerabilities

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Same vendor: Linux

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