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CVE-2025-37879— 9p/net: fix improper handling of bogus negative read/write replies

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，该漏洞源于未正确处理负数的读写回复，可能导致整数溢出。

CVSS 9.8 · Critical EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 070b3656cf228eaaef7b28b59264c5c7cdbdd0fb< 468ff4a7c61fb811c596a7c44b6a5455e40fd12b affected
070b3656cf228eaaef7b28b59264c5c7cdbdd0fb< a68768e280b7d0c967ea509e791bb9b90adc94a5 affected
070b3656cf228eaaef7b28b59264c5c7cdbdd0fb< c548f95688e2b5ae0e2ae43d53cf717156c7d034 affected
070b3656cf228eaaef7b28b59264c5c7cdbdd0fb< 374e4cd75617c8c2552f562f39dd989583f5c330 affected
070b3656cf228eaaef7b28b59264c5c7cdbdd0fb< d0259a856afca31d699b706ed5e2adf11086c73b affected
4.1 affected
< 4.1 unaffected
6.1.136≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-37879

Vulnerability Information
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Vulnerability Title
9p/net: fix improper handling of bogus negative read/write replies
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the server incorrectly replies with success but a negative write/read count then we would consider written (negative) <= rsize (positive) because both variables were signed. Make variables unsigned to avoid this problem. The reproducer linked below now fails with the following error instead of a null pointer deref: 9pnet: bogus RWRITE count (4294967295 > 3)
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，该漏洞源于未正确处理负数的读写回复，可能导致整数溢出。
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 070b3656cf228eaaef7b28b59264c5c7cdbdd0fb ~ 468ff4a7c61fb811c596a7c44b6a5455e40fd12b -
Linux Linux 4.1 -

II. Public POCs for CVE-2025-37879

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III. Intelligence Information for CVE-2025-37879

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Same Patch Batch · Linux · 2025-05-09 · 52 CVEs total

CVE-2025-37885 8.8 HIGH KVM: x86: Reset IRTE to host control if *new* route isn't postable
CVE-2025-37849 8.8 HIGH KVM: arm64: Tear down vGIC on failed vCPU creation
CVE-2025-37886 7.8 HIGH pds_core: make wait_context part of q_info
CVE-2025-37869 7.8 HIGH drm/xe: Use local fence in error path of xe_migrate_clear
CVE-2025-37854 7.8 HIGH drm/amdkfd: Fix mode1 reset crash issue
CVE-2025-37845 7.8 HIGH tracing: fprobe events: Fix possible UAF on modules
CVE-2025-37882 7.8 HIGH usb: xhci: Fix isochronous Ring Underrun/Overrun event handling
CVE-2025-37861 7.8 HIGH scsi: mpi3mr: Synchronous access b/w reset and tm thread for reply queue
CVE-2025-37856 7.8 HIGH btrfs: harden block_group::bg_list against list_del() races
CVE-2025-37873 7.8 HIGH eth: bnxt: fix missing ring index trim on error path
CVE-2025-37871 7.5 HIGH nfsd: decrease sc_count directly if fail to queue dl_recall
CVE-2025-37887 7.1 HIGH pds_core: handle unsupported PDS_CORE_CMD_FW_CONTROL result
CVE-2025-37876 7.0 HIGH netfs: Only create /proc/fs/netfs with CONFIG_PROC_FS
CVE-2025-37883 s390/sclp: Add check for get_zeroed_page()
CVE-2025-37877 iommu: Clear iommu-dma ops on cleanup
CVE-2025-37888 net/mlx5: Fix null-ptr-deref in mlx5_create_{inner_,}ttc_table()
CVE-2025-37872 net: txgbe: fix memory leak in txgbe_probe() error path
CVE-2025-37870 drm/amd/display: prevent hang on link training fail
CVE-2025-37868 drm/xe/userptr: fix notifier vs folio deadlock
CVE-2025-37867 RDMA/core: Silence oversized kvmalloc() warning

Showing top 20 of 52 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37879

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