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CVE-2025-21993— iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()

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iscsi_ibft模块在处理IPv6子网掩码时产生负移位指数，触发UBSAN警告。

AI Predicted 4.4 Difficulty: Theoretical EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 138fe4e069798d9aa948a5402ff15e58f483ee4e< a858cd58dea06cf85b142673deea8c5d87f11e70 affected
138fe4e069798d9aa948a5402ff15e58f483ee4e< f763c82db8166e28f45b7cc4a5398a7859665940 affected
138fe4e069798d9aa948a5402ff15e58f483ee4e< b388e185bfad32bfed6a97a6817f74ca00a4318f affected
138fe4e069798d9aa948a5402ff15e58f483ee4e< 9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c affected
138fe4e069798d9aa948a5402ff15e58f483ee4e< 2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d affected
138fe4e069798d9aa948a5402ff15e58f483ee4e< b253660fac5e0e9080d2c95e3a029e1898d49afb affected
138fe4e069798d9aa948a5402ff15e58f483ee4e< c1c6e527470e5eab0b2d57bd073530fbace39eab affected
138fe4e069798d9aa948a5402ff15e58f483ee4e< 07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 affected
… +10 more rows
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I. Basic Information for CVE-2025-21993

Vulnerability Information
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Vulnerability Title
iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic() When performing an iSCSI boot using IPv6, iscsistart still reads the /sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix length is 64, this causes the shift exponent to become negative, triggering a UBSAN warning. As the concept of a subnet mask does not apply to IPv6, the value is set to ~0 to suppress the warning message.
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iscsi_ibft模块在处理IPv6子网掩码时产生负移位指数，触发UBSAN警告。
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 138fe4e069798d9aa948a5402ff15e58f483ee4e ~ a858cd58dea06cf85b142673deea8c5d87f11e70 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2025-21993

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III. Intelligence Information for CVE-2025-21993

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Patches & Fixes for CVE-2025-21993 (1)

Same Patch Batch · Linux · 2025-04-02 · 8 CVEs total

CVE-2025-21988 9.8 CRITICAL fs/netfs/read_collect: add to next->prev_donated
CVE-2025-21994 7.6 HIGH ksmbd: fix incorrect validation for num_aces field of smb_acl
CVE-2025-21992 HID: ignore non-functional sensor in HP 5MP Camera
CVE-2025-21991 x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes
CVE-2025-21990 drm/amdgpu: NULL-check BO's backing store when determining GFX12 PTE flags
CVE-2025-21989 drm/amd/display: fix missing .is_two_pixels_per_container
CVE-2025-21987 drm/amdgpu: init return value in amdgpu_ttm_clear_buffer

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux