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CVE-2026-31464— scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

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，该漏洞源于未验证num_written值，可能导致恶意VIO服务器返回超出max_targets的值，造成越界访问和内核内存泄露。

CVSS 8.1 · High EPSS 0.42% · P35

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 072b91f9c6510d0ec4a49d07dbc318760c7da7b3< d842348f8a00d5b1d7358f207eb34ffcf5b16df3 affected
072b91f9c6510d0ec4a49d07dbc318760c7da7b3< a007246cb6c9ebdc93dafbf63cc2d43d98f402cc affected
072b91f9c6510d0ec4a49d07dbc318760c7da7b3< 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 affected
072b91f9c6510d0ec4a49d07dbc318760c7da7b3< 4ed727e35b0ab17d3eeeb1e8023768396e2be161 affected
072b91f9c6510d0ec4a49d07dbc318760c7da7b3< d1466bf991b2343cf2ba8336e440c8faf3cbb780 affected
072b91f9c6510d0ec4a49d07dbc318760c7da7b3< 786f10b1966e485046839f992e89f2c18cbd1983 affected
072b91f9c6510d0ec4a49d07dbc318760c7da7b3< bae4df0a643fa7f84663473aa3082a9c2ed139db affected
072b91f9c6510d0ec4a49d07dbc318760c7da7b3< 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f affected
… +10 more rows
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I. Basic Information for CVE-2026-31464

Vulnerability Information
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Vulnerability Title
scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() A malicious or compromised VIO server can return a num_written value in the discover targets MAD response that exceeds max_targets. This value is stored directly in vhost->num_targets without validation, and is then used as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which is only allocated for max_targets entries. Indices at or beyond max_targets access kernel memory outside the DMA-coherent allocation. The out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI MADs that are sent back to the VIO server, leaking kernel memory. Fix by clamping num_written to max_targets before storing it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/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，该漏洞源于未验证num_written值，可能导致恶意VIO服务器返回超出max_targets的值，造成越界访问和内核内存泄露。
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 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 ~ d842348f8a00d5b1d7358f207eb34ffcf5b16df3 -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2026-31464

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III. Intelligence Information for CVE-2026-31464

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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total

CVE-2026-31463 9.8 CRITICAL iomap: fix invalid folio access when i_blkbits differs from I/O granularity
CVE-2026-31436 9.8 CRITICAL dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
CVE-2026-31444 9.8 CRITICAL ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()
CVE-2026-31478 9.8 CRITICAL ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
CVE-2026-31501 9.8 CRITICAL net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
CVE-2026-31448 9.4 CRITICAL ext4: avoid infinite loops caused by residual data
CVE-2026-31432 8.8 HIGH ksmbd: fix OOB write in QUERY_INFO for compound requests
CVE-2026-31433 8.8 HIGH ksmbd: fix potencial OOB in get_file_all_info() for compound requests
CVE-2026-31435 8.8 HIGH netfs: Fix read abandonment during retry
CVE-2026-31450 8.8 HIGH ext4: publish jinode after initialization
CVE-2026-31476 8.2 HIGH ksmbd: do not expire session on binding failure
CVE-2026-31513 8.1 HIGH Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
CVE-2026-31502 7.8 HIGH team: fix header_ops type confusion with non-Ethernet ports
CVE-2026-31454 7.8 HIGH xfs: save ailp before dropping the AIL lock in push callbacks
CVE-2026-31494 7.8 HIGH net: macb: use the current queue number for stats
CVE-2026-31488 7.8 HIGH drm/amd/display: Do not skip unrelated mode changes in DSC validation
CVE-2026-31446 7.8 HIGH ext4: fix use-after-free in update_super_work when racing with umount
CVE-2026-31504 7.8 HIGH net: fix fanout UAF in packet_release() via NETDEV_UP race
CVE-2026-31505 7.8 HIGH iavf: fix out-of-bounds writes in iavf_get_ethtool_stats()
CVE-2026-31431 7.8 HIGH crypto: algif_aead - Revert to operating out-of-place

Showing top 20 of 100 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31464

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