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CVE-2026-74557— scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer

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基金会开源的一个操作系统内核。 Linux kernel 2.6.18版本存在安全漏洞，该漏洞源于iscsi_scsi_cmd_rsp()函数在复制SCSI Response的sense data时边界检查不当，未考虑2字节的sense长度前缀，导致越界读取并可能将陈旧数据泄露到sense缓冲区中返回给用户空间。

CVSS 7.5 · High EPSS 0.33% · P24

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8< 812f1ae95b22419422972748f173b0916ee4d621 affected
7996a778ff8c717cb1a7a294475c59cc8f1e9fb8< fef6167e8149896cd81bea333fd51b1c91239149 affected
7996a778ff8c717cb1a7a294475c59cc8f1e9fb8< baa04572673125e4d5bc309b4077d1cb46cc78d1 affected
7996a778ff8c717cb1a7a294475c59cc8f1e9fb8< 7567f06abdefb1caf2d836107c4d08c5185c650e affected
7996a778ff8c717cb1a7a294475c59cc8f1e9fb8< 60499924faf4ef97e84228c20515218ef121facf affected
7996a778ff8c717cb1a7a294475c59cc8f1e9fb8< 3ef209ca0b4b68c75e9a814d90cc916026b5a6ac affected
7996a778ff8c717cb1a7a294475c59cc8f1e9fb8< 1f07a897d43c63e6c9458bf77450defef39b5833 affected
7996a778ff8c717cb1a7a294475c59cc8f1e9fb8< 98b87885de4b7f605533a2860685f5689fce8e82 affected
… +10 more rows
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I. Basic Information for CVE-2026-74557

Vulnerability Information
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Vulnerability Title
scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer iscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the target-supplied data segment. The segment carries a 2-byte sense length followed by the sense bytes, so it must hold 2 + senselen bytes, but the bounds check only requires datalen >= senselen: senselen = get_unaligned_be16(data); if (datalen < senselen) goto invalid_datalen; memcpy(sc->sense_buffer, data + 2, min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); A target that returns a SCSI Response whose datalen equals senselen (with senselen <= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data + 2 read up to two bytes past the received data. Those bytes are stale conn->data contents and end up in the command's sense buffer, which is returned to userspace. Account for the 2-byte sense length prefix in the check.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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基金会开源的一个操作系统内核。 Linux kernel 2.6.18版本存在安全漏洞，该漏洞源于iscsi_scsi_cmd_rsp()函数在复制SCSI Response的sense data时边界检查不当，未考虑2字节的sense长度前缀，导致越界读取并可能将陈旧数据泄露到sense缓冲区中返回给用户空间。
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 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 ~ 812f1ae95b22419422972748f173b0916ee4d621 -
Linux Linux 2.6.18 -

II. Public POCs for CVE-2026-74557

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III. Intelligence Information for CVE-2026-74557

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Patches & Fixes for CVE-2026-74557 (7)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-74267 9.8 CRITICAL net/sched: sch_codel: Do not call qdisc_tree_reduce_backlog during peek before restoring q
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72207 9.8 CRITICAL ntfs: not change 0-byte $DATA attribute to non-resident

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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