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TI-2026-52339 Aliases CVE-2026-74556GHSA-2m3x-37gx-2chv

scsi: libiscsi_tcp: Bound SCSI Response data segment to the connection buffer

Priority MEDIUM 49Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 36 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi_tcp: Bound SCSI Response data segment to the connection buffer iscsi_tcp_hdr_dissect() receives the data segment of several PDU types into the fixed-size conn->data buffer, which is allocated for ISCSI_DEF_MAX_RECV_SEG_LEN (8192) bytes. For the LOGIN_RSP, TEXT_RSP, REJECT and ASYNC_EVENT opcodes the dissect path already rejects a PDU whose DataSegmentLength exceeds that buffer. The SCSI Command Response (ISCSI_OP_SCSI_CMD_RSP) path also copies its data segment (sense/response data) into conn->data via iscsi_tcp_data_recv_prep(), but it does so without the same check. The only upstream bound on in.datalen is conn->max_recv_dlength, the initiator's advertised MaxRecvDataSegmentLength, which is commonly negotiated well above 8192 (open-iscsi defaults to 262144). A target that returns a SCSI Response with a DataSegmentLength between 8193 and max_recv_dlength therefore overflows the 8192-byte conn->data buffer. Once the same bound applies, ISCSI_OP_SCSI_CMD_RSP is handled exactly like those responses: bound the data segment, receive it into conn->data when present, and otherwise complete the PDU with no data. Fold the opcode into that case group rather than duplicating the check.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00399 34th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.265, 5.15.216, 6.1.183 +5Red Hat: 11 advisoriesRed Hat: 36 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux2.6.29 and later5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2Patch availableCNA
  • Linux VendorLinux Affected 2.6.29 and later Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2

Red Hat 11 advisories

  • RHSA-2026:94558 Released 2026-11-03 · Red Hat rating Critical
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-core-5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-5.14.0-284.202.1.rt14.487.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-core-5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-5.14.0-284.202.1.rt14.487.el9_2 +11
  • RHSA-2026:94508 Released 2026-11-03 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.117.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.117.1.el10_0, kernel-64k-devel-6.12.0-55.117.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.117.1.el10_0, kernel-64k-6.12.0-55.117.1.el10_0, kernel-64k-core-6.12.0-55.117.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.117.1.el10_0, libperf-6.12.0-55.117.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.117.1.el10_0, kernel-rt-64k-6.12.0-55.117.1.el10_0, kernel-rt-64k-core-6.12.0-55.117.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.117.1.el10_0, kernel-rt-core-6.12.0-55.117.1.el10_0, kernel-rt-debug-6.12.0-55.117.1.el10_0 +11
  • RHSA-2026:94477 Released 2026-11-03 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.202.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.202.1.el9_2, kernel-64k-devel-5.14.0-284.202.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.202.1.el9_2, kernel-5.14.0-284.202.1.el9_2, kernel-64k-5.14.0-284.202.1.el9_2 +29
Show 8 more Red Hat advisories
  • RHSA-2026:94109 Released 2026-11-02 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.161.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.161.1.el9_4, kernel-64k-devel-5.14.0-427.161.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.161.1.el9_4, kernel-5.14.0-427.161.1.el9_4, kernel-64k-5.14.0-427.161.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.161.1.el9_4, kernel-rt-core-5.14.0-427.161.1.el9_4, kernel-rt-debug-5.14.0-427.161.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.161.1.el9_4, kernel-rt-core-5.14.0-427.161.1.el9_4, kernel-rt-debug-5.14.0-427.161.1.el9_4 +11
  • RHSA-2026:91492 Released 2026-10-28 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.152.1.el9_6, libperf-5.14.0-570.152.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.152.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.152.1.el9_6, kernel-64k-devel-5.14.0-570.152.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.152.1.el9_6, kernel-64k-5.14.0-570.152.1.el9_6, kernel-64k-core-5.14.0-570.152.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.152.1.el9_6, kernel-rt-64k-5.14.0-570.152.1.el9_6, kernel-rt-64k-core-5.14.0-570.152.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.152.1.el9_6, kernel-rt-core-5.14.0-570.152.1.el9_6, kernel-rt-debug-5.14.0-570.152.1.el9_6 +11
  • RHSA-2026:77217 Released 2026-10-07 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.211.1.el8_4, kernel-4.18.0-305.211.1.el8_4, kernel-abi-stablelists-4.18.0-305.211.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.211.1.el8_4, kernel-4.18.0-305.211.1.el8_4, kernel-abi-stablelists-4.18.0-305.211.1.el8_4 +19
  • RHSA-2026:77216 Released 2026-10-07 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.220.1.el8_6, kernel-4.18.0-372.220.1.el8_6, kernel-abi-stablelists-4.18.0-372.220.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.220.1.el8_6, kernel-4.18.0-372.220.1.el8_6, kernel-abi-stablelists-4.18.0-372.220.1.el8_6 +19
  • RHSA-2026:67470 Released 2026-09-15 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.48.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.48.1.el9_8, kernel-64k-devel-5.14.0-687.48.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.48.1.el9_8, kernel-64k-5.14.0-687.48.1.el9_8, kernel-64k-core-5.14.0-687.48.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.48.1.el9_8, libperf-5.14.0-687.48.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.48.1.el9_8, kernel-rt-64k-5.14.0-687.48.1.el9_8, kernel-rt-64k-core-5.14.0-687.48.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.48.1.el9_8, kernel-rt-core-5.14.0-687.48.1.el9_8, kernel-rt-debug-5.14.0-687.48.1.el9_8 +9
  • RHSA-2026:67471 Released 2026-09-15 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.55.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.55.1.el10_2, kernel-64k-devel-6.12.0-211.55.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.55.1.el10_2, kernel-64k-6.12.0-211.55.1.el10_2, kernel-64k-core-6.12.0-211.55.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.55.1.el10_2, libperf-6.12.0-211.55.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.55.1.el10_2, kernel-rt-64k-6.12.0-211.55.1.el10_2, kernel-rt-64k-core-6.12.0-211.55.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.55.1.el10_2, kernel-rt-core-6.12.0-211.55.1.el10_2, kernel-rt-debug-6.12.0-211.55.1.el10_2 +9
  • RHSA-2026:67468 Released 2026-09-15 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.163.1.el8_10, kernel-4.18.0-553.163.1.el8_10, kernel-abi-stablelists-4.18.0-553.163.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.163.1.el8_10
  • RHSA-2026:67469 Released 2026-09-15 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-core-4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-debug-4.18.0-553.163.1.rt7.504.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-core-4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-debug-4.18.0-553.163.1.rt7.504.el8_10 +7

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:91492
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:67471
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:94477
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:94109
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:94508
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:91492
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:67471
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:67468
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:77217
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:77216
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:94477
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:94109
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:94508
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:91492
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:77217
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:77216
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:67468
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:67471
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:94508
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:67469
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:67469
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:67471
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:94558
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:94109
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:94508
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:91492
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:67471
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:94558
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:94109
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:94508
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:91492
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-74556
  2. 2026-10-03 Alias added: GHSA-2m3x-37gx-2chv
  3. 2026-10-07 Fix available: RHSA-2026:77216 · Red Hat
  4. 2026-10-07 Fix available: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) · Red Hat
  5. 2026-10-07 Fix available: RHSA-2026:77217 · Red Hat
  6. 2026-10-07 Fix available: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) · Red Hat
  7. 2026-10-18 CISA SSVC decision points changed
  8. 2026-10-30 Fix available: RHSA-2026:91492 · Red Hat
  9. 2026-10-30 Fix available: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6) +2 · Red Hat
  10. 2026-11-03 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4) +1 · Red Hat
  11. 2026-11-03 Fix available: RHSA-2026:94109 · Red Hat
  12. 2026-11-03 Fix available: RHSA-2026:94477 · Red Hat
  13. 2026-11-03 Fix available: RHSA-2026:94508 · Red Hat
  14. 2026-11-03 Fix available: RHSA-2026:94558 · Red Hat
  15. 2026-11-03 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS E4S (v.9.2) +6 · Red Hat

References

Other 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences