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TI-2026-61054 Aliases CVE-2026-90011GHSA-m4f8-5753-34xg

scsi: target: iscsi: Reserve a terminator byte for the login payload

Priority MEDIUM 41Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · High
Fix status
Partial Red Hat: 17 fixed, 4 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: target: iscsi: Reserve a terminator byte for the login payload iscsi_target_check_login_request() rejects a login PDU whose DataSegmentLength exceeds MAX_KEY_VALUE_PAIRS, but the test is '>' and login->req_buf is allocated with exactly MAX_KEY_VALUE_PAIRS bytes. Since iscsit_get_login_rx() receives payload_length + padding bytes, where padding = ((-payload_length) & 3); any payload_length from 8189 to 8192 fills the whole 8192 byte buffer. The write stays in bounds, but no byte is left for a NUL terminator. The buffer is subsequently consumed as a C string. In the CHAP path chap_check_algorithm() calls kstrdup(a_str), and extract_param() calls strstr(in_buf, pattern) followed by strlen_semi(), none of which take a length. convert_null_to_semi() additionally rewrites every embedded NUL to ';', so even a payload made of well formed NUL separated key=value records is left without a terminator. These walk past the end of the object into adjacent slab memory. It is reachable by an unauthenticated initiator against a portal configured for CHAP; when authentication is not required iscsi_login_zero_tsih_s2() rewrites AuthMethod to None and the CHAP path is never entered. Allocate one extra byte. kzalloc() zeroes it and nothing ever writes to it, as every writer copies to offset 0 for at most MAX_KEY_VALUE_PAIRS bytes, so the buffer is always terminated.

Why it matters now

EPSS 0.00841 58th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.270, 5.15.221, 6.1.188 +5Red Hat: 5 advisoriesRed Hat: 17 fixed, 4 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux3.1 and later5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5, 7.3Patch availableCNA
  • Linux VendorLinux Affected 3.1 and later Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5, 7.3 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 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5, 7.3

Red Hat 5 advisories

  • RHSA-2026:95346 Released 2026-11-06 · Red Hat rating Critical
    OpenShift Container Platform 4.22.22 bug fix and security update
    • Red Hat OpenShift Container Platform 4.22 rhcos-aarch64-4.22.9.8.202611032353-0, rhcos-ppc64le-4.22.9.8.202611032353-0, rhcos-s390x-4.22.9.8.202611032353-0 +1
  • RHSA-2026:93413 Released 2026-11-01 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • 10Base-SMTV kernel-modules-internal-6.12.0-211.72.1.el10_2
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.72.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.72.1.el10_2, kernel-64k-devel-6.12.0-211.72.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.72.1.el10_2, kernel-64k-6.12.0-211.72.1.el10_2, kernel-64k-core-6.12.0-211.72.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.72.1.el10_2, libperf-6.12.0-211.72.1.el10_2
    • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.72.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.72.1.el10_2, kernel-rt-64k-6.12.0-211.72.1.el10_2, kernel-rt-64k-core-6.12.0-211.72.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.72.1.el10_2, kernel-rt-core-6.12.0-211.72.1.el10_2, kernel-rt-debug-6.12.0-211.72.1.el10_2 +9
  • RHSA-2026:93412 Released 2026-11-01 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.64.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.64.1.el9_8, kernel-64k-devel-5.14.0-687.64.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.64.1.el9_8, kernel-64k-5.14.0-687.64.1.el9_8, kernel-64k-core-5.14.0-687.64.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.64.1.el9_8, libperf-5.14.0-687.64.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.64.1.el9_8, kernel-rt-64k-5.14.0-687.64.1.el9_8, kernel-rt-64k-core-5.14.0-687.64.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.64.1.el9_8, kernel-rt-core-5.14.0-687.64.1.el9_8, kernel-rt-debug-5.14.0-687.64.1.el9_8 +9
Show 2 more Red Hat advisories
  • RHSA-2026:92209 Released 2026-10-29 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.180.1.el8_10, kernel-4.18.0-553.180.1.el8_10, kernel-abi-stablelists-4.18.0-553.180.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.180.1.el8_10
  • RHSA-2026:92208 Released 2026-10-29 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.180.1.rt7.521.el8_10, kernel-rt-core-4.18.0-553.180.1.rt7.521.el8_10, kernel-rt-debug-4.18.0-553.180.1.rt7.521.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.180.1.rt7.521.el8_10, kernel-rt-core-4.18.0-553.180.1.rt7.521.el8_10, kernel-rt-debug-4.18.0-553.180.1.rt7.521.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 OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift Container Platform 5AffectedNo fix yet
10Base-SMTVFixed RHSA-2026:93413
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:93413
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:93412
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:93413
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:92209
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:93412
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:92209
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:93413
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:93412
Red Hat Enterprise Linux Hidden (v. 10)Fixed RHSA-2026:93413
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:92208
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:92208
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:93413
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:93412
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:93413
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:93412
Red Hat OpenShift Container Platform 4.22Fixed RHSA-2026:95346
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-90011
  2. 2026-10-03 Alias added: GHSA-m4f8-5753-34xg
  3. 2026-10-16 Affected versions changed · Red Hat
  4. 2026-10-16 CVSS score added · Red Hat
  5. 2026-10-19 Fix available: Linux/[email protected] · CNA
  6. 2026-10-30 Affected versions changed · Red Hat
  7. 2026-10-30 Fix available: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8), Red Hat Enterprise Linux NFV (v. 8) +1 · Red Hat
  8. 2026-11-01 Fix available: RHSA-2026:92208 · Red Hat
  9. 2026-11-01 Fix available: RHSA-2026:92209 · Red Hat
  10. 2026-11-02 Fix available: RHSA-2026:93413 · Red Hat
  11. 2026-11-02 Fix available: RHSA-2026:93412 · Red Hat
  12. 2026-11-02 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9) +9 · Red Hat
  13. 2026-11-07 Fix available: RHSA-2026:95346 · Red Hat
  14. 2026-11-07 Fix available: Red Hat OpenShift Container Platform 4.22 · 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