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NVD / CVE Program· CNA Linux

CVE-2026-90011: scsi: target: iscsi: Reserve a terminator byte for the login payload

Noroxi assessment

Priority: Monitor (action score 36/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.84% (FIRST EPSS); higher than 58.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1624bff4c5118ad494d50ad94d44f22064667a7f, 3ddf3ea291a0ef2ea93b82e158960ac2cc42302b, 5fac79f248c37774d1dd761406f83d25ca6ff8e4; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1624bff4c5118ad494d50ad94d44f22064667a7f, 3ddf3ea291a0ef2ea93b82e158960ac2cc42302b, 5fac79f248c37774d1dd761406f83d25ca6ff8e4; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
Sep 16, 2026
Updated
Oct 19, 2026
EPSS
0.8% · 58th percentile
CWE
—

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CNA vs NVD score

NVD
—
CNA · Linux
9.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.1affected
    • e48354ce078c079996f89d715dfa44814b4eba01 and later · before 5fac79f248c37774d1dd761406f83d25ca6ff8e4affected · git
    • e48354ce078c079996f89d715dfa44814b4eba01 and later · before 6ddddcad436d8e6e619204d3c848147ff2f5bf1eaffected · git
    • e48354ce078c079996f89d715dfa44814b4eba01 and later · before b19dc17ed963ac36c0db4b52a1803fb11169f91faffected · git
    • e48354ce078c079996f89d715dfa44814b4eba01 and later · before 6b589ef9d5f6cdc70d2b4f269ca6cf26b5ebb076affected · git
    • e48354ce078c079996f89d715dfa44814b4eba01 and later · before eb9dadf4d552ebe10644871c5189286552aa48f5affected · git
    • e48354ce078c079996f89d715dfa44814b4eba01 and later · before 1624bff4c5118ad494d50ad94d44f22064667a7faffected · git
    • e48354ce078c079996f89d715dfa44814b4eba01 and later · before 3ddf3ea291a0ef2ea93b82e158960ac2cc42302baffected · git
    • e48354ce078c079996f89d715dfa44814b4eba01 and later · before f4825922d2fb371e2b969697d792077f1b62b62caffected · git
    • before 3.1not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90009Sep 16, 2026 · scsi: bsg: Fix TOCTOU in io_uring passthrough command setup
    31Monitor
  • ← EarlierCVE-2026-90010Sep 16, 2026 · scsi: bsg: Cap io_uring sense copy to max_response_len
    31Monitor
  • Later →CVE-2026-90012Sep 16, 2026 · spi: Fix DMA mapping ownership on partial map failure
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1624bff4c5118ad494d50ad94d44f22064667a7fVendor (CNA)
Linux Linux3ddf3ea291a0ef2ea93b82e158960ac2cc42302bVendor (CNA)
Linux Linux5fac79f248c37774d1dd761406f83d25ca6ff8e4Vendor (CNA)
Linux Linux6b589ef9d5f6cdc70d2b4f269ca6cf26b5ebb076Vendor (CNA)
Linux Linux6ddddcad436d8e6e619204d3c848147ff2f5bf1eVendor (CNA)
Linux Linuxb19dc17ed963ac36c0db4b52a1803fb11169f91fVendor (CNA)
Linux Linuxeb9dadf4d552ebe10644871c5189286552aa48f5Vendor (CNA)
Linux Linuxf4825922d2fb371e2b969697d792077f1b62b62cVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.180.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.180.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.180.1.rt7.521.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
rocky linux:kernel0:4.18.0-553.180.1.el8_10 · Rocky Linux:8Package registry (OSV)
rocky linux:kernel-rt0:4.18.0-553.180.1.rt7.521.el8_10 · Rocky Linux:8Package registry (OSV)
suse:kernel-64kb6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:kernel-default3.0.101-108.226.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-default-base6.4.0-150600.23.143.1.150600.12.66.3 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)

+9

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records