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NVD / CVE Program· CNA Linux

CVE-2026-52989: nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.35% (FIRST EPSS).
  • 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 046fa5c72d15cd8e2d592e275697ea399d8f76b0, 3df42a854686fa06484e37ac1a3931c8e3e3453c, 5.11; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.143.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 046fa5c72d15cd8e2d592e275697ea399d8f76b0, 3df42a854686fa06484e37ac1a3931c8e3e3453c, 5.11; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.143.1-1 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: nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers Currently, when nvmet_tcp_build_pdu_iovec() detects an out-of-bounds PDU length or offset, it triggers nvmet_tcp_fatal_error(cmd->queue) and returns early. However, because the function returns void, the callers are entirely unaware that a fatal error has occurred and that the cmd->recv_msg.msg_iter was left uninitialized. Callers such as nvmet_tcp_handle_h2c_data_pdu() proceed to blindly overwrite the queue state with queue->rcv_state = NVMET_TCP_RECV_DATA Consequently, the socket receiving loop may attempt to read incoming network data into the uninitialized iterator. Fix this by shifting the error handling responsibility to the callers.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Jun 24, 2026
Updated
Aug 24, 2026
EPSS
0.3% · 29th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CNA vs NVD score

NVD
—
CNA · Linux
9.8
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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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.10.250 and later · before 5.11
  • linux linux kernel5.15.200 and later · before 5.16
  • linux linux kernel6.1.163 and later · before 6.1.175
  • linux linux kernel6.6.124 and later · before 6.6.141
  • linux linux kernel6.12.70 and later · before 6.12.91
  • linux linux kernel6.18.10 and later · before 6.18.33
  • linux linux kernel6.19.1 and later · before 7.0.10
  • linux linux kernel6.19
  • linux linux kernel7.1

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

    • 043b4307a99f902697349128fde93b2ddde4686c, 42afe8ed8ad2de9c19457156244ef3e1eca94b5d, 6.19affected
    • 1385be357e8acd09b36e026567f3a9d5c61139de and later · before 3df42a854686fa06484e37ac1a3931c8e3e3453caffected · git
    • dca1a6ba0da9f472ef040525fab10fd9956db59f and later · before d7c8f95f599b3b38a717d2e771c3f8c174f657c3affected · git
    • 19672ae68d52ff75347ebe2420dde1b07adca09f and later · before f9204a2b78dd18374d3bcf9bf93d9021ce22de1baffected · git
    • ab200d71553bdcf4de554a5985b05b2dd606bc57 and later · before c2a11441538bdbbc5aa003f190995eba93a89b88affected · git
    • 52a0a98549344ca20ad81a4176d68d28e3c05a5c and later · before 046fa5c72d15cd8e2d592e275697ea399d8f76b0affected · git
    • 52a0a98549344ca20ad81a4176d68d28e3c05a5c and later · before ea8e356acb165cb1fd75537a52e1f66e5e76c538affected · git
    • 6.1.163 and later · before 6.1.175affected · semver
    • 6.6.124 and later · before 6.6.141affected · semver
    • 6.12.70 and later · before 6.12.91affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.10-17.0.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-52980Jun 24, 2026 · sched/fair: Clear rel_deadline when initializing forked entities
    22Monitor
  • ← EarlierCVE-2026-52987Jun 24, 2026 · drm/amdgpu: avoid double drm_exec_fini() in userq validate
    31Monitor
  • Later →CVE-2026-52992Jun 24, 2026 · fs/adfs: validate nzones in adfs_validate_bblk()
    31Monitor

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 Linux046fa5c72d15cd8e2d592e275697ea399d8f76b0Vendor (CNA)
Linux Linux3df42a854686fa06484e37ac1a3931c8e3e3453cVendor (CNA)
Linux Linux5.11Vendor (CNA)
Linux Linux5.16Vendor (CNA)
Linux Linux6.1.175Vendor (CNA)
Linux Linux6.12.91Vendor (CNA)
Linux Linux6.18.33Vendor (CNA)
Linux Linux6.6.141Vendor (CNA)
Linux Linuxc2a11441538bdbbc5aa003f190995eba93a89b88Vendor (CNA)
Linux Linuxd7c8f95f599b3b38a717d2e771c3f8c174f657c3Vendor (CNA)
Linux Linuxea8e356acb165cb1fd75537a52e1f66e5e76c538Vendor (CNA)
Linux Linuxf9204a2b78dd18374d3bcf9bf93d9021ce22de1bVendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)

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.

No history yet (it accumulates with the daily EPSS job).

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.

  • CVE-2026-532251 days apartsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
    36Monitor
  • CVE-2026-531701 days apartaccel/ethosu: reject DMA commands with uninitialized length
    35Monitor
  • CVE-2026-4313949 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()
    34Monitor
  • CVE-2026-4329147 days apartnet: nfc: nci: Fix parameter validation for packet data
    33Monitor
  • CVE-2026-6387025 days apartieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()
    31Monitor
  • CVE-2026-6408225 days apartriscv: Fix register corruption from uninitialized cregs on error
    31Monitor

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
high · data or configuration can be modified
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
High
Availability impact
High

Weakness class (CWE)

CWE-908 · Use of Uninitialized Resource

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 (8 more)

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

All records