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CVE-2026-22998

nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

HIGH 7.5

At a glance

Source
NVD
EPSS
EPSS 0.78 % · percentile 56 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec Commit efa56305908b ("nvmet-tcp: Fix a kernel panic when host sends an invalid H2C PDU length") added ttag bounds checking and data_offset validation in nvmet_tcp_handle_h2c_data_pdu(), but it did not validate whether the command's data structures (cmd->req.sg and cmd->iov) have been properly initialized before processing H2C_DATA PDUs. The nvmet_tcp_build_pdu_iovec() function dereferences these pointers without NULL checks. This can be triggered by sending H2C_DATA PDU immediately after the ICREQ/ICRESP handshake, before sending a CONNECT command or NVMe write command. Attack vectors that trigger NULL pointer dereferences: 1. H2C_DATA PDU sent before CONNECT → both pointers NULL 2. H2C_DATA PDU for READ command → cmd->req.sg allocated, cmd->iov NULL 3. H2C_DATA PDU for uninitialized command slot → both pointers NULL The fix validates both cmd->req.sg and cmd->iov before calling nvmet_tcp_build_pdu_iovec(). Both checks are required because: - Uninitialized commands: both NULL - READ commands: cmd->req.sg allocated, cmd->iov NULL - WRITE commands: both allocated

Weaknesses (CWE)

  • CWE-476 — NULL Pointer Dereference

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLinux
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected f775f2621c2ac5cc3a0b3a64665dad4fb146e510 < baabe43a0edefac8cd7b981ff87f967f6034dafe ; affected 4cb3cf7177ae3666be7fb27d4ad4d72a295fb02d < 76abc83a9d25593c2b7613c549413079c14a4686 ; affected 2871aa407007f6f531fae181ad252486e022df42 < 7d75570002929d20e40110d6b03e46202c9d1bc7 ; affected 24e05760186dc070d3db190ca61efdbce23afc88 < fdecd3b6aac10d5a18d0dc500fe57f8648b66cd4 ; affected efa56305908ba20de2104f1b8508c6a7401833be < 3def5243150716be86599c2a1767c29c68838b6d ; affected efa56305908ba20de2104f1b8508c6a7401833be < 374b095e265fa27465f34780e0eb162ff1bef913
Linux · Linuxaffected 6.8 ; unaffected 0 < 6.8 ; unaffected 5.10.249 ≤ 5.10.* ; unaffected 5.15.199 ≤ 5.15.* ; unaffected 6.1.162 ≤ 6.1.* ; unaffected 6.6.122 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD