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
References
Configurations
Configuration 1 (hide)
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History
26 Feb 2026, 17:07
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* |
|
| First Time |
Linux
Linux linux Kernel |
|
| CWE | CWE-476 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| References | () https://git.kernel.org/stable/c/32b63acd78f577b332d976aa06b56e70d054cbba - Patch | |
| References | () https://git.kernel.org/stable/c/374b095e265fa27465f34780e0eb162ff1bef913 - Patch | |
| References | () https://git.kernel.org/stable/c/3def5243150716be86599c2a1767c29c68838b6d - Patch | |
| References | () https://git.kernel.org/stable/c/76abc83a9d25593c2b7613c549413079c14a4686 - Patch | |
| References | () https://git.kernel.org/stable/c/7d75570002929d20e40110d6b03e46202c9d1bc7 - Patch | |
| References | () https://git.kernel.org/stable/c/baabe43a0edefac8cd7b981ff87f967f6034dafe - Patch | |
| References | () https://git.kernel.org/stable/c/fdecd3b6aac10d5a18d0dc500fe57f8648b66cd4 - Patch |
06 Feb 2026, 17:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
30 Jan 2026, 10:15
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
25 Jan 2026, 15:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-01-25 15:15
Updated : 2026-02-26 17:07
NVD link : CVE-2026-22998
Mitre link : CVE-2026-22998
CVE.ORG link : CVE-2026-22998
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference