In the Linux kernel, the following vulnerability has been resolved:
net/sched: cls_flow: fix NULL pointer dereference on shared blocks
flow_change() calls tcf_block_q() and dereferences q->handle to derive
a default baseclass. Shared blocks leave block->q NULL, causing a NULL
deref when a flow filter without a fully qualified baseclass is created
on a shared block.
Check tcf_block_shared() before accessing block->q and return -EINVAL
for shared blocks. This avoids the null-deref shown below:
=======================================================================
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
RIP: 0010:flow_change (net/sched/cls_flow.c:508)
Call Trace:
tc_new_tfilter (net/sched/cls_api.c:2432)
rtnetlink_rcv_msg (net/core/rtnetlink.c:6980)
[...]
=======================================================================
References
Configurations
Configuration 1 (hide)
|
History
20 May 2026, 18:08
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/1a280dd4bd1d616a01d6ffe0de284c907b555504 - Patch | |
| References | () https://git.kernel.org/stable/c/415ea0c973c754b9f375225807810eb9045f4293 - Patch | |
| References | () https://git.kernel.org/stable/c/4a09f72007201c9f667dc47f64517ec23eea65e5 - Patch | |
| References | () https://git.kernel.org/stable/c/57f94ac7e953eece5ed4819605a18f3cdfc63dcc - Patch | |
| References | () https://git.kernel.org/stable/c/942813276edeb1741fa5b0a73471beb4e495fa08 - Patch | |
| References | () https://git.kernel.org/stable/c/9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e - Patch | |
| References | () https://git.kernel.org/stable/c/a208c3e1232997e9317887294c20008dfcb75449 - Patch | |
| References | () https://git.kernel.org/stable/c/cc707a4fd4c3b6ab2722e06bc359aa010e13d408 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
|
| CWE | CWE-476 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| First Time |
Linux linux Kernel
Linux |
18 Apr 2026, 09:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
13 Apr 2026, 14:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-13 14:16
Updated : 2026-05-20 18:08
NVD link : CVE-2026-31422
Mitre link : CVE-2026-31422
CVE.ORG link : CVE-2026-31422
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference