In the Linux kernel, the following vulnerability has been resolved:
lwt: Fix return values of BPF xmit ops
BPF encap ops can return different types of positive values, such like
NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function
skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return
values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in
ip(6)_finish_output2. When this happens, skbs that have been freed would
continue to the neighbor subsystem, causing use-after-free bug and
kernel crashes.
To fix the incorrect behavior, skb_do_redirect return values can be
simply discarded, the same as tc-egress behavior. On the other hand,
bpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU
information. Thus convert its return values to avoid the conflict with
LWTUNNEL_XMIT_CONTINUE.
References
Configurations
Configuration 1 (hide)
|
History
11 Dec 2025, 15:47
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux
Linux linux Kernel |
|
| References | () https://git.kernel.org/stable/c/065d5f17096ec9161180e2c890afdff4dc6125f2 - Patch | |
| References | () https://git.kernel.org/stable/c/29b22badb7a84b783e3a4fffca16f7768fb31205 - Patch | |
| References | () https://git.kernel.org/stable/c/65583f9e070db7bece20710cfa2e3daeb0b831d9 - Patch | |
| References | () https://git.kernel.org/stable/c/67f8f2bae8e7ac72e09def2b667e44704c4d1ee1 - Patch | |
| References | () https://git.kernel.org/stable/c/a97f221651fcdc891166e9bc270e3d9bfa5a0080 - Patch | |
| References | () https://git.kernel.org/stable/c/d68c17402442f5f494a2c3ebde5cb82f6aa9160a - Patch | |
| References | () https://git.kernel.org/stable/c/e3f647e4b642f9f6d32795a16f92c116c138d2af - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| CWE | CWE-416 |
17 Sep 2025, 15:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-09-17 15:15
Updated : 2025-12-11 15:47
NVD link : CVE-2023-53338
Mitre link : CVE-2023-53338
CVE.ORG link : CVE-2023-53338
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free