In the Linux kernel, the following vulnerability has been resolved:
xfrm6: fix uninitialized saddr in xfrm6_get_saddr()
xfrm6_get_saddr() does not check the return value of
ipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable
source address (returns -EADDRNOTAVAIL), saddr->in6 is left
uninitialized, but xfrm6_get_saddr() still returns 0 (success).
This causes the caller xfrm_tmpl_resolve_one() to use the uninitialized
address in xfrm_state_find(), triggering KMSAN warning:
=====================================================
BUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940
xfrm_state_find+0x2424/0xa940
xfrm_resolve_and_create_bundle+0x906/0x5a20
xfrm_lookup_with_ifid+0xcc0/0x3770
xfrm_lookup_route+0x63/0x2b0
ip_route_output_flow+0x1ce/0x270
udp_sendmsg+0x2ce1/0x3400
inet_sendmsg+0x1ef/0x2a0
__sock_sendmsg+0x278/0x3d0
__sys_sendto+0x593/0x720
__x64_sys_sendto+0x130/0x200
x64_sys_call+0x332b/0x3e70
do_syscall_64+0xd3/0xf80
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Local variable tmp.i.i created at:
xfrm_resolve_and_create_bundle+0x3e3/0x5a20
xfrm_lookup_with_ifid+0xcc0/0x3770
=====================================================
Fix by checking the return value of ipv6_dev_get_saddr() and propagating
the error.
References
Configurations
Configuration 1 (hide)
|
History
13 May 2026, 18:41
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
|
| CWE | CWE-908 | |
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05 - Patch | |
| References | () https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7 - Patch | |
| References | () https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea - Patch | |
| References | () https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa - Patch | |
| References | () https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f - Patch | |
| References | () https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b - Patch | |
| References | () https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787 - Patch | |
| References | () https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b - Patch |
08 May 2026, 13:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 8.6 |
06 May 2026, 12:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-06 12:16
Updated : 2026-05-13 18:41
NVD link : CVE-2026-43139
Mitre link : CVE-2026-43139
CVE.ORG link : CVE-2026-43139
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-908
Use of Uninitialized Resource