Home/CVE/In the Linux kernel, the following vulnerability has been resolved: xfrm6: fix uninitialized saddr in xfrm6_get_saddr()
CVE

CVE-2026-43139

In the Linux kernel, the following vulnerability has been resolved: xfrm6: fix uninitialized saddr in xfrm6_get_saddr()

In the Linux kernel, the following vulnerability has been resolved: xfrm6: fix uninitialized saddr in 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_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.

HIGH · CVSS 8.6 EPSS 0.00068
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-908Use of Uninitialized Resource
▤

Affected Products & Versions

8
linux kernel>= 2.6.19 and < 5.10.252
linux kernel>= 5.11 and < 5.15.202
linux kernel>= 5.16 and < 6.1.165
linux kernel>= 6.2 and < 6.6.128
linux kernel>= 6.7 and < 6.12.75
linux kernel>= 6.13 and < 6.18.16
linux kernel>= 6.19 and < 6.19.6
linux kernelall versions
▣

Scoring & Timeline

8.6
HIGH · CVSS v3.1 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 May 2026 · 12:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05Patch
https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7Patch
https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0eaPatch
https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922faPatch
https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7fPatch
https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306bPatch
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