CVE-2026-43139 Details
Description
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.
A vulnerability exists in the Linux kernel's IPsec implementation for IPv6, specifically within the xfrm6_get_saddr() function. This function fails to properly handle errors when retrieving source addresses, leaving the address variable uninitialized. As a result, subsequent operations can inadvertently use this uninitialized data, leading to potential memory corruption issues. This flaw has been identified and fixed in the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for downloading the patched version are available on the Linux kernel official website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05 | kernel.org | Patch |
| https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea | kernel.org | Patch |
| https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa | kernel.org | Patch |
| https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f | kernel.org | Patch |
| https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b | kernel.org | Patch |
| https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787 | kernel.org | Patch |
| https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-908 | Use of Uninitialized Resource | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.19, < 5.10.252 >= 5.11, < 5.15.202 >= 5.16, < 6.1.165 >= 6.2, < 6.6.128 >= 6.7, < 6.12.75 >= 6.13, < 6.18.16 >= 6.19, < 6.19.6 7.0 rc1 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 13, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | CVE Modified | kernel.org |
| May 6, 2026 | New CVE Received | kernel.org |