CVE-2026-43139High· 8.6▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 47.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.4%
Last analysed / modified upstream
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
Fix by checking the return value of ipv6_dev_get_saddr() and propagating the error.
Linux >= a1e59abf824969554b90facd44a4ab16e265afa4 < 4f28141786e1fe884ce42a5197ba9beed540f0eaLinux >= a1e59abf824969554b90facd44a4ab16e265afa4 < 6535867673bf301d52aa00593a4d1d18cc3922faLinux >= a1e59abf824969554b90facd44a4ab16e265afa4 < eb2ee15290af14c60b45cf2b73f5687d1d077d9bLinux >= a1e59abf824969554b90facd44a4ab16e265afa4 < 719918fc88df6da023dfff370cd965151a5afd7fLinux >= a1e59abf824969554b90facd44a4ab16e265afa4 < dc0abce055134cb83b0d981d31ceb20dda419787Linux >= a1e59abf824969554b90facd44a4ab16e265afa4 < c7221e7bd8fc2ef38a0b27be580d9d202281306bLinux >= a1e59abf824969554b90facd44a4ab16e265afa4 < 3dcd1664ac15eee6a690daec7c4ffc59190406f7Linux >= a1e59abf824969554b90facd44a4ab16e265afa4 < 1799d8abeabc68ec05679292aaf6cba93b343c05Linux 2.6.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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