CVE-2026-43139xfrm6: fix uninitialized saddr in xfrm6_get_saddr()
Updated under an hour ago ()
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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.
- CVSS
- 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from a1e59abf824969554b90facd44a4ab16e265afa4 before 4f28141786e1fe884ce42a5197ba9beed540f0ea; from a1e59abf824969554b90facd44a4ab16e265afa4 before 6535867673bf301d52aa00593a4d1d18cc3922fa; from a1e59abf824969554b90facd44a4ab16e265afa4 before eb2ee15290af14c60b45cf2b73f5687d1d077d9b; from a1e59abf824969554b90facd44a4ab16e265afa4 before 719918fc88df6da023dfff370cd965151a5afd7f; from a1e59abf824969554b90facd44a4ab16e265afa4 before dc0abce055134cb83b0d981d31ceb20dda419787; from a1e59abf824969554b90facd44a4ab16e265afa4 before c7221e7bd8fc2ef38a0b27be580d9d202281306b; from a1e59abf824969554b90facd44a4ab16e265afa4 before 3dcd1664ac15eee6a690daec7c4ffc59190406f7; from a1e59abf824969554b90facd44a4ab16e265afa4 before 1799d8abeabc68ec05679292aaf6cba93b343c05 | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.19 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0eapatch
- https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fapatch
- https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9bpatch
- https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7fpatch
- https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787patch
- https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306bpatch
- https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7patch
- https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.