CVE-2026-43139

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: May 6, 2026
Source updated: Oct 19, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

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() 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.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: unaffected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
a1e59abf824969554b90facd44a4ab16e265afa4	`affected`	git	4f28141786e1fe884ce42a5197ba9beed540f0ea	Unavailable	None listed
a1e59abf824969554b90facd44a4ab16e265afa4	`affected`	git	6535867673bf301d52aa00593a4d1d18cc3922fa	Unavailable	None listed
a1e59abf824969554b90facd44a4ab16e265afa4	`affected`	git	eb2ee15290af14c60b45cf2b73f5687d1d077d9b	Unavailable	None listed
a1e59abf824969554b90facd44a4ab16e265afa4	`affected`	git	719918fc88df6da023dfff370cd965151a5afd7f	Unavailable	None listed
a1e59abf824969554b90facd44a4ab16e265afa4	`affected`	git	dc0abce055134cb83b0d981d31ceb20dda419787	Unavailable	None listed
a1e59abf824969554b90facd44a4ab16e265afa4	`affected`	git	c7221e7bd8fc2ef38a0b27be580d9d202281306b	Unavailable	None listed
a1e59abf824969554b90facd44a4ab16e265afa4	`affected`	git	3dcd1664ac15eee6a690daec7c4ffc59190406f7	Unavailable	None listed
a1e59abf824969554b90facd44a4ab16e265afa4	`affected`	git	1799d8abeabc68ec05679292aaf6cba93b343c05	Unavailable	None listed

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: affected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
2.6.19	`affected`	Unavailable	Unavailable	Unavailable	None listed
0	`unaffected`	semver	2.6.19	Unavailable	None listed
5.10.252	`unaffected`	semver	Unavailable	5.10.*	None listed
5.15.202	`unaffected`	semver	Unavailable	5.15.*	None listed
6.1.165	`unaffected`	semver	Unavailable	6.1.*	None listed
6.6.128	`unaffected`	semver	Unavailable	6.6.*	None listed
6.12.75	`unaffected`	semver	Unavailable	6.12.*	None listed
6.18.16	`unaffected`	semver	Unavailable	6.18.*	None listed
6.19.6	`unaffected`	semver	Unavailable	6.19.*	None listed
7.0	`unaffected`	original_commit_for_fix	Unavailable	*	None listed