xfrm6: fix uninitialized saddr in xfrm6_get_saddr()

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Summary

CVECVE-2026-43139
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:31 UTC
Updated2026-05-06 13:07:51 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a1e59abf824969554b90facd44a4ab16e265afa4 4f28141786e1fe884ce42a5197ba9beed540f0ea git Not specified
CNA Linux Linux affected a1e59abf824969554b90facd44a4ab16e265afa4 6535867673bf301d52aa00593a4d1d18cc3922fa git Not specified
CNA Linux Linux affected a1e59abf824969554b90facd44a4ab16e265afa4 eb2ee15290af14c60b45cf2b73f5687d1d077d9b git Not specified
CNA Linux Linux affected a1e59abf824969554b90facd44a4ab16e265afa4 719918fc88df6da023dfff370cd965151a5afd7f git Not specified
CNA Linux Linux affected a1e59abf824969554b90facd44a4ab16e265afa4 dc0abce055134cb83b0d981d31ceb20dda419787 git Not specified
CNA Linux Linux affected a1e59abf824969554b90facd44a4ab16e265afa4 c7221e7bd8fc2ef38a0b27be580d9d202281306b git Not specified
CNA Linux Linux affected a1e59abf824969554b90facd44a4ab16e265afa4 3dcd1664ac15eee6a690daec7c4ffc59190406f7 git Not specified
CNA Linux Linux affected a1e59abf824969554b90facd44a4ab16e265afa4 1799d8abeabc68ec05679292aaf6cba93b343c05 git Not specified
CNA Linux Linux affected 2.6.19 Not specified
CNA Linux Linux unaffected 2.6.19 semver Not specified
CNA Linux Linux unaffected 5.10.252 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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