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CVE-2026-43139

xfrm6: fix uninitialized saddr in xfrm6_get_saddr()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From a1e59abf824969554b90facd44a4ab16e265afa4 · fixed in 4f28141786e1fe884ce42a5197ba9beed540f0ea; From a1e59abf824969554b90facd44a4ab16e265afa4 · fixed in 6535867673bf301d52aa00593a4d1d18cc3922fa; From a1e59abf824969554b90facd44a4ab16e265afa4 · fixed in eb2ee15290af14c60b45cf2b73f5687d1d077d9b; From a1e59abf824969554b90facd44a4ab16e265afa4 · fixed in 719918fc88df6da023dfff370cd965151a5afd7f; From a1e59abf824969554b90facd44a4ab16e265afa4 · fixed in dc0abce055134cb83b0d981d31ceb20dda419787; From a1e59abf824969554b90facd44a4ab16e265afa4 · fixed in c7221e7bd8fc2ef38a0b27be580d9d202281306b; From a1e59abf824969554b90facd44a4ab16e265afa4 · fixed in 3dcd1664ac15eee6a690daec7c4ffc59190406f7; From a1e59abf824969554b90facd44a4ab16e265afa4 · fixed in 1799d8abeabc68ec05679292aaf6cba93b343c05

  • Linux Linux

    2.6.19

  • KernelLinux

    From 2.6.19 · fixed in 5.10.252; From 5.11.0 · fixed in 5.15.202; From 5.16.0 · fixed in 6.1.165; From 6.2.0 · fixed in 6.6.128; From 6.7.0 · fixed in 6.12.75; From 6.13.0 · fixed in 6.18.16; From 6.19.0 · fixed in 6.19.6

References 8

git.kernel.org