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xfrm6: fix uninitialized saddr in xfrm6_get_saddr()

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-43139

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-43139

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
        "lessThan": "4f28141786e1fe884ce42a5197ba9beed540f0ea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
        "lessThan": "6535867673bf301d52aa00593a4d1d18cc3922fa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
        "lessThan": "eb2ee15290af14c60b45cf2b73f5687d1d077d9b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
        "lessThan": "719918fc88df6da023dfff370cd965151a5afd7f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
        "lessThan": "dc0abce055134cb83b0d981d31ceb20dda419787",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
        "lessThan": "c7221e7bd8fc2ef38a0b27be580d9d202281306b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
        "lessThan": "3dcd1664ac15eee6a690daec7c4ffc59190406f7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
        "lessThan": "1799d8abeabc68ec05679292aaf6cba93b343c05",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv6/xfrm6_policy.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.252",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.202",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.165",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.128",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.75",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.16",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.6",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/xfrm6_policy.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43139

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40034 · Revision 1
Added to Heist Feed
Publisher date
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