Vulnerability-Lookup

FKIE_CVE-2026-43139

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-05-13 18:41

Severity ?

8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

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.

References

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

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0

JSON

To clipboard

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CVE-2026-43139 (GCVE-0-2026-43139)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-11 22:18

Title

xfrm6: fix uninitialized saddr in xfrm6_get_saddr()

Summary

Severity ?

8.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/4f28141786e1fe884…
https://git.kernel.org/stable/c/6535867673bf301d5…
https://git.kernel.org/stable/c/eb2ee15290af14c60…
https://git.kernel.org/stable/c/719918fc88df6da02…
https://git.kernel.org/stable/c/dc0abce055134cb83…
https://git.kernel.org/stable/c/c7221e7bd8fc2ef38…
https://git.kernel.org/stable/c/3dcd1664ac15eee6a…
https://git.kernel.org/stable/c/1799d8abeabc68ec0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a1e59abf824969554b90facd44a4ab16e265afa4 , < 4f28141786e1fe884ce42a5197ba9beed540f0ea (git) Affected: a1e59abf824969554b90facd44a4ab16e265afa4 , < 6535867673bf301d52aa00593a4d1d18cc3922fa (git) Affected: a1e59abf824969554b90facd44a4ab16e265afa4 , < eb2ee15290af14c60b45cf2b73f5687d1d077d9b (git) Affected: a1e59abf824969554b90facd44a4ab16e265afa4 , < 719918fc88df6da023dfff370cd965151a5afd7f (git) Affected: a1e59abf824969554b90facd44a4ab16e265afa4 , < dc0abce055134cb83b0d981d31ceb20dda419787 (git) Affected: a1e59abf824969554b90facd44a4ab16e265afa4 , < c7221e7bd8fc2ef38a0b27be580d9d202281306b (git) Affected: a1e59abf824969554b90facd44a4ab16e265afa4 , < 3dcd1664ac15eee6a690daec7c4ffc59190406f7 (git) Affected: a1e59abf824969554b90facd44a4ab16e265afa4 , < 1799d8abeabc68ec05679292aaf6cba93b343c05 (git)
Linux	Linux	Affected: 2.6.19 Unaffected: 0 , < 2.6.19 (semver) Unaffected: 5.10.252 , ≤ 5.10.* (semver) Unaffected: 5.15.202 , ≤ 5.15.* (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.16 , ≤ 6.18.* (semver) Unaffected: 6.19.6 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "programFiles": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787"
        },
        {
          "url": "https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05"
        }
      ],
      "title": "xfrm6: fix uninitialized saddr in xfrm6_get_saddr()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43139",
    "datePublished": "2026-05-06T11:27:24.898Z",
    "dateReserved": "2026-05-01T14:12:55.988Z",
    "dateUpdated": "2026-05-11T22:18:30.795Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-43139

CVE-2026-43139 (GCVE-0-2026-43139)

Tags

Sightings

Nomenclature