Vulnerability-Lookup

FKIE_CVE-2026-31680

Vulnerability from fkie_nvd - Published: 2026-04-25 09:16 - Updated: 2026-05-06 21:23

Severity ?

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

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown `ip6fl_seq_show()` walks the global flowlabel hash under the seq-file RCU read-side lock and prints `fl->opt->opt_nflen` when an option block is present. Exclusive flowlabels currently free `fl->opt` as soon as `fl->users` drops to zero in `fl_release()`. However, the surrounding `struct ip6_flowlabel` remains visible in the global hash table until later garbage collection removes it and `fl_free_rcu()` finally tears it down. A concurrent `/proc/net/ip6_flowlabel` reader can therefore race that early `kfree()` and dereference freed option state, triggering a crash in `ip6fl_seq_show()`. Fix this by keeping `fl->opt` alive until `fl_free_rcu()`. That matches the lifetime already required for the enclosing flowlabel while readers can still reach it under RCU.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3c54b66c83fb8fcbde8e6a7bf90b65856e39f827	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/414726b69921fe6355ae453f5b35e68dd078342a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4b6798024f7b2d535f3db1002c760143cdbd1bd3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/572ce62778519a7d4d1c15f55dd2e45a474133c4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5a6b15f861b7c1304949e3350d23490a5fe429fd	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6c7fbdb8ffde6413640de7cfbd7c976c353e89f8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8027964931785cb73d520ac70a342a3dc16c249b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9ca562bb8e66978b53028fa32b1a190708e6a091	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
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

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    }
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          "confidentialityImpact": "HIGH",
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}

CVE-2026-31680 (GCVE-0-2026-31680)

Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-04-27 14:05

Title

net: ipv6: flowlabel: defer exclusive option free until RCU teardown

Summary

Severity ?

7.8 (High)


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

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/4b6798024f7b2d535…
	https://git.kernel.org/stable/c/3c54b66c83fb8fcbd…
	https://git.kernel.org/stable/c/5a6b15f861b7c1304…
	https://git.kernel.org/stable/c/6c7fbdb8ffde64136…
	https://git.kernel.org/stable/c/8027964931785cb73…
	https://git.kernel.org/stable/c/414726b69921fe635…
	https://git.kernel.org/stable/c/572ce62778519a7d4…
	https://git.kernel.org/stable/c/9ca562bb8e66978b5…

Impacted products

Vendor

Product

Version

Linux

Affected: d3aedd5ebd4b0b925b0bcda548066803e1318499 , < 4b6798024f7b2d535f3db1002c760143cdbd1bd3 (git)
Affected: d3aedd5ebd4b0b925b0bcda548066803e1318499 , < 3c54b66c83fb8fcbde8e6a7bf90b65856e39f827 (git)
Affected: d3aedd5ebd4b0b925b0bcda548066803e1318499 , < 5a6b15f861b7c1304949e3350d23490a5fe429fd (git)
Affected: d3aedd5ebd4b0b925b0bcda548066803e1318499 , < 6c7fbdb8ffde6413640de7cfbd7c976c353e89f8 (git)
Affected: d3aedd5ebd4b0b925b0bcda548066803e1318499 , < 8027964931785cb73d520ac70a342a3dc16c249b (git)
Affected: d3aedd5ebd4b0b925b0bcda548066803e1318499 , < 414726b69921fe6355ae453f5b35e68dd078342a (git)
Affected: d3aedd5ebd4b0b925b0bcda548066803e1318499 , < 572ce62778519a7d4d1c15f55dd2e45a474133c4 (git)
Affected: d3aedd5ebd4b0b925b0bcda548066803e1318499 , < 9ca562bb8e66978b53028fa32b1a190708e6a091 (git)

Linux

Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_flowlabel.c"
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        },
        {
          "url": "https://git.kernel.org/stable/c/414726b69921fe6355ae453f5b35e68dd078342a"
        },
        {
          "url": "https://git.kernel.org/stable/c/572ce62778519a7d4d1c15f55dd2e45a474133c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ca562bb8e66978b53028fa32b1a190708e6a091"
        }
      ],
      "title": "net: ipv6: flowlabel: defer exclusive option free until RCU teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31680",
    "datePublished": "2026-04-25T08:46:56.807Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-04-27T14:05:00.799Z",
    "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-2026-31680

CVE-2026-31680 (GCVE-0-2026-31680)

Tags

Sightings

Nomenclature