Vulnerability-Lookup

FKIE_CVE-2026-31630

Vulnerability from fkie_nvd - Published: 2026-04-24 15:16 - Updated: 2026-06-01 17:16

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: rxrpc: proc: size address buffers for %pISpc output The AF_RXRPC procfs helpers format local and remote socket addresses into fixed 50-byte stack buffers with "%pISpc". That is too small for the longest current-tree IPv6-with-port form the formatter can produce. In lib/vsprintf.c, the compressed IPv6 path uses a dotted-quad tail not only for v4mapped addresses, but also for ISATAP addresses via ipv6_addr_is_isatap(). As a result, a case such as [ffff:ffff:ffff:ffff:0:5efe:255.255.255.255]:65535 is possible with the current formatter. That is 50 visible characters, so 51 bytes including the trailing NUL, which does not fit in the existing char[50] buffers used by net/rxrpc/proc.c. Size the buffers from the formatter's maximum textual form and switch the call sites to scnprintf(). Changes since v1: - correct the changelog to cite the actual maximum current-tree case explicitly - frame the proof around the ISATAP formatting path instead of the earlier mapped-v4 example

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/10ebed83f9f6414af4e85bc85ffaeda7effdd874	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/235b2115de892eab2e107a42efa7a4347baaa80b
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/386c86412608d3449006a318a662cbcd6ca1f668
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/625af53a1564e31bb2df9adc3739df46137f46c1
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a44ce6aa2efb61fe44f2cfab72bb01544bbca272	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/db297c78ce537c9ac96f0eda9b25ad72c8caefa9	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	4.9
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
linux	linux_kernel	7.0

JSON

To clipboard

{
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: proc: size address buffers for %pISpc output\n\nThe AF_RXRPC procfs helpers format local and remote socket addresses into\nfixed 50-byte stack buffers with \"%pISpc\".\n\nThat is too small for the longest current-tree IPv6-with-port form the\nformatter can produce. In lib/vsprintf.c, the compressed IPv6 path uses a\ndotted-quad tail not only for v4mapped addresses, but also for ISATAP\naddresses via ipv6_addr_is_isatap().\n\nAs a result, a case such as\n\n  [ffff:ffff:ffff:ffff:0:5efe:255.255.255.255]:65535\n\nis possible with the current formatter. That is 50 visible characters, so\n51 bytes including the trailing NUL, which does not fit in the existing\nchar[50] buffers used by net/rxrpc/proc.c.\n\nSize the buffers from the formatter\u0027s maximum textual form and switch the\ncall sites to scnprintf().\n\nChanges since v1:\n- correct the changelog to cite the actual maximum current-tree case\n  explicitly\n- frame the proof around the ISATAP formatting path instead of the earlier\n  mapped-v4 example"
    }
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  "lastModified": "2026-06-01T17:16:54.030",
  "metrics": {
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}

CVE-2026-31630 (GCVE-0-2026-31630)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:44 – Updated: 2026-06-01 16:13

Title

rxrpc: proc: size address buffers for %pISpc output

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

6 references

URL	Tags
https://git.kernel.org/stable/c/386c86412608d3449…
https://git.kernel.org/stable/c/235b2115de892eab2…
https://git.kernel.org/stable/c/625af53a1564e31bb…
https://git.kernel.org/stable/c/db297c78ce537c9ac…
https://git.kernel.org/stable/c/10ebed83f9f6414af…
https://git.kernel.org/stable/c/a44ce6aa2efb61fe4…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 75b54cb57ca34cbe7a87c6ac757c55360a624590 , < 386c86412608d3449006a318a662cbcd6ca1f668 (git) Affected: 75b54cb57ca34cbe7a87c6ac757c55360a624590 , < 235b2115de892eab2e107a42efa7a4347baaa80b (git) Affected: 75b54cb57ca34cbe7a87c6ac757c55360a624590 , < 625af53a1564e31bb2df9adc3739df46137f46c1 (git) Affected: 75b54cb57ca34cbe7a87c6ac757c55360a624590 , < db297c78ce537c9ac96f0eda9b25ad72c8caefa9 (git) Affected: 75b54cb57ca34cbe7a87c6ac757c55360a624590 , < 10ebed83f9f6414af4e85bc85ffaeda7effdd874 (git) Affected: 75b54cb57ca34cbe7a87c6ac757c55360a624590 , < a44ce6aa2efb61fe44f2cfab72bb01544bbca272 (git)
Linux	Linux	Affected: 4.9 Unaffected: 0 , < 4.9 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.18.23 , ≤ 6.18.* (semver) Unaffected: 6.19.13 , ≤ 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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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-2026-31630

CVE-2026-31630 (GCVE-0-2026-31630)

Tags

Sightings

Nomenclature