CVE-2026-31630 (GCVE-0-2026-31630)
Vulnerability from cvelistv5
Published
2026-04-24 14:44
Modified
2026-10-21 12:39
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
Impacted products
Vendor Product Version
Linux Linux Version: 75b54cb57ca34cbe7a87c6ac757c55360a624590
Version: 75b54cb57ca34cbe7a87c6ac757c55360a624590
Version: 75b54cb57ca34cbe7a87c6ac757c55360a624590
Version: 75b54cb57ca34cbe7a87c6ac757c55360a624590
Version: 75b54cb57ca34cbe7a87c6ac757c55360a624590
Version: 75b54cb57ca34cbe7a87c6ac757c55360a624590
Version: 75b54cb57ca34cbe7a87c6ac757c55360a624590
Version: 75b54cb57ca34cbe7a87c6ac757c55360a624590
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    "dateReserved": "2026-03-09T15:48:24.124Z",
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The attacker can retrigger it repeatedly by reading the affected proc entries while the crafted address object exists.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"75b54cb57ca34cbe7a87c6ac757c55360a624590\", \"lessThan\": \"386c86412608d3449006a318a662cbcd6ca1f668\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"75b54cb57ca34cbe7a87c6ac757c55360a624590\", \"lessThan\": \"235b2115de892eab2e107a42efa7a4347baaa80b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"75b54cb57ca34cbe7a87c6ac757c55360a624590\", \"lessThan\": \"625af53a1564e31bb2df9adc3739df46137f46c1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"75b54cb57ca34cbe7a87c6ac757c55360a624590\", \"lessThan\": \"808a34cdbe8ce336c202d8ea6d5e48496764dc37\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"75b54cb57ca34cbe7a87c6ac757c55360a624590\", \"lessThan\": \"a6042b8066b24dbcc7945616a157d4d43e463668\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"75b54cb57ca34cbe7a87c6ac757c55360a624590\", \"lessThan\": \"db297c78ce537c9ac96f0eda9b25ad72c8caefa9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"75b54cb57ca34cbe7a87c6ac757c55360a624590\", \"lessThan\": \"10ebed83f9f6414af4e85bc85ffaeda7effdd874\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"75b54cb57ca34cbe7a87c6ac757c55360a624590\", \"lessThan\": \"a44ce6aa2efb61fe44f2cfab72bb01544bbca272\", \"versionType\": \"git\"}], \"programFiles\": [\"net/rxrpc/proc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.114\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/rxrpc/proc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/386c86412608d3449006a318a662cbcd6ca1f668\"}, {\"url\": \"https://git.kernel.org/stable/c/235b2115de892eab2e107a42efa7a4347baaa80b\"}, {\"url\": \"https://git.kernel.org/stable/c/625af53a1564e31bb2df9adc3739df46137f46c1\"}, {\"url\": \"https://git.kernel.org/stable/c/808a34cdbe8ce336c202d8ea6d5e48496764dc37\"}, {\"url\": \"https://git.kernel.org/stable/c/a6042b8066b24dbcc7945616a157d4d43e463668\"}, {\"url\": \"https://git.kernel.org/stable/c/db297c78ce537c9ac96f0eda9b25ad72c8caefa9\"}, {\"url\": \"https://git.kernel.org/stable/c/10ebed83f9f6414af4e85bc85ffaeda7effdd874\"}, {\"url\": \"https://git.kernel.org/stable/c/a44ce6aa2efb61fe44f2cfab72bb01544bbca272\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.160\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.114\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.23\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.13\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-21T12:39:36.441Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31630\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-21T12:39:36.441Z\", \"dateReserved\": \"2026-03-09T15:48:24.124Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-24T14:44:46.606Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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