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rxrpc: proc: size address buffers for %pISpc output

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-31630

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-2026-31630

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": "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"
  }
]
Related CVEs
CVE-2026-31630

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#46235 · Revision 1
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Publisher date
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