rxrpc: proc: size address buffers for %pISpc output
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
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
- Added to Heist Feed
- Publisher date