rxrpc: proc: size address buffers for %pISpc output

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Summary

CVECVE-2026-31630
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:42 UTC
Updated2026-04-24 17:51:40 UTC
DescriptionIn 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 75b54cb57ca34cbe7a87c6ac757c55360a624590 db297c78ce537c9ac96f0eda9b25ad72c8caefa9 git Not specified
CNA Linux Linux affected 75b54cb57ca34cbe7a87c6ac757c55360a624590 10ebed83f9f6414af4e85bc85ffaeda7effdd874 git Not specified
CNA Linux Linux affected 75b54cb57ca34cbe7a87c6ac757c55360a624590 a44ce6aa2efb61fe44f2cfab72bb01544bbca272 git Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/db297c78ce537c9ac96f0eda9b25ad72c8caefa9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a44ce6aa2efb61fe44f2cfab72bb01544bbca272 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/10ebed83f9f6414af4e85bc85ffaeda7effdd874 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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