AZL-83825
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-83825.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-83825
- Upstream
- Published
- 2026-04-24T15:16:42Z
- Modified
- 2026-09-05T05:27:51Z
- Summary
- CVE-2026-31630 affecting package kernel 6.6.150.1-1
- Details
-
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
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