rxrpc: Only put the call ref if one was acquired
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Only put the call ref if one was acquired rxrpc_input_packet_on_conn() can process a to-client packet after the current client call on the channel has already been torn down. In that case chan->call is NULL, rxrpc_try_get_call() returns NULL and there is no reference to drop. The client-side implicit-end error path does not account for that and unconditionally calls rxrpc_put_call(). This turns a protocol error path into a kernel crash instead of rejecting the packet. Only drop the call reference if one was actually acquired. Keep the existing protocol error handling unchanged.
CVE-2026-31638
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-2026-31638
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": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"lessThan": "b8f66447448d6c305a51413a67ec8ed26aa7d1dd",
"versionType": "git"
},
{
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"lessThan": "0c156aff8a2d4fa0d61db7837641975cf0e5452d",
"versionType": "git"
},
{
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"lessThan": "8299ca146489664e3c0c90a3b8900d8335b1ede4",
"versionType": "git"
},
{
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"lessThan": "9fb09861e2b8d1abfe2efaf260c9f1d30080ea38",
"versionType": "git"
},
{
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"lessThan": "6331f1b24a3e85465f6454e003a3e6c22005a5c5",
"versionType": "git"
}
],
"programFiles": [
"net/rxrpc/io_thread.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.135",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.82",
"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/io_thread.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31638
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39935 · Revision 1
- Added to Heist Feed
- Publisher date