tipc: prevent snt_unacked underflow on CONN_ACK
In the Linux kernel, the following vulnerability has been resolved: tipc: prevent snt_unacked underflow on CONN_ACK tipc_sk_conn_proto_rcv() subtracts the peer-supplied connection ack count from the unsigned 16-bit send counter snt_unacked without checking that it does not exceed the number of messages actually outstanding: tsk->snt_unacked -= msg_conn_ack(hdr); msg_conn_ack() is read straight from a received CONN_MANAGER/CONN_ACK message. If the ack count is larger than snt_unacked, the subtraction wraps to a near-maximum value, leaving tsk_conn_cong() permanently true and starving the connection of further transmits. Validate the ACK count at the start of the CONN_ACK block and drop the message if it acknowledges more messages than are outstanding. A peer (or, for a local connection, the connected peer socket) can otherwise wedge a TIPC connection's send side by sending an oversized connection ack.
CVE-2026-74282
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-2026-74282
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": "10724cc7bb7832b482df049c20fd824d928c5eaa",
"lessThan": "3388145d258cf2c4c98278e3987296007d30672e",
"versionType": "git"
},
{
"status": "affected",
"version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
"lessThan": "67e55b054bf8025658dc0e255057f2a6236416bd",
"versionType": "git"
},
{
"status": "affected",
"version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
"lessThan": "96f91b8ae1a489b3eca137e7acf42cf985fb8939",
"versionType": "git"
},
{
"status": "affected",
"version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
"lessThan": "47ed873e4ceda34098bd46d8e96b4bb13cad3a04",
"versionType": "git"
},
{
"status": "affected",
"version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
"lessThan": "b44bebdd32c9ff66ee2aebfc317ced44bedd9335",
"versionType": "git"
},
{
"status": "affected",
"version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
"lessThan": "3cfa3d8e0dc167850edeb5bf5a07757db83fd54e",
"versionType": "git"
},
{
"status": "affected",
"version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
"lessThan": "1e2c956745777e6ffdee7f30da5935741c03ee1e",
"versionType": "git"
},
{
"status": "affected",
"version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
"lessThan": "ab3e10b44ba5411779aac7afd2477917dd77750f",
"versionType": "git"
}
],
"programFiles": [
"net/tipc/socket.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/tipc/socket.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74282
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33081 · Revision 1
- Added to Heist Feed
- Publisher date