sctp: fix stream->outcnt underflow on duplicate RECONF responses
In the Linux kernel, the following vulnerability has been resolved: sctp: fix stream->outcnt underflow on duplicate RECONF responses A cached RECONF chunk may contain more than one request parameter. A duplicate response can therefore find and process the same ADD_OUT request again while another parameter is still outstanding, rolling back outcnt twice and possibly underflowing it. Track outstanding request types as bits and clear each bit after its first response. Later responses for the same request are then ignored.
CVE-2026-89476
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-2026-89476
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": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3",
"lessThan": "041f7df5a929d3e7435dd8387e8ea17f2d412b7d",
"versionType": "git"
},
{
"status": "affected",
"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3",
"lessThan": "59f61c39cb99ee1737bd742a20094fe5653389bb",
"versionType": "git"
},
{
"status": "affected",
"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3",
"lessThan": "793519e343867ee9a3e84f6cac07f81f2aec7b5d",
"versionType": "git"
},
{
"status": "affected",
"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3",
"lessThan": "092acd3c55a4077b00489064615d8d2d898daf91",
"versionType": "git"
},
{
"status": "affected",
"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3",
"lessThan": "2d867663c563e8009257b9edf9c8ec75d9bbf19a",
"versionType": "git"
},
{
"status": "affected",
"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3",
"lessThan": "d02a5794c3deedcb8476d017fcee2b7aaedab2e1",
"versionType": "git"
},
{
"status": "affected",
"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3",
"lessThan": "8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68",
"versionType": "git"
},
{
"status": "affected",
"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3",
"lessThan": "3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e",
"versionType": "git"
}
],
"programFiles": [
"include/net/sctp/structs.h",
"net/sctp/stream.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/sctp/structs.h",
"net/sctp/stream.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89476
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35004 · Revision 1
- Added to Heist Feed
- Publisher date