RDMA/ucma: Serialize join and leave on copy_to_user failure
In the Linux kernel, the following vulnerability has been resolved: RDMA/ucma: Serialize join and leave on copy_to_user failure rdma_join_multicast() queues RoCE work that later reads the ucma_multicast through event->param.ud.private_data, then list_add()s the CMA multicast at the head of id_priv->mc_list. rdma_leave_multicast() matches only by sockaddr and destroys the first hit. ucma_process_join() used to drop ctx->mutex after a successful join and retake it only if copy_to_user() failed. Two concurrent JOIN_MCAST calls with the same address can therefore insert a second CMA entry before the first thread's leave. leave then cancels the newer work and the older worker still dereferences the ucma_multicast that the first thread frees. Keep ctx->mutex held from rdma_join_multicast() through copy_to_user() and, on -EFAULT, through rdma_leave_multicast() so leave cannot miss this join. Do not leave if join itself failed: that path never published this address on mc_list, and a leave-by-addr would destroy an earlier successful join.
CVE-2026-98253
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-2026-98253
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": "60d613b39e8d0c9f3b526e9c96445422b4562d76",
"lessThan": "29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9",
"versionType": "git"
},
{
"status": "affected",
"version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
"lessThan": "52172e11bd074ccaded21740ffeb67123f01dd00",
"versionType": "git"
},
{
"status": "affected",
"version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
"lessThan": "01e29d0d78a8f66f221625720a04939eef5ec1f6",
"versionType": "git"
},
{
"status": "affected",
"version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
"lessThan": "ae805d204cf1f15b87d1bf3529b4c649f3519420",
"versionType": "git"
},
{
"status": "affected",
"version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
"lessThan": "43c4e24bd10370fc976f6220518049ce71419399",
"versionType": "git"
},
{
"status": "affected",
"version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
"lessThan": "01cbdb724c584d7772fd25af2e4dfdf8527ce0d5",
"versionType": "git"
},
{
"status": "affected",
"version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
"lessThan": "83610ee5e498fa5bfcb80031d2b959baea276bf6",
"versionType": "git"
},
{
"status": "affected",
"version": "fe454dc31e84f8c14cb8942fcb61666c9f40745b",
"lessThan": "662ade4de9ff5eceb0820a9f8e9fac70ba6a815b",
"versionType": "git"
},
{
"status": "affected",
"version": "a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.20",
"lessThan": "5.10.271",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.11.3",
"lessThan": "5.12",
"versionType": "semver"
}
],
"programFiles": [
"drivers/infiniband/core/ucma.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/infiniband/core/ucma.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98253
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #38332 · Revision 1
- Added to Heist Feed
- Publisher date