net: smc: fix splice entry lifetime imbalance in smc_rx_splice
In the Linux kernel, the following vulnerability has been resolved: net: smc: fix splice entry lifetime imbalance in smc_rx_splice smc_rx_splice() passes pages to splice_to_pipe() before taking the references that cover the lifetime of each splice entry. In the VM-backed RMB path, splice_to_pipe() may drop unqueued entries through smc_rx_spd_release(), while queued entries are released later via the pipe buffer callback. The old post-splice accounting also derives the number of queued VM pages from an offset mutated while building the descriptor, and a multi-page splice pairs one sock_hold() with multiple sock_put() calls. Take the page and socket references for every candidate entry before splice_to_pipe(), and drop the matching private state, page reference, and socket reference from smc_rx_spd_release() for entries that never get queued. This fixes a refcount imbalance that can underflow page refcounts and trigger a use-after-free.
CVE-2026-74631
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-2026-74631
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": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "07ad246529d136d5ef441d5ab4c305d132ff3090",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "c841789e456ec6751342fa800639ce8e82ff0e6b",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "af02c67ce654356c58db20a0bb2db33ace3b07a8",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "ca8342b5fc24c249fdb998468f6a168b457c67e5",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "4515c78f4d9fd577270f012efeb062ea58b3682d",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "5d9686af2976741bbd79b150d1c9e60b81e7f12e",
"versionType": "git"
}
],
"programFiles": [
"net/smc/smc_rx.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/smc/smc_rx.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74631
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34251 · Revision 1
- Added to Heist Feed
- Publisher date