net/smc: fix use-after-free in smc_rx_pipe_buf_release()
In the Linux kernel, the following vulnerability has been resolved: net/smc: fix use-after-free in smc_rx_pipe_buf_release() smc_rx_splice() hands RMB pages to a pipe and takes a socket reference per entry so the smc_sock stays alive until the reader finishes. The connection does not: a concurrent close runs smc_conn_free(), which releases the receive buffer back to the link group pool. smc_rx_pipe_buf_release() tests sk_state before taking the socket lock. The state can change between the test and the lock, and smc_rx_update_cons() then dereferences conn->rmb_desc and walks conn->lgr, which smc_conn_free() has already released. On the is_reg_err path smcr_buf_unuse() frees the descriptor outright, so this is a use-after-free. Take the socket lock first and test conn->freed instead. smc_conn_free() sets that flag before releasing anything, and every caller holds the socket lock. The two paths exclude each other: either the pipe release runs first with everything valid, or it sees the flag and skips the update.
CVE-2026-80982
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-2026-80982
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": "dadd97c8296b23aa816e91ed70041820ae087baa",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "df441f3efbb50eb0f120b8de4bf441c31fb0551d",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "6a644a7340df978785f3109d1e0726a982ce2c6f",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "0761e49aa78c2f1362511054c6e9670653858837",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "0926f59ca0f94120895b92180c636a48d0ed3a6d",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "c924884743e948e25625b7fbf3ee2a9325a204a7",
"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": "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": [
"net/smc/smc_rx.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80982
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34940 · Revision 1
- Added to Heist Feed
- Publisher date