net/smc: do not dereference an unset send buffer on the SMC-D teardown path
In the Linux kernel, the following vulnerability has been resolved: net/smc: do not dereference an unset send buffer on the SMC-D teardown path smc_close_stream_wait() calls smc_tx_prepared_sends() from inside its sk_wait_event() condition, and sk_wait_event() evaluates that condition once with the socket lock released. smcd_buf_detach() clears conn->sndbuf_desc from smc_conn_kill() under lock_sock(), so a link group terminating while a socket waits there leaves the helper dereferencing NULL, faulting out of close(). SIOCOUTQ reads the field by hand, and smc_close_cancel_work() drops the lock across two cancel_*_sync() calls. Sample the pointer once in the helper, report nothing prepared while it is unset, and bound the ioctl the same way. The receive tasklet dereferences the field directly in smc_cdc_msg_recv_action(), not through this helper; 1/2 is what keeps it from running that late.
CVE-2026-80984
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-2026-80984
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": "21f6f41e82e59740e26e06e77bdf58dc7f6f08dd",
"lessThan": "ab26e12dd5d2f43d939fcf456933a816e81d2e51",
"versionType": "git"
},
{
"status": "affected",
"version": "ae2be35cbed2c8385e890147ea321a3fcc3ca5fa",
"lessThan": "e3fcff8d22a6c9540748846cd800443a643553a6",
"versionType": "git"
},
{
"status": "affected",
"version": "ae2be35cbed2c8385e890147ea321a3fcc3ca5fa",
"lessThan": "f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45",
"versionType": "git"
},
{
"status": "affected",
"version": "ae2be35cbed2c8385e890147ea321a3fcc3ca5fa",
"lessThan": "f517cf02033801a28f98d86ca613a3533cf066b3",
"versionType": "git"
},
{
"status": "affected",
"version": "ae2be35cbed2c8385e890147ea321a3fcc3ca5fa",
"lessThan": "b395dd319cea422239cb45b998fb38d7e373af87",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.66",
"lessThan": "6.6.157",
"versionType": "semver"
}
],
"programFiles": [
"net/smc/af_smc.c",
"net/smc/smc_tx.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.10",
"versionType": "semver"
},
{
"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/af_smc.c",
"net/smc/smc_tx.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80984
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34941 · Revision 1
- Added to Heist Feed
- Publisher date