net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot
In the Linux kernel, the following vulnerability has been resolved: net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot On the SMC-D client, slot 0 of ini->ism_dev[]/ini->ism_chid[] is reserved for an SMC-Dv1 device. smc_find_ism_v2_device_clnt() populates V2 entries starting at index 1, so when no V1 device is selected slot 0 is left in its kzalloc()'ed state with ism_dev[0] == NULL and ism_chid[0] == 0. smc_v2_determine_accepted_chid() then matches the peer's CHID against the array starting from index 0 using the CHID alone. A malicious peer replying to a SMC-Dv2-only proposal with d1.chid == 0 matches the empty slot, ini->ism_selected becomes 0, and the subsequent ism_dev[0]->lgr_lock dereference in smc_conn_create() faults at offsetof(struct smcd_dev, lgr_lock) == 0x68: BUG: KASAN: null-ptr-deref in _raw_spin_lock_bh+0x79/0xe0 Write of size 4 at addr 0000000000000068 by task exploit/144 Call Trace: _raw_spin_lock_bh smc_conn_create (net/smc/smc_core.c:1997) __smc_connect (net/smc/af_smc.c:1447) smc_connect (net/smc/af_smc.c:1720) __sys_connect __x64_sys_connect do_syscall_64 Require ism_dev[i] to be non-NULL before accepting a CHID match.
CVE-2026-64048
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-2026-64048
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": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "903f7688ffeb9b323d70652c01f554bd4ba2a3d6",
"versionType": "git"
},
{
"status": "affected",
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "dd2f9dd83c68abd7ba7ded7075290b016cb7ecd0",
"versionType": "git"
},
{
"status": "affected",
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "6927cacf2b10d4fa80c1a2d407512ef9397c59c6",
"versionType": "git"
},
{
"status": "affected",
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0",
"versionType": "git"
},
{
"status": "affected",
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "53eb7bd09aace72fa17510d80e0caf5ca058c231",
"versionType": "git"
},
{
"status": "affected",
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "afa9036b8c9963947b487c36e332df6a42c96fcb",
"versionType": "git"
},
{
"status": "affected",
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e",
"versionType": "git"
},
{
"status": "affected",
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "277740023def559a4a2ddc3e8e784ee37a0f16a9",
"versionType": "git"
}
],
"programFiles": [
"net/smc/af_smc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.10",
"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": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/smc/af_smc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64048
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40946 · Revision 1
- Added to Heist Feed
- Publisher date