Answer in brief
CVE-2026-64048 records a Unknown severity vulnerability in net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <6927cacf2b10d4fa80c1a2d407512ef9397c59c6 || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0 || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <53eb7bd09aace72fa17510d80e0caf5ca058c231 || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <afa9036b8c9963947b487c36e332df6a42c96fcb || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <277740023def559a4a2ddc3e8e784ee37a0f16a9 | 6927cacf2b10d4fa80c1a2d407512ef9397c59c6, d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0, 53eb7bd09aace72fa17510d80e0caf5ca058c231, afa9036b8c9963947b487c36e332df6a42c96fcb, 65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e, 277740023def559a4a2ddc3e8e784ee37a0f16a9 |
| Linux/Linuxgeneric | 5.10 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64048 records a Unknown severity vulnerability in net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <6927cacf2b10d4fa80c1a2d407512ef9397c59c6 || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0 || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <53eb7bd09aace72fa17510d80e0caf5ca058c231 || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <afa9036b8c9963947b487c36e332df6a42c96fcb || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e || >=a7c9c5f4af7f6098da68705fc5d86565d0728ef7 <277740023def559a4a2ddc3e8e784ee37a0f16a9 | 6927cacf2b10d4fa80c1a2d407512ef9397c59c6, d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0, 53eb7bd09aace72fa17510d80e0caf5ca058c231, afa9036b8c9963947b487c36e332df6a42c96fcb, 65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e, 277740023def559a4a2ddc3e8e784ee37a0f16a9 |
| Linux/Linuxgeneric | 5.10 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.