CVE-2026-64048

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
41st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 19, 2026

Last Modified

September 2, 2026

Advisory Details (6)

Auto-updated Jul 21, 2026
Patch available.
generic

net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0
generic

net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/afa9036b8c9963947b487c36e332df6a42c96fcb
generic

net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6927cacf2b10d4fa80c1a2d407512ef9397c59c6
generic

net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e
generic

net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/53eb7bd09aace72fa17510d80e0caf5ca058c231
generic

net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/277740023def559a4a2ddc3e8e784ee37a0f16a9

Vendor Advisories for CVE-2026-64048(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(22)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-10-01ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16~24.04.1) @ noble2026-10-01ubuntu
ubuntulinux-virtual-6.8 (6.8.0-139.139) @ noble2026-10-01ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-01ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1067.75) @ noble2026-10-01ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2053.55) @ noble2026-10-01ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1067.75+fips1) @ noble2026-10-01ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-10-01ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1036.37) @ noble2026-10-01ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1067.75~22.04.1) @ jammy2026-10-01ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1061.64~22.04.1) @ jammy2026-10-01ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-139.139.1) @ noble2026-10-01ubuntu
ubuntulinux-tools-oracle-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-01ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1064.67) @ noble2026-10-01ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-10-01ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-10-01ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-10-01ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-10-01ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1064.67+fips1) @ noble2026-10-01ubuntu
redhatkernel-rt-0:4.18.0-553.157.1.rt7.498.el8_102026-08-20redhat
redhatkernel-0:4.18.0-553.157.1.el8_102026-08-20redhat
redhatkernel-0:5.14.0-687.41.1.el9_82026-08-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)
  • every version up to 6.1.176-1: fixed in 6.1.176-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (142 versions)
  • every version up to 7.0.12-1: fixed in 7.0.12-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(19)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 55× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 298 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-02 17:56 UTCEPSS rescore
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-10-01 08:42 UTCEG score recompute
  11. 2026-10-01 08:42 UTCVendor advisory
  12. 2026-10-01 08:42 UTCGHSA enrichment
  13. 2026-09-30 15:03 UTCEPSS rescore
  14. 2026-09-28 13:51 UTCEPSS rescore
  15. 2026-09-28 07:22 UTCEG score recompute
  16. 2026-09-28 07:22 UTCVendor advisory
  17. 2026-09-28 07:22 UTCGHSA enrichment
  18. 2026-09-26 15:59 UTCEPSS rescore
  19. 2026-09-24 03:37 UTCEG score recompute
  20. 2026-09-24 03:37 UTCVendor advisory
  21. 2026-09-24 03:37 UTCGHSA enrichment
  22. 2026-09-23 17:54 UTCEPSS rescore
  23. 2026-09-23 01:59 UTCEG score recompute
  24. 2026-09-23 01:59 UTCVendor advisory
  25. 2026-09-23 01:59 UTCGHSA enrichment
Show 75 more
  1. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 04:16 UTCEG score recompute
  4. 2026-09-18 04:16 UTCVendor advisory
  5. 2026-09-18 04:16 UTCGHSA enrichment
  6. 2026-09-17 05:28 UTCEG score recompute
  7. 2026-09-17 05:28 UTCVendor advisory
  8. 2026-09-17 05:28 UTCGHSA enrichment
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 12:58 UTCEG score recompute
  11. 2026-09-16 12:58 UTCVendor advisory
  12. 2026-09-16 12:58 UTCGHSA enrichment
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-14 10:53 UTCVendor advisory
  15. 2026-09-14 10:53 UTCGHSA enrichment
  16. 2026-09-13 22:56 UTCEG score recompute
  17. 2026-09-13 22:56 UTCVendor advisory
  18. 2026-09-13 22:56 UTCGHSA enrichment
  19. 2026-09-13 07:37 UTCVendor advisory
  20. 2026-09-13 07:37 UTCGHSA enrichment
  21. 2026-09-12 19:39 UTCEG score recompute
  22. 2026-09-12 19:39 UTCVendor advisory
  23. 2026-09-12 19:39 UTCGHSA enrichment
  24. 2026-09-12 07:15 UTCVendor advisory
  25. 2026-09-12 07:14 UTCGHSA enrichment
  26. 2026-09-11 18:46 UTCEG score recompute
  27. 2026-09-11 18:46 UTCVendor advisory
  28. 2026-09-11 18:45 UTCGHSA enrichment
  29. 2026-09-11 14:53 UTCEPSS rescore
  30. 2026-09-11 09:37 UTCEPSS rescore
  31. 2026-09-08 22:01 UTCEPSS rescore
  32. 2026-09-07 23:17 UTCEG score recompute
  33. 2026-09-07 23:17 UTCVendor advisory
  34. 2026-09-07 23:17 UTCGHSA enrichment
  35. 2026-09-07 16:01 UTCEPSS rescore
  36. 2026-09-06 13:47 UTCEPSS rescore
  37. 2026-09-06 12:53 UTCVendor advisory
  38. 2026-09-06 12:52 UTCGHSA enrichment
  39. 2026-09-05 21:58 UTCEG score recompute
  40. 2026-09-05 21:58 UTCVendor advisory
  41. 2026-09-05 21:58 UTCGHSA enrichment
  42. 2026-09-05 15:31 UTCEPSS rescore
  43. 2026-09-05 09:56 UTCEG score recompute
  44. 2026-09-05 09:56 UTCVendor advisory
  45. 2026-09-05 09:56 UTCGHSA enrichment
  46. 2026-09-04 05:07 UTCEPSS rescore
  47. 2026-09-02 21:11 UTCEG score recompute
  48. 2026-09-02 21:11 UTCVendor advisory
  49. 2026-09-02 21:11 UTCGHSA enrichment
  50. 2026-09-02 14:12 UTCEPSS rescore
  51. 2026-09-01 13:54 UTCEPSS rescore
  52. 2026-09-01 04:40 UTCEPSS rescore
  53. 2026-08-31 03:34 UTCEG score recompute
  54. 2026-08-31 03:34 UTCVendor advisory
  55. 2026-08-31 03:34 UTCGHSA enrichment
  56. 2026-08-30 19:17 UTCEPSS rescore
  57. 2026-08-30 15:36 UTCVendor advisory
  58. 2026-08-30 15:36 UTCGHSA enrichment
  59. 2026-08-30 02:51 UTCEG score recompute
  60. 2026-08-30 02:51 UTCVendor advisory
  61. 2026-08-30 02:51 UTCGHSA enrichment
  62. 2026-08-30 01:22 UTCEPSS rescore
  63. 2026-08-28 21:42 UTCEPSS rescore
  64. 2026-08-28 01:42 UTCEG score recompute
  65. 2026-08-28 01:42 UTCVendor advisory
  66. 2026-08-28 01:42 UTCGHSA enrichment
  67. 2026-08-27 13:44 UTCVendor advisory
  68. 2026-08-27 13:44 UTCGHSA enrichment
  69. 2026-08-27 01:38 UTCEG score recompute
  70. 2026-08-27 01:38 UTCVendor advisory
  71. 2026-08-27 01:38 UTCGHSA enrichment
  72. 2026-08-26 14:46 UTCEPSS rescore
  73. 2026-08-26 13:42 UTCVendor advisory
  74. 2026-08-26 13:41 UTCGHSA enrichment
  75. 2026-08-26 01:18 UTCEG score recompute

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-64048?
CVE-2026-64048 is a high vulnerability published on July 19, 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->ismdev[]/ini->ismchid[] is reserved for an SMC-Dv1 device. smcfindismv2device_clnt() populates V2 entries starting at index 1, so…
When was CVE-2026-64048 disclosed?
CVE-2026-64048 was first published on July 19, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64048 actively exploited?
CVE-2026-64048 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-64048?
CVE-2026-64048 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-64048?
A fix for CVE-2026-64048 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-64048 are linked in the Vendor Advisories panel on this page.

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