7.5

CVE-2026-64048: linux NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2026-64048DEBIAN-CVE-2026-64048
Published 19-07-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-64048 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.50%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 39 · Related 36
OPENSUSE-SU-2026:21910-1RHSA-2026:57252RHSA-2026:57253RHSA-2026:57254SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

0.00 pp

From 0.50% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu155 products
  • linuxAll versions (No fix recorded) | < 6.8.0-139.139 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1064.67 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ a7c9c5f4af7f6098da68705fc5d86565d0728ef7, < 903f7688ffeb9b323d70652c01f554bd4ba2a3d6 | ≥ a7c9c5f4af7f6098da68705fc5d86565d0728ef7, < dd2f9dd83c68abd7ba7ded7075290b016cb7ecd0 | ≥ a7c9c5f4af7f6098da68705fc5d86565d0728ef7, < 6927cacf2b10d4fa80c1a2d407512ef9397c59c6 | ≥ a7c9c5f4af7f6098da68705fc5d86565d0728ef7, < d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0 | ≥ a7c9c5f4af7f6098da68705fc5d86565d0728ef7, < 53eb7bd09aace72fa17510d80e0caf5ca058c231 | ≥ a7c9c5f4af7f6098da68705fc5d86565d0728ef7, < afa9036b8c9963947b487c36e332df6a42c96fcb | ≥ a7c9c5f4af7f6098da68705fc5d86565d0728ef7, < 65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e | ≥ a7c9c5f4af7f6098da68705fc5d86565d0728ef7, < 277740023def559a4a2ddc3e8e784ee37a0f16a9 | 5.10
  • linux_kernel≥ 5.10, < 5.10.266 | ≥ 5.11, < 5.15.217 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.142 | ≥ 6.7, < 6.12.92 | ≥ 6.13, < 6.18.34 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1

3 vendors · 158 products

References

32 links
Show all 32 references