7.8

CVE-2026-23001: macvlan: fix possible UAF in macvlan_forward_source()

Modified
AliasesUBUNTU-CVE-2026-23001DEBIAN-CVE-2026-23001
Published 25-01-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-23001 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.21%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 66 · Related 48
DLA-4475-1DLA-4476-1DSA-6126-1DSA-6127-1OPENSUSE-SU-2026:20287-1RHSA-2026:10996

Timeline

  1. 25-01-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.21% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-176.186 | < 6.8.0-117.117
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1105.112 | < 6.8.0-1055.58
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 79cf79abce71eb7dbc40e2f3121048ca5405cb47, < 8133e85b8a3ec9f10d861e0002ec6037256e987e | ≥ 79cf79abce71eb7dbc40e2f3121048ca5405cb47, < 484919832e2db6ce1e8add92c469e5d459a516b5 | ≥ 79cf79abce71eb7dbc40e2f3121048ca5405cb47, < 232afc74a6dde0fe1830988e5827921f5ec9bb3f | ≥ 79cf79abce71eb7dbc40e2f3121048ca5405cb47, < 15f6faf36e162532bec5cc05eb3fc622108bf2ed | ≥ 79cf79abce71eb7dbc40e2f3121048ca5405cb47, < 8518712a2ca952d6da2238c6f0a16b4ae5ea3f13 | ≥ 79cf79abce71eb7dbc40e2f3121048ca5405cb47, < 6dbead9c7677186f22b7981dd085a0feec1f038e | ≥ 79cf79abce71eb7dbc40e2f3121048ca5405cb47, < 7470a7a63dc162f07c26dbf960e41ee1e248d80e | 3.18
  • linux_kernel≥ 3.18.1, < 5.10.249 | ≥ 5.11, < 5.15.199 | ≥ 5.16, < 6.1.162 | ≥ 6.2, < 6.6.122 | ≥ 6.7, < 6.12.67 | ≥ 6.13, < 6.18.7 | 3.18 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5 | 6.19:rc6 | 6.19:rc7 | 6.19:rc8
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.8-1

3 vendors · 159 products

References

40 links
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