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HIGHCVE-2026-23001Published Modified CNA Linux

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

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

Metrics

CVSS v3.1
7.8
Severity
HIGH
Fixed in
0
Affected Products
2

Fix available

015f6faf36e162532bec5cc05eb3fc622108bf2ed232afc74a6dde0fe1830988e5827921f5ec9bb3f484919832e2db6ce1e8add92c469e5d459a516b55.10.2495.15.1996.1.1626.6.1226.12.676.18.76.196dbead9c7677186f22b7981dd085a0feec1f038e7470a7a63dc162f07c26dbf960e41ee1e248d80e8133e85b8a3ec9f10d861e0002ec6037256e987e8518712a2ca952d6da2238c6f0a16b4ae5ea3f13
Affected packages
  • Linux / Linux
    < 8133e85b8a3ec9f10d861e0002ec6037256e987e (from 79cf79abce71eb7dbc40e2f3121048ca5405cb47) · < 484919832e2db6ce1e8add92c469e5d459a516b5 (from 79cf79abce71eb7dbc40e2f3121048ca5405cb47) · < 232afc74a6dde0fe1830988e5827921f5ec9bb3f (from 79cf79abce71eb7dbc40e2f3121048ca5405cb47) · < 15f6faf36e162532bec5cc05eb3fc622108bf2ed (from 79cf79abce71eb7dbc40e2f3121048ca5405cb47) · < 8518712a2ca952d6da2238c6f0a16b4ae5ea3f13 (from 79cf79abce71eb7dbc40e2f3121048ca5405cb47) · < 6dbead9c7677186f22b7981dd085a0feec1f038e (from 79cf79abce71eb7dbc40e2f3121048ca5405cb47)
  • Linux / Linux
    3.18
    Fixed in 0, 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References