{"apiVersion":"1.0","identifier":"CVE-2026-74479","description":"In the Linux kernel, the following vulnerability has been resolved: net: pktgen: fix proc entry use-after-free pktgen_change_name() replaces pkt_dev->entry while holding t->if_lock. pktgen_remove_device() removes the same entry before _rem_dev_from_if_list() takes that lock. This allows the following interleaving: CPU 0 (NETDEV_CHANGENAME) CPU 1 (kpktgend) if_lock(t) proc_remove(pkt_dev->entry) proc_remove(pkt_dev->entry) pkt_dev->entry = proc_create_data(...) if_unlock(t) The kthread can pass the stale proc_dir_entry to proc_remove() after the rename path has freed it. A reproducer with a widened race window reports: BUG: KASAN: slab-use-after-free in proc_remove+0x78/0x80 Read of size 8 at addr ffff8881478fea70 by task kpktgend_0/67 Call Trace: proc_remove+0x78/0x80 pktgen_remove_device.isra.0+0x11c/0x4c0 pktgen_thread_worker+0x1214/0x6bc0 kthread+0x2c6/0x3b0 Allocated by task 95: __proc_create+0x204/0x790 proc_create_data+0x72/0xe0 pktgen_thread_write+0xd61/0x1510 Freed by task 28: kmem_cache_free+0xcb/0x3d0 proc_free_inode+0x5b/0x80 rcu_core+0x50a/0x1850 The buggy address belongs to the object at ffff8881478fea00 which belongs to the cache proc_dir_entry of size 192 Move proc_remove() into the if_lock-protected list removal helper. Keep it before list_del_rcu() to preserve the ordering required by add_device(). The rename path must then finish replacing the entry before removal, or it observes that the device is no longer on the list.","publishedAt":"2026-08-15T13:17:52","lastModifiedAt":"2026-08-23T13:16:44","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74479","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00126,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74479","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74479","en":"https://www.redsauce.net/en/cves/CVE-2026-74479","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74479","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74479","de":"https://www.redsauce.net/de/cves/CVE-2026-74479","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74479","el":"https://www.redsauce.net/el/cves/CVE-2026-74479"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74479"}}