CVE-2026-74479High· 7.8▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 39df232f1a9ba48d41c68ee7d4046756e709cf91 < 82ed3db9269cb61e3c15bad2f6e221efce90e1e0Linux >= 39df232f1a9ba48d41c68ee7d4046756e709cf91 < d1cc9797cf8f7aeb87e7ad01b748c6a960a819e4Linux >= 39df232f1a9ba48d41c68ee7d4046756e709cf91 < 7991c7cff8b8622cddb3d8dee07dbe74aa4cbec4Linux >= 39df232f1a9ba48d41c68ee7d4046756e709cf91 < 577443530cb592d5782a1f79847411a9363a65c8Linux >= 39df232f1a9ba48d41c68ee7d4046756e709cf91 < f85a58340b91f225de3299dfa782c6414098077cLinux >= 39df232f1a9ba48d41c68ee7d4046756e709cf91 < 4ef801b838d85c0ea5852c50667f7344ce3b6cd0Linux >= 39df232f1a9ba48d41c68ee7d4046756e709cf91 < b006a5404470bd3eb2aa0425fc447183032047efLinux >= 39df232f1a9ba48d41c68ee7d4046756e709cf91 < 817ff6efdb7f484ea547218e11e17d8e43daa3b4Linux 2.6.22Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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