{"cve":"CVE-2024-26961","nvd":{"published":"2024-05-01T06:15:12.437","modified":"2026-10-15T01:17:34.500","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: fix llsec key resources release in mac802154_llsec_key_del\n\nmac802154_llsec_key_del() can free resources of a key directly without\nfollowing the RCU rules for waiting before the end of a grace period. This\nmay lead to use-after-free in case llsec_lookup_key() is traversing the\nlist of keys in parallel with a key deletion:\n\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 4 PID: 16000 at lib/refcount.c:25 refcount_warn_saturate+0x162/0x2a0\nModules linked in:\nCPU: 4 PID: 16000 Comm: wpan-ping Not tainted 6.7.0 #19\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\nRIP: 0010:refcount_warn_saturate+0x162/0x2a0\nCall Trace:\n <TASK>\n llsec_lookup_key.isra.0+0x890/0x9e0\n mac802154_llsec_encrypt+0x30c/0x9c0\n ieee802154_subif_start_xmit+0x24/0x1e0\n dev_hard_start_xmit+0x13e/0x690\n sch_direct_xmit+0x2ae/0xbc0\n __dev_queue_xmit+0x11dd/0x3c20\n dgram_sendmsg+0x90b/0xd60\n __sys_sendto+0x466/0x4c0\n __x64_sys_sendto+0xe0/0x1c0\n do_syscall_64+0x45/0xf0\n entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\nAlso, ieee802154_llsec_key_entry structures are not freed by\nmac802154_llsec_key_del():\n\nunreferenced object 0xffff8880613b6980 (size 64):\n  comm \"iwpan\", pid 2176, jiffies 4294761134 (age 60.475s)\n  hex dump (first 32 bytes):\n    78 0d 8f 18 80 88 ff ff 22 01 00 00 00 00 ad de  x.......\".......\n    00 00 00 00 00 00 00 00 03 00 cd ab 00 00 00 00  ................\n  backtrace:\n    [<ffffffff81dcfa62>] __kmem_cache_alloc_node+0x1e2/0x2d0\n    [<ffffffff81c43865>] kmalloc_trace+0x25/0xc0\n    [<ffffffff88968b09>] mac802154_llsec_key_add+0xac9/0xcf0\n    [<ffffffff8896e41a>] ieee802154_add_llsec_key+0x5a/0x80\n    [<ffffffff8892adc6>] nl802154_add_llsec_key+0x426/0x5b0\n    [<ffffffff86ff293e>] genl_family_rcv_msg_doit+0x1fe/0x2f0\n    [<ffffffff86ff46d1>] genl_rcv_msg+0x531/0x7d0\n    [<ffffffff86fee7a9>] netlink_rcv_skb+0x169/0x440\n    [<ffffffff86ff1d88>] genl_rcv+0x28/0x40\n    [<ffffffff86fec15c>] netlink_unicast+0x53c/0x820\n    [<ffffffff86fecd8b>] netlink_sendmsg+0x93b/0xe60\n    [<ffffffff86b91b35>] ____sys_sendmsg+0xac5/0xca0\n    [<ffffffff86b9c3dd>] ___sys_sendmsg+0x11d/0x1c0\n    [<ffffffff86b9c65a>] __sys_sendmsg+0xfa/0x1d0\n    [<ffffffff88eadbf5>] do_syscall_64+0x45/0xf0\n    [<ffffffff890000ea>] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\nHandle the proper resource release in the RCU callback function\nmac802154_llsec_key_del_rcu().\n\nNote that if llsec_lookup_key() finds a key, it gets a refcount via\nllsec_key_get() and locally copies key id from key_entry (which is a\nlist element). So it's safe to call llsec_key_put() and free the list\nentry after the RCU grace period elapses.\n\nFound by Linux Verification Center (linuxtesting.org).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/068ab2759bc0b4daf0b964de61b2731449c86531","https://git.kernel.org/stable/c/20d3e1c8a1847497269f04d874b2a5818ec29e2d","https://git.kernel.org/stable/c/49c8951680d7b76fceaee89dcfbab1363fb24fd1","https://git.kernel.org/stable/c/640297c3e897bd7e1481466a6a5cb9560f1edb88","https://git.kernel.org/stable/c/d3d858650933d44ac12c1f31337e7110c2071821"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:49:08.435428910+00:00"},"epss":{"cve":"CVE-2024-26961","score":0.00242,"percentile":0.15219,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}