{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-26961", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-26961" ], "published": "2024-05-01T05:22:01Z", "summary": "mac802154: fix llsec key resources release in mac802154_llsec_key_del", "details": "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 \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 [] __kmem_cache_alloc_node+0x1e2/0x2d0\n [] kmalloc_trace+0x25/0xc0\n [] mac802154_llsec_key_add+0xac9/0xcf0\n [] ieee802154_add_llsec_key+0x5a/0x80\n [] nl802154_add_llsec_key+0x426/0x5b0\n [] genl_family_rcv_msg_doit+0x1fe/0x2f0\n [] genl_rcv_msg+0x531/0x7d0\n [] netlink_rcv_skb+0x169/0x440\n [] genl_rcv+0x28/0x40\n [] netlink_unicast+0x53c/0x820\n [] netlink_sendmsg+0x93b/0xe60\n [] ____sys_sendmsg+0xac5/0xca0\n [] ___sys_sendmsg+0x11d/0x1c0\n [] __sys_sendmsg+0xfa/0x1d0\n [] do_syscall_64+0x45/0xf0\n [] 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).", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": "1:6.1.47-1+rpt2" }, { 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"per_version": { "1:6.1.21-1+rpt1": { "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed", "upstream_version": "6.1.21", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.84" }, "1:6.1.47-1+rpt2": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.84" }, "1:6.1.47-1+rpt4": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.84", "compiled_filter": false }, "1:6.1.54-1+rpt2": { "linux_commit": "2906f7abdc03d4a92b6b0e2e0c87ea2a9dffe8f7", "upstream_version": "6.1.54", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.84" }, "1:6.1.58-1+rpt2": { "linux_commit": "ccf1586ad0663fa91238ac56abf6340d6d740d18", "upstream_version": "6.1.58", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.84" }, "1:6.1.63-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.63", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.84" }, "1:6.1.73-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.73", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.84" }, "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.24" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-26961" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/068ab2759bc0b4daf0b964de61b2731449c86531" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d3d858650933d44ac12c1f31337e7110c2071821" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/dcd51ab42b7a0431575689c5f74b8b6efd45fc2f" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/20d3e1c8a1847497269f04d874b2a5818ec29e2d" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/640297c3e897bd7e1481466a6a5cb9560f1edb88" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/49c8951680d7b76fceaee89dcfbab1363fb24fd1" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/e8a1e58345cf40b7b272e08ac7b32328b2543e40" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.0, "cvss_v3_severity": "High", "scenario": "AV:L - The exploitable racing reader is driven from a local `AF_IEEE802154` datagram socket via `sendmsg()` into `mac802154_llsec_encrypt()`, and the key-deletion side is a local genetlink operation; no remote peer can reach both sides.\nAC:H - The unprivileged attacker controls only the reader side (an unbounded `sendmsg()` loop hitting `llsec_lookup_key()`); the freeing side is a `CAP_NET_ADMIN` key deletion (e.g. llsec key rotation) that the attacker cannot initiate, so the narrow window between `list_del_rcu()` and `kfree_sensitive()` depends on a condition outside their control.\nPR:L - Creating an `AF_IEEE802154` `SOCK_DGRAM` socket and transmitting requires no capability (only `SOCK_RAW` checks `CAP_NET_RAW`), so any unprivileged local user can occupy the RCU read side and take the use-after-free in their own context.\nUI:N - No victim action is required; the attacker simply keeps the transmit path spinning in `llsec_lookup_key()` until a key removal lands.\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free on `struct mac802154_llsec_key` lets an attacker reclaim the freed slab object and have the kernel treat attacker-controlled bytes as crypto transform state, yielding kernel memory disclosure primitives.\nI:H - The freed object is immediately written to (`kref_get` increments a refcount inside freed memory) and its `tfm[]`/`tfm0` pointers are dereferenced and called through by `llsec_do_encrypt()`/`llsec_do_decrypt()`, giving a heap-spray-to-control-flow-hijack path.\nA:H - The bug already produces a `refcount_warn_saturate()` splat and dereferences freed crypto transform pointers, reliably oopsing the kernel; the leaked `ieee802154_llsec_key_entry` allocations compound it." } } }