{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-50055", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-50055" ], "published": "2024-10-21T19:40:44Z", "summary": "driver core: bus: Fix double free in driver API bus_register()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: bus: Fix double free in driver API bus_register()\n\nFor bus_register(), any error which happens after kset_register() will\ncause that @priv are freed twice, fixed by setting @priv with NULL after\nthe first free.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.6.20+rpt-rpi-2712", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.20+rpt-rpi-v6", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.20+rpt-rpi-v7", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.20+rpt-rpi-v7l", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.20+rpt-rpi-v8", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-2712", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-v6", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-v7", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-v7l", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-v8", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-2712", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-v6", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-v7", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-v7l", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-v8", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": "linux-image-6.6.47+rpt-rpi-2712", "binary_version": "1:6.6.47-1+rpt1" }, { "binary_name": "linux-image-6.6.47+rpt-rpi-v6", "binary_version": "1:6.6.47-1+rpt1" }, { "binary_name": "linux-image-6.6.47+rpt-rpi-v7", "binary_version": "1:6.6.47-1+rpt1" }, { "binary_name": "linux-image-6.6.47+rpt-rpi-v7l", "binary_version": "1:6.6.47-1+rpt1" }, { "binary_name": "linux-image-6.6.47+rpt-rpi-v8", "binary_version": "1:6.6.47-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-2712", "binary_version": "1:6.6.51-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v6", "binary_version": "1:6.6.51-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v7", "binary_version": "1:6.6.51-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v7l", "binary_version": "1:6.6.51-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v8", "binary_version": "1:6.6.51-1+rpt1" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-2712", "binary_version": "1:6.6.51-1+rpt2" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v6", "binary_version": "1:6.6.51-1+rpt2" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v7", "binary_version": "1:6.6.51-1+rpt2" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v7l", "binary_version": "1:6.6.51-1+rpt2" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v8", "binary_version": "1:6.6.51-1+rpt2" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-2712", "binary_version": "1:6.6.51-1+rpt3" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v6", "binary_version": "1:6.6.51-1+rpt3" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v7", "binary_version": "1:6.6.51-1+rpt3" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v7l", "binary_version": "1:6.6.51-1+rpt3" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v8", "binary_version": "1:6.6.51-1+rpt3" } ] }, "database_specific": { "per_version": { "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.57" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.57" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.57" }, "1:6.6.47-1+rpt1": { "linux_commit": "cf64a1dfecc2dc418efdd61701c1a4b185ab4761", "upstream_version": "6.6.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.57" }, "1:6.6.51-1+rpt1": { "linux_commit": "0094eba3f2a4338cfa6854b0b5104d02ba0fa01f", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.57" }, "1:6.6.51-1+rpt2": { "linux_commit": "82a50e430ef1d6eb37d78e25aa572c1f6ea56160", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.57" }, "1:6.6.51-1+rpt3": { "linux_commit": "5aeecea9f4a45248bcf564dec924965e066a7bfd", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.57" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-50055" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d885c464c25018b81a6b58f5d548fc2e3ef87dd1" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/9ce15f68abedfae7ae0a35e95895aeddfd0f0c6a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/bfa54a793ba77ef696755b66f3ac4ed00c7d1248" } ], "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": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - `bus_register()` is a driver-core API invoked only from subsystem initialization running on the local machine; the unprivileged trigger is a local `socket(AF_NETLINK, SOCK_RAW, NETLINK_ISCSI)` syscall that forces module autoload. No remote peer, network packet, or physical device is involved.\nAC:L - The attacker can drive the system into memory pressure and then repeatedly force `scsi_transport_iscsi` autoload, because a failed module init leaves the netlink protocol unregistered so the request_module can be replayed without limit until an allocation inside `bus_register()` fails. Nothing about the trigger depends on state outside the attacker's influence, and the two `kfree()` calls then execute back-to-back deterministically.\nPR:L - `netlink_create()` performs `request_module(\"net-pf-16-proto-8\")` with no capability check at all, so an ordinary unprivileged user reaches `iscsi_transport_init()` \u2192 `bus_register(&iscsi_flashnode_bus)` with a single socket() call. No CAP_SYS_MODULE, no root, and no user-namespace trickery is needed for this path.\nUI:N - The attacker performs every step itself \u2014 create memory pressure, issue the socket() call that triggers autoload \u2014 with no victim action, mount, file open, or administrator involvement required.\nS:U - The corrupted object is a kernel slab allocation and the consequences stay entirely within the kernel's own security authority; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The double free makes the SLUB freelist self-referential so two later allocations of the same size class alias one address, giving type confusion between attacker-controlled and kernel objects and thus an arbitrary kernel-memory read primitive. Freed-object contents can be reclaimed and disclosed through the aliased structure.\nI:H - The same freelist aliasing lets an attacker-sprayed object overwrite the fields of an unrelated live kernel structure \u2014 including function pointers reachable from `struct subsys_private`-sized kmalloc objects \u2014 yielding an arbitrary write and control-flow hijack primitive, i.e. full local privilege escalation.\nA:H - Even without successful exploitation the double free corrupts the slab allocator and panics the machine; on kernels built with CONFIG_SLAB_FREELIST_HARDENED the `BUG_ON(object == fp)` in `set_freepointer()` fires immediately, and `bus_release()` additionally calls `lockdep_unregister_key()` on a never-registered key on the early error paths." } } }