{ "schema_version": "1.6.1", "id": "RPI-CVE-2026-46164", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2026-46164" ], "published": "2026-05-28T09:36:53Z", "summary": "btrfs: fix double free in create_space_info_sub_group() error path", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix double free in create_space_info_sub_group() error path\n\nWhen kobject_init_and_add() fails, the call chain is:\n\ncreate_space_info_sub_group()\n-> btrfs_sysfs_add_space_info_type()\n-> kobject_init_and_add()\n-> failure\n-> kobject_put(&sub_group->kobj)\n-> space_info_release()\n-> kfree(sub_group)\n\nThen control returns to create_space_info_sub_group(), where:\n\nbtrfs_sysfs_add_space_info_type() returns error\n-> kfree(sub_group)\n\nThus, sub_group is freed twice.\n\nKeep parent->sub_group[index] = NULL for the failure path, but after\nbtrfs_sysfs_add_space_info_type() has called kobject_put(), let the\nkobject release callback handle the cleanup.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.12.75-1+rpt1~bookworm", "1:6.12.87-1+rpt1~bookworm" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.12.75+rpt-rpi-2712", "binary_version": "1:6.12.75-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v6", "binary_version": "1:6.12.75-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v7", "binary_version": "1:6.12.75-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v7l", "binary_version": "1:6.12.75-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v8", "binary_version": "1:6.12.75-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v8-rt", "binary_version": "1:6.12.75-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-2712", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v6", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v7", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v7l", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v8", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v8-rt", "binary_version": "1:6.12.87-1+rpt1~bookworm" } ] }, "database_specific": { "per_version": { "1:6.12.75-1+rpt1~bookworm": { "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d", "upstream_version": "6.12.75", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.90" }, "1:6.12.87-1+rpt1~bookworm": { "linux_commit": "ae4d75fb36deba0fe1a986d9bfae65755e082dd0", "upstream_version": "6.12.87", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.90" } } } }, { "package": { "ecosystem": "Raspberry Pi OS:13", "name": "linux" }, "versions": [ "1:6.12.75-1+rpt1", "1:6.18.29-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.12.75+rpt-rpi-2712", "binary_version": "1:6.12.75-1+rpt1" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v6", "binary_version": "1:6.12.75-1+rpt1" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v7", "binary_version": "1:6.12.75-1+rpt1" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v8", "binary_version": "1:6.12.75-1+rpt1" }, { "binary_name": "linux-image-6.12.75+rpt-rpi-v8-rt", "binary_version": "1:6.12.75-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-2712", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-v6", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-v7", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-v8", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-v8-rt", "binary_version": "1:6.18.29-1+rpt1" } ] }, "database_specific": { "per_version": { "1:6.12.75-1+rpt1": { "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d", "upstream_version": "6.12.75", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.90" }, "1:6.18.29-1+rpt1": { "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc", "upstream_version": "6.18.29", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.18.32" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2026-46164" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c2d59527cba6d59f0d77a75c1101ab4e69758bea" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d2a675f2e238ec96c8e91e2718c1f910c9c8fb21" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/14b22be1dd844383eb03af9b1ee3b6b25d32aeaf" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/dfd05a16b5c9d1d98b47905f37f2fccda52173d1" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/259af6857a1b4f1e9ef8b780353f9d11c26a22bd" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a7449edf96143f192606ec8647e3167e1ecbd728" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T13:16:28Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.0, "cvss_v3_severity": "High", "scenario": "AV:L - The vulnerable code is only reachable through `open_ctree()` during a btrfs mount; it is not exposed over any network protocol and requires local access to introduce and mount the filesystem.\nAC:H - The double-free only triggers when `kobject_init_and_add()` fails (effectively ENOMEM, which the attacker cannot reliably induce at that exact allocation), and additionally requires a rare zoned btrfs configuration \u2014 conditions beyond the attacker's control.\nPR:N - Following the kernel CNA crafted-image mount-bug model, the attacker needs no privileges to supply the malicious zoned btrfs image; the privileged mount operation is captured under User Interaction.\nUI:R - A victim must perform the mount of the attacker-supplied zoned btrfs filesystem for the vulnerable path to execute.\nS:U - The corruption stays within the kernel's own memory/security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - A double-free corrupts the SLUB freelist and can be leveraged into a use-after-free granting attacker-controlled reads of freed/adjacent slab objects, enabling kernel memory disclosure.\nI:H - Freelist corruption from the double-free can be groomed into an arbitrary-write primitive, allowing modification of kernel data structures and control-flow hijacking.\nA:H - The double-free reliably corrupts slab state and (with freelist hardening) trips a BUG/panic, crashing the kernel." } } }