{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46164", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.102Z", "datePublished": "2026-05-28T09:36:19.810Z", "dateUpdated": "2026-08-05T12:30:08.949Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:08.949Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "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 — 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/btrfs/space-info.c" ], "versions": [ { "version": "64c7ddda83acfbaa0efb381a1928ce908c584607", "lessThan": "c2d59527cba6d59f0d77a75c1101ab4e69758bea", "status": "affected", "versionType": "git" }, { "version": "0bd151ce4200ca847990e05cca29a76456982ca5", "lessThan": "d2a675f2e238ec96c8e91e2718c1f910c9c8fb21", "status": "affected", "versionType": "git" }, { "version": "190d5a7c4fe42b8c9aa46e3336389e7cb10395bb", "lessThan": "14b22be1dd844383eb03af9b1ee3b6b25d32aeaf", "status": "affected", "versionType": "git" }, { "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "dfd05a16b5c9d1d98b47905f37f2fccda52173d1", "status": "affected", "versionType": "git" }, { "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "259af6857a1b4f1e9ef8b780353f9d11c26a22bd", "status": "affected", "versionType": "git" }, { "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "a7449edf96143f192606ec8647e3167e1ecbd728", "status": "affected", "versionType": "git" }, { "version": "6.1.162", "lessThan": "6.1.176", "status": "affected", "versionType": "semver" }, { "version": "6.6.122", "lessThan": "6.6.141", "status": "affected", "versionType": "semver" }, { "version": "6.12.67", "lessThan": "6.12.90", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/btrfs/space-info.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.90", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.32", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.162", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.122", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.67", "versionEndExcluding": "6.12.90" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.32" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c2d59527cba6d59f0d77a75c1101ab4e69758bea" }, { "url": "https://git.kernel.org/stable/c/d2a675f2e238ec96c8e91e2718c1f910c9c8fb21" }, { "url": "https://git.kernel.org/stable/c/14b22be1dd844383eb03af9b1ee3b6b25d32aeaf" }, { "url": "https://git.kernel.org/stable/c/dfd05a16b5c9d1d98b47905f37f2fccda52173d1" }, { "url": "https://git.kernel.org/stable/c/259af6857a1b4f1e9ef8b780353f9d11c26a22bd" }, { "url": "https://git.kernel.org/stable/c/a7449edf96143f192606ec8647e3167e1ecbd728" } ], "title": "btrfs: fix double free in create_space_info_sub_group() error path", "x_generator": { "engine": "bippy-1.2.0" } } } }