{"id":"CVE-2026-46129","state":"PUBLISHED","title":"btrfs: fix double free in create_space_info() error path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix double free in create_space_info() error path\n\nWhen kobject_init_and_add() fails, the call chain is:\n\ncreate_space_info()\n-> btrfs_sysfs_add_space_info_type()\n-> kobject_init_and_add()\n-> failure\n-> kobject_put(&space_info->kobj)\n-> space_info_release()\n-> kfree(space_info)\n\nThen control returns to create_space_info():\n\nbtrfs_sysfs_add_space_info_type() returns error\n-> goto out_free\n-> kfree(space_info)\n\nThis causes a double free.\n\nKeep the direct kfree(space_info) for the earlier failure path, but\nafter btrfs_sysfs_add_space_info_type() has called kobject_put(), let\nthe kobject release callback handle the cleanup.","publishedAt":"2026-05-28T09:35:44.271Z","updatedAt":"2026-08-05T12:29:55.996Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"20e8f2de3688082eeafeb93c8900485b7542457e","status":"affected","lessThan":"ae6d6e31ceb72b7697c28a528e4923c08e3c2ef5","versionType":"git"},{"version":"58208907c4044a764dbd8896026283905da6d9be","status":"affected","lessThan":"c2670ec4aa49ca226bce9776601e0da37502be07","versionType":"git"},{"version":"bb4fa4c0b54aae25e55faeda7f78d0c11b8cd618","status":"affected","lessThan":"f414b3abbba59ef379a2b3c31f2bdd9358ed5e53","versionType":"git"},{"version":"6cb008f1bb23e023dfe615cca5df14570dfc8da5","status":"affected","lessThan":"9a060970fd7b5e1c561e4ce73cb9949e4269a738","versionType":"git"},{"version":"a11224a016d6d1d46a4d9b6573244448a80d4d7f","status":"affected","lessThan":"dd6ade0fdd59218d71a981ae7c937a304e49209c","versionType":"git"},{"version":"a11224a016d6d1d46a4d9b6573244448a80d4d7f","status":"affected","lessThan":"3f487be81292702a59ea9dbc4088b3360a50e837","versionType":"git"},{"version":"6.1.162","status":"affected","lessThan":"6.1.175","versionType":"semver"},{"version":"6.6.122","status":"affected","lessThan":"6.6.140","versionType":"semver"},{"version":"6.12.67","status":"affected","lessThan":"6.12.88","versionType":"semver"},{"version":"6.18.7","status":"affected","lessThan":"6.18.30","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/space-info.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/space-info.c"]}],"references":["https://git.kernel.org/stable/c/ae6d6e31ceb72b7697c28a528e4923c08e3c2ef5","https://git.kernel.org/stable/c/c2670ec4aa49ca226bce9776601e0da37502be07","https://git.kernel.org/stable/c/f414b3abbba59ef379a2b3c31f2bdd9358ed5e53","https://git.kernel.org/stable/c/9a060970fd7b5e1c561e4ce73cb9949e4269a738","https://git.kernel.org/stable/c/dd6ade0fdd59218d71a981ae7c937a304e49209c","https://git.kernel.org/stable/c/3f487be81292702a59ea9dbc4088b3360a50e837"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46129.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46129","state":"PUBLISHED","datePublished":"2026-05-28T09:35:44.271Z","dateUpdated":"2026-08-05T12:29:55.996Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.099Z"},"containers":{"cna":{"title":"btrfs: fix double free in create_space_info() error path","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix double free in create_space_info() error path\n\nWhen kobject_init_and_add() fails, the call chain is:\n\ncreate_space_info()\n-> btrfs_sysfs_add_space_info_type()\n-> kobject_init_and_add()\n-> failure\n-> kobject_put(&space_info->kobj)\n-> space_info_release()\n-> kfree(space_info)\n\nThen control returns to create_space_info():\n\nbtrfs_sysfs_add_space_info_type() returns error\n-> goto out_free\n-> kfree(space_info)\n\nThis causes a double free.\n\nKeep the direct kfree(space_info) for the earlier failure path, but\nafter btrfs_sysfs_add_space_info_type() has called kobject_put(), let\nthe kobject release callback handle the cleanup."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"20e8f2de3688082eeafeb93c8900485b7542457e","status":"affected","lessThan":"ae6d6e31ceb72b7697c28a528e4923c08e3c2ef5","versionType":"git"},{"version":"58208907c4044a764dbd8896026283905da6d9be","status":"affected","lessThan":"c2670ec4aa49ca226bce9776601e0da37502be07","versionType":"git"},{"version":"bb4fa4c0b54aae25e55faeda7f78d0c11b8cd618","status":"affected","lessThan":"f414b3abbba59ef379a2b3c31f2bdd9358ed5e53","versionType":"git"},{"version":"6cb008f1bb23e023dfe615cca5df14570dfc8da5","status":"affected","lessThan":"9a060970fd7b5e1c561e4ce73cb9949e4269a738","versionType":"git"},{"version":"a11224a016d6d1d46a4d9b6573244448a80d4d7f","status":"affected","lessThan":"dd6ade0fdd59218d71a981ae7c937a304e49209c","versionType":"git"},{"version":"a11224a016d6d1d46a4d9b6573244448a80d4d7f","status":"affected","lessThan":"3f487be81292702a59ea9dbc4088b3360a50e837","versionType":"git"},{"version":"6.1.162","status":"affected","lessThan":"6.1.175","versionType":"semver"},{"version":"6.6.122","status":"affected","lessThan":"6.6.140","versionType":"semver"},{"version":"6.12.67","status":"affected","lessThan":"6.12.88","versionType":"semver"},{"version":"6.18.7","status":"affected","lessThan":"6.18.30","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/space-info.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/space-info.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ae6d6e31ceb72b7697c28a528e4923c08e3c2ef5"},{"url":"https://git.kernel.org/stable/c/c2670ec4aa49ca226bce9776601e0da37502be07"},{"url":"https://git.kernel.org/stable/c/f414b3abbba59ef379a2b3c31f2bdd9358ed5e53"},{"url":"https://git.kernel.org/stable/c/9a060970fd7b5e1c561e4ce73cb9949e4269a738"},{"url":"https://git.kernel.org/stable/c/dd6ade0fdd59218d71a981ae7c937a304e49209c"},{"url":"https://git.kernel.org/stable/c/3f487be81292702a59ea9dbc4088b3360a50e837"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable code is reachable only during a btrfs mount (btrfs_fill_super → open_ctree → btrfs_init_space_info → create_space_info); it requires presenting a device/image and initiating a mount locally, with no network path.\nAC:L - The failure point is kobject_init_and_add() returning an allocation error; per guidance memory pressure is attacker-influenceable, and an attacker can repeatedly retry mounts under induced pressure to hit it.\nPR:L - On typical desktops/kiosks an unprivileged user can mount attacker-supplied removable media or loop images via udisks2/autofs, so no real root in the init namespace is strictly required to initiate the triggering mount.\nUI:N - The attacker performs the mount of their own crafted image themselves, so no separate victim action is required.\nS:U - The double free corrupts kernel heap state within the kernel's own security authority with no crossing into another security domain (no VM/IOMMU boundary).\nC:H - A double free is memory corruption that can be leveraged via reallocation of the freed slot into an attacker-controlled object, enabling kernel memory disclosure.\nI:H - Double-free corruption of the heap allocator can be groomed into a write primitive / control-flow hijack, so integrity impact is High.\nA:H - A double free reliably corrupts allocator metadata and causes kernel oops/panic, yielding a High availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:29:55.996Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.162","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.122","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.67","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.7","versionEndExcluding":"6.18.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}