{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31434", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.089Z", "datePublished": "2026-04-22T13:53:34.357Z", "dateUpdated": "2026-05-23T16:05:03.539Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T16:05:03.539Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix leak of kobject name for sub-group space_info\n\nWhen create_space_info_sub_group() allocates elements of\nspace_info->sub_group[], kobject_init_and_add() is called for each\nelement via btrfs_sysfs_add_space_info_type(). However, when\ncheck_removing_space_info() frees these elements, it does not call\nbtrfs_sysfs_remove_space_info() on them. As a result, kobject_put() is\nnot called and the associated kobj->name objects are leaked.\n\nThis memory leak is reproduced by running the blktests test case\nzbd/009 on kernels built with CONFIG_DEBUG_KMEMLEAK. The kmemleak\nfeature reports the following error:\n\nunreferenced object 0xffff888112877d40 (size 16):\n comm \"mount\", pid 1244, jiffies 4294996972\n hex dump (first 16 bytes):\n 64 61 74 61 2d 72 65 6c 6f 63 00 c4 c6 a7 cb 7f data-reloc......\n backtrace (crc 53ffde4d):\n __kmalloc_node_track_caller_noprof+0x619/0x870\n kstrdup+0x42/0xc0\n kobject_set_name_vargs+0x44/0x110\n kobject_init_and_add+0xcf/0x150\n btrfs_sysfs_add_space_info_type+0xfc/0x210 [btrfs]\n create_space_info_sub_group.constprop.0+0xfb/0x1b0 [btrfs]\n create_space_info+0x211/0x320 [btrfs]\n btrfs_init_space_info+0x15a/0x1b0 [btrfs]\n open_ctree+0x33c7/0x4a50 [btrfs]\n btrfs_get_tree.cold+0x9f/0x1ee [btrfs]\n vfs_get_tree+0x87/0x2f0\n vfs_cmd_create+0xbd/0x280\n __do_sys_fsconfig+0x3df/0x990\n do_syscall_64+0x136/0x1540\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nTo avoid the leak, call btrfs_sysfs_remove_space_info() instead of\nkfree() for the elements." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/btrfs/block-group.c" ], "versions": [ { "version": "64c7ddda83acfbaa0efb381a1928ce908c584607", "lessThan": "416484f21a9d1280cf6daa7ebc10c79b59c46e48", "status": "affected", "versionType": "git" }, { "version": "0bd151ce4200ca847990e05cca29a76456982ca5", "lessThan": "94054ffd311a1f76b7093ba8ebf50bdb0d28337c", "status": "affected", "versionType": "git" }, { "version": "190d5a7c4fe42b8c9aa46e3336389e7cb10395bb", "lessThan": "1737ddeafbb1304f41ec2eede4f7366082e7c96a", "status": "affected", "versionType": "git" }, { "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "3c844d01f9874a43004c82970d8da94f9aba8949", "status": "affected", "versionType": "git" }, { "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "3c645c6f7e5470debbb81666b230056de48f36dc", "status": "affected", "versionType": "git" }, { "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41", "status": "affected", "versionType": "git" }, { "version": "6.1.162", "lessThan": "6.1.168", "status": "affected", "versionType": "semver" }, { "version": "6.6.122", "lessThan": "6.6.131", "status": "affected", "versionType": "semver" }, { "version": "6.12.67", "lessThan": "6.12.80", "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/block-group.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.122", "versionEndExcluding": "6.6.131" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.67", "versionEndExcluding": "6.12.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.19.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/416484f21a9d1280cf6daa7ebc10c79b59c46e48" }, { "url": "https://git.kernel.org/stable/c/94054ffd311a1f76b7093ba8ebf50bdb0d28337c" }, { "url": "https://git.kernel.org/stable/c/1737ddeafbb1304f41ec2eede4f7366082e7c96a" }, { "url": "https://git.kernel.org/stable/c/3c844d01f9874a43004c82970d8da94f9aba8949" }, { "url": "https://git.kernel.org/stable/c/3c645c6f7e5470debbb81666b230056de48f36dc" }, { "url": "https://git.kernel.org/stable/c/a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41" } ], "title": "btrfs: fix leak of kobject name for sub-group space_info", "x_generator": { "engine": "bippy-1.2.0" } } } }