{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "64c7ddda83acfbaa0efb381a1928ce908c584607"
            },
            {
              "fixed": "416484f21a9d1280cf6daa7ebc10c79b59c46e48"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0bd151ce4200ca847990e05cca29a76456982ca5"
            },
            {
              "fixed": "94054ffd311a1f76b7093ba8ebf50bdb0d28337c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "190d5a7c4fe42b8c9aa46e3336389e7cb10395bb"
            },
            {
              "fixed": "1737ddeafbb1304f41ec2eede4f7366082e7c96a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9"
            },
            {
              "fixed": "3c844d01f9874a43004c82970d8da94f9aba8949"
            },
            {
              "fixed": "3c645c6f7e5470debbb81666b230056de48f36dc"
            },
            {
              "fixed": "a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.1.162"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.122"
            },
            {
              "fixed": "6.6.131"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.67"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.131"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31434.json"
  },
  "details": "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-\u003esub_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-\u003ename 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.",
  "id": "CVE-2026-31434",
  "modified": "2026-07-15T01:49:15.571619723Z",
  "published": "2026-04-22T13:53:34.357Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1737ddeafbb1304f41ec2eede4f7366082e7c96a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c645c6f7e5470debbb81666b230056de48f36dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c844d01f9874a43004c82970d8da94f9aba8949"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/416484f21a9d1280cf6daa7ebc10c79b59c46e48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94054ffd311a1f76b7093ba8ebf50bdb0d28337c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31434.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31434"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "btrfs: fix leak of kobject name for sub-group space_info"
}