CVE-2026-31434 (GCVE-0-2026-31434)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:53 – Updated: 2026-04-22 13:53
VLAI?
Title
btrfs: fix leak of kobject name for sub-group space_info
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix leak of kobject name for sub-group space_info When create_space_info_sub_group() allocates elements of space_info->sub_group[], kobject_init_and_add() is called for each element via btrfs_sysfs_add_space_info_type(). However, when check_removing_space_info() frees these elements, it does not call btrfs_sysfs_remove_space_info() on them. As a result, kobject_put() is not called and the associated kobj->name objects are leaked. This memory leak is reproduced by running the blktests test case zbd/009 on kernels built with CONFIG_DEBUG_KMEMLEAK. The kmemleak feature reports the following error: unreferenced object 0xffff888112877d40 (size 16): comm "mount", pid 1244, jiffies 4294996972 hex dump (first 16 bytes): 64 61 74 61 2d 72 65 6c 6f 63 00 c4 c6 a7 cb 7f data-reloc...... backtrace (crc 53ffde4d): __kmalloc_node_track_caller_noprof+0x619/0x870 kstrdup+0x42/0xc0 kobject_set_name_vargs+0x44/0x110 kobject_init_and_add+0xcf/0x150 btrfs_sysfs_add_space_info_type+0xfc/0x210 [btrfs] create_space_info_sub_group.constprop.0+0xfb/0x1b0 [btrfs] create_space_info+0x211/0x320 [btrfs] btrfs_init_space_info+0x15a/0x1b0 [btrfs] open_ctree+0x33c7/0x4a50 [btrfs] btrfs_get_tree.cold+0x9f/0x1ee [btrfs] vfs_get_tree+0x87/0x2f0 vfs_cmd_create+0xbd/0x280 __do_sys_fsconfig+0x3df/0x990 do_syscall_64+0x136/0x1540 entry_SYSCALL_64_after_hwframe+0x76/0x7e To avoid the leak, call btrfs_sysfs_remove_space_info() instead of kfree() for the elements.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 64c7ddda83acfbaa0efb381a1928ce908c584607 , < 416484f21a9d1280cf6daa7ebc10c79b59c46e48 (git)
Affected: 0bd151ce4200ca847990e05cca29a76456982ca5 , < 94054ffd311a1f76b7093ba8ebf50bdb0d28337c (git)
Affected: 190d5a7c4fe42b8c9aa46e3336389e7cb10395bb , < 1737ddeafbb1304f41ec2eede4f7366082e7c96a (git)
Affected: f92ee31e031c7819126d2febdda0c3e91f5d2eb9 , < 3c844d01f9874a43004c82970d8da94f9aba8949 (git)
Affected: f92ee31e031c7819126d2febdda0c3e91f5d2eb9 , < 3c645c6f7e5470debbb81666b230056de48f36dc (git)
Affected: f92ee31e031c7819126d2febdda0c3e91f5d2eb9 , < a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41 (git)
Create a notification for this product.
    Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/block-group.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "416484f21a9d1280cf6daa7ebc10c79b59c46e48",
              "status": "affected",
              "version": "64c7ddda83acfbaa0efb381a1928ce908c584607",
              "versionType": "git"
            },
            {
              "lessThan": "94054ffd311a1f76b7093ba8ebf50bdb0d28337c",
              "status": "affected",
              "version": "0bd151ce4200ca847990e05cca29a76456982ca5",
              "versionType": "git"
            },
            {
              "lessThan": "1737ddeafbb1304f41ec2eede4f7366082e7c96a",
              "status": "affected",
              "version": "190d5a7c4fe42b8c9aa46e3336389e7cb10395bb",
              "versionType": "git"
            },
            {
              "lessThan": "3c844d01f9874a43004c82970d8da94f9aba8949",
              "status": "affected",
              "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9",
              "versionType": "git"
            },
            {
              "lessThan": "3c645c6f7e5470debbb81666b230056de48f36dc",
              "status": "affected",
              "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9",
              "versionType": "git"
            },
            {
              "lessThan": "a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41",
              "status": "affected",
              "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/block-group.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.131",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "6.1.162",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.131",
                  "versionStartIncluding": "6.6.122",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.80",
                  "versionStartIncluding": "6.12.67",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.21",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-22T13:53:34.357Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31434",
    "datePublished": "2026-04-22T13:53:34.357Z",
    "dateReserved": "2026-03-09T15:48:24.089Z",
    "dateUpdated": "2026-04-22T13:53:34.357Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31434\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-22T14:16:36.533\",\"lastModified\":\"2026-04-22T14:16:36.533\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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-\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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1737ddeafbb1304f41ec2eede4f7366082e7c96a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c645c6f7e5470debbb81666b230056de48f36dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c844d01f9874a43004c82970d8da94f9aba8949\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/416484f21a9d1280cf6daa7ebc10c79b59c46e48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/94054ffd311a1f76b7093ba8ebf50bdb0d28337c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.