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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-31434

btrfs: fix leak of kobject name for sub-group space_info

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 64c7ddda83acfbaa0efb381a1928ce908c584607 to < 416484f21a9d1280cf6daa7ebc10c79b59c46e48affected
  • 0bd151ce4200ca847990e05cca29a76456982ca5 to < 94054ffd311a1f76b7093ba8ebf50bdb0d28337caffected
  • 190d5a7c4fe42b8c9aa46e3336389e7cb10395bb to < 1737ddeafbb1304f41ec2eede4f7366082e7c96aaffected
  • f92ee31e031c7819126d2febdda0c3e91f5d2eb9 to < 3c844d01f9874a43004c82970d8da94f9aba8949affected
  • f92ee31e031c7819126d2febdda0c3e91f5d2eb9 to < 3c645c6f7e5470debbb81666b230056de48f36dcaffected
  • f92ee31e031c7819126d2febdda0c3e91f5d2eb9 to < a4376d9a5d4c9610e69def3fc0b32c86a7ab7a41affected
  • 6.1.162 to < 6.1.168affected
  • 6.6.122 to < 6.6.131affected
  • 6.12.67 to < 6.12.80affected

Linux Linux

Default version status: affected

  • 6.16affected
  • 0 to < 6.16unaffected
  • 6.1.168 to ≤ 6.1.*unaffected
  • 6.6.131 to ≤ 6.6.*unaffected
  • 6.12.80 to ≤ 6.12.*unaffected
  • 6.18.21 to ≤ 6.18.*unaffected
  • 6.19.11 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References