CVE-2026-31434

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> btrfs: fix leak of kobject name for sub-group space_info<br /> <br /> When create_space_info_sub_group() allocates elements of<br /> space_info-&gt;sub_group[], kobject_init_and_add() is called for each<br /> element via btrfs_sysfs_add_space_info_type(). However, when<br /> check_removing_space_info() frees these elements, it does not call<br /> btrfs_sysfs_remove_space_info() on them. As a result, kobject_put() is<br /> not called and the associated kobj-&gt;name objects are leaked.<br /> <br /> This memory leak is reproduced by running the blktests test case<br /> zbd/009 on kernels built with CONFIG_DEBUG_KMEMLEAK. The kmemleak<br /> feature reports the following error:<br /> <br /> unreferenced object 0xffff888112877d40 (size 16):<br /> comm "mount", pid 1244, jiffies 4294996972<br /> hex dump (first 16 bytes):<br /> 64 61 74 61 2d 72 65 6c 6f 63 00 c4 c6 a7 cb 7f data-reloc......<br /> backtrace (crc 53ffde4d):<br /> __kmalloc_node_track_caller_noprof+0x619/0x870<br /> kstrdup+0x42/0xc0<br /> kobject_set_name_vargs+0x44/0x110<br /> kobject_init_and_add+0xcf/0x150<br /> btrfs_sysfs_add_space_info_type+0xfc/0x210 [btrfs]<br /> create_space_info_sub_group.constprop.0+0xfb/0x1b0 [btrfs]<br /> create_space_info+0x211/0x320 [btrfs]<br /> btrfs_init_space_info+0x15a/0x1b0 [btrfs]<br /> open_ctree+0x33c7/0x4a50 [btrfs]<br /> btrfs_get_tree.cold+0x9f/0x1ee [btrfs]<br /> vfs_get_tree+0x87/0x2f0<br /> vfs_cmd_create+0xbd/0x280<br /> __do_sys_fsconfig+0x3df/0x990<br /> do_syscall_64+0x136/0x1540<br /> entry_SYSCALL_64_after_hwframe+0x76/0x7e<br /> <br /> To avoid the leak, call btrfs_sysfs_remove_space_info() instead of<br /> kfree() for the elements.