CVE-2026-31434— btrfs: fix leak of kobject name for sub-group space_info
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I. Basic Information for CVE-2026-31434
Vulnerability Information
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Vulnerability Title
btrfs: fix leak of kobject name for sub-group space_info
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于btrfs子组space_info的kobject名称泄漏，可能导致内存泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-31434
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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total
| CVE-2026-31463 | 9.8 CRITICAL | iomap: fix invalid folio access when i_blkbits differs from I/O granularity |
| CVE-2026-31436 | 9.8 CRITICAL | dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc() |
| CVE-2026-31444 | 9.8 CRITICAL | ksmbd: fix use-after-free and NULL deref in smb_grant_oplock() |
| CVE-2026-31478 | 9.8 CRITICAL | ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len() |
| CVE-2026-31501 | 9.8 CRITICAL | net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path |
| CVE-2026-31448 | 9.4 CRITICAL | ext4: avoid infinite loops caused by residual data |
| CVE-2026-31432 | 8.8 HIGH | ksmbd: fix OOB write in QUERY_INFO for compound requests |
| CVE-2026-31433 | 8.8 HIGH | ksmbd: fix potencial OOB in get_file_all_info() for compound requests |
| CVE-2026-31435 | 8.8 HIGH | netfs: Fix read abandonment during retry |
| CVE-2026-31450 | 8.8 HIGH | ext4: publish jinode after initialization |
| CVE-2026-31476 | 8.2 HIGH | ksmbd: do not expire session on binding failure |
| CVE-2026-31464 | 8.1 HIGH | scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() |
| CVE-2026-31513 | 8.1 HIGH | Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req |
| CVE-2026-31490 | 7.8 HIGH | drm/xe/pf: Fix use-after-free in migration restore |
| CVE-2026-31453 | 7.8 HIGH | xfs: avoid dereferencing log items after push callbacks |
| CVE-2026-31494 | 7.8 HIGH | net: macb: use the current queue number for stats |
| CVE-2026-31502 | 7.8 HIGH | team: fix header_ops type confusion with non-Ethernet ports |
| CVE-2026-31449 | 7.8 HIGH | ext4: validate p_idx bounds in ext4_ext_correct_indexes |
| CVE-2026-31504 | 7.8 HIGH | net: fix fanout UAF in packet_release() via NETDEV_UP race |
| CVE-2026-31505 | 7.8 HIGH | iavf: fix out-of-bounds writes in iavf_get_ethtool_stats() |
Showing top 20 of 100 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-31434
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