CVE-2021-46956— virtiofs: fix memory leak in virtio_fs_probe()
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I. Basic Information for CVE-2021-46956
Vulnerability Information
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Vulnerability Title
virtiofs: fix memory leak in virtio_fs_probe()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: virtiofs: fix memory leak in virtio_fs_probe() When accidentally passing twice the same tag to qemu, kmemleak ended up reporting a memory leak in virtiofs. Also, looking at the log I saw the following error (that's when I realised the duplicated tag): virtiofs: probe of virtio5 failed with error -17 Here's the kmemleak log for reference: unreferenced object 0xffff888103d47800 (size 1024): comm "systemd-udevd", pid 118, jiffies 4294893780 (age 18.340s) hex dump (first 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff ................ backtrace: [<000000000ebb87c1>] virtio_fs_probe+0x171/0x7ae [virtiofs] [<00000000f8aca419>] virtio_dev_probe+0x15f/0x210 [<000000004d6baf3c>] really_probe+0xea/0x430 [<00000000a6ceeac8>] device_driver_attach+0xa8/0xb0 [<00000000196f47a7>] __driver_attach+0x98/0x140 [<000000000b20601d>] bus_for_each_dev+0x7b/0xc0 [<00000000399c7b7f>] bus_add_driver+0x11b/0x1f0 [<0000000032b09ba7>] driver_register+0x8f/0xe0 [<00000000cdd55998>] 0xffffffffa002c013 [<000000000ea196a2>] do_one_initcall+0x64/0x2e0 [<0000000008f727ce>] do_init_module+0x5c/0x260 [<000000003cdedab6>] __do_sys_finit_module+0xb5/0x120 [<00000000ad2f48c6>] do_syscall_64+0x33/0x40 [<00000000809526b5>] entry_SYSCALL_64_after_hwframe+0x44/0xae
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 virtio_fs_probe() 中存在内存泄漏。
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-2021-46956
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Same Patch Batch · Linux · 2024-02-27 · 67 CVEs total
| CVE-2021-46950 | md/raid1: properly indicate failure when ending a failed write request | |
| CVE-2021-46971 | perf/core: Fix unconditional security_locked_down() call | |
| CVE-2021-46970 | bus: mhi: pci_generic: Remove WQ_MEM_RECLAIM flag from state workqueue | |
| CVE-2021-46969 | bus: mhi: core: Fix invalid error returning in mhi_queue | |
| CVE-2021-46957 | riscv/kprobe: fix kernel panic when invoking sys_read traced by kprobe | |
| CVE-2021-46955 | openvswitch: fix stack OOB read while fragmenting IPv4 packets | |
| CVE-2021-46954 | net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets | |
| CVE-2021-46953 | ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure | |
| CVE-2021-46952 | NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds | |
| CVE-2021-46951 | tpm: efi: Use local variable for calculating final log size | |
| CVE-2021-46958 | btrfs: fix race between transaction aborts and fsyncs leading to use-after-free | |
| CVE-2021-46949 | sfc: farch: fix TX queue lookup in TX flush done handling | |
| CVE-2021-46948 | sfc: farch: fix TX queue lookup in TX event handling | |
| CVE-2021-46947 | sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues | |
| CVE-2021-46945 | ext4: always panic when errors=panic is specified | |
| CVE-2021-46944 | media: staging/intel-ipu3: Fix memory leak in imu_fmt | |
| CVE-2021-46943 | media: staging/intel-ipu3: Fix set_fmt error handling | |
| CVE-2021-46942 | io_uring: fix shared sqpoll cancellation hangs | |
| CVE-2021-46941 | usb: dwc3: core: Do core softreset when switch mode | |
| CVE-2021-46940 | tools/power turbostat: Fix offset overflow issue in index converting |
Showing top 20 of 67 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
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