CVE-2023-53843— net: openvswitch: reject negative ifindex
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I. Basic Information for CVE-2023-53843
Vulnerability Information
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Vulnerability Title
net: openvswitch: reject negative ifindex
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: reject negative ifindex Recent changes in net-next (commit 759ab1edb56c ("net: store netdevs in an xarray")) refactored the handling of pre-assigned ifindexes and let syzbot surface a latent problem in ovs. ovs does not validate ifindex, making it possible to create netdev ports with negative ifindex values. It's easy to repro with YNL: $ ./cli.py --spec netlink/specs/ovs_datapath.yaml \ --do new \ --json '{"upcall-pid": 1, "name":"my-dp"}' $ ./cli.py --spec netlink/specs/ovs_vport.yaml \ --do new \ --json '{"upcall-pid": "00000001", "name": "some-port0", "dp-ifindex":3,"ifindex":4294901760,"type":2}' $ ip link show -65536: some-port0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 7a:48:21:ad:0b:fb brd ff:ff:ff:ff:ff:ff ... Validate the inputs. Now the second command correctly returns: $ ./cli.py --spec netlink/specs/ovs_vport.yaml \ --do new \ --json '{"upcall-pid": "00000001", "name": "some-port0", "dp-ifindex":3,"ifindex":4294901760,"type":2}' lib.ynl.NlError: Netlink error: Numerical result out of range nl_len = 108 (92) nl_flags = 0x300 nl_type = 2 error: -34 extack: {'msg': 'integer out of range', 'unknown': [[type:4 len:36] b'\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x03\x00\xff\xff\xff\x7f\x00\x00\x00\x00\x08\x00\x01\x00\x08\x00\x00\x00'], 'bad-attr': '.ifindex'} Accept 0 since it used to be silently ignored.
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openvswitch未验证负值ifindex，可能导致创建无效网络设备端口。
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-2023-53843
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Same Patch Batch · Linux · 2025-12-09 · 152 CVEs total
| CVE-2023-53826 | ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show() | |
| CVE-2023-53846 | f2fs: fix to do sanity check on direct node in truncate_dnode() | |
| CVE-2023-53845 | nilfs2: fix infinite loop in nilfs_mdt_get_block() | |
| CVE-2023-53844 | drm/ttm: Don't leak a resource on swapout move error | |
| CVE-2023-53842 | ASoC: codecs: wcd-mbhc-v2: fix resource leaks on component remove | |
| CVE-2023-53841 | devlink: report devlink_port_type_warn source device | |
| CVE-2023-53840 | usb: early: xhci-dbc: Fix a potential out-of-bound memory access | |
| CVE-2023-53839 | dccp: fix data-race around dp->dccps_mss_cache | |
| CVE-2023-53838 | f2fs: synchronize atomic write aborts | |
| CVE-2023-53837 | drm/msm: fix NULL-deref on snapshot tear down | |
| CVE-2023-53836 | bpf, sockmap: Fix skb refcnt race after locking changes | |
| CVE-2023-53834 | iio: adc: ina2xx: avoid NULL pointer dereference on OF device match | |
| CVE-2023-53833 | drm/i915: Fix NULL ptr deref by checking new_crtc_state | |
| CVE-2023-53832 | md/raid10: fix null-ptr-deref in raid10_sync_request | |
| CVE-2023-53831 | net: read sk->sk_family once in sk_mc_loop() | |
| CVE-2023-53830 | platform/x86: think-lmi: Fix memory leak when showing current settings | |
| CVE-2023-53829 | f2fs: flush inode if atomic file is aborted | |
| CVE-2023-53828 | Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor() | |
| CVE-2023-53827 | Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp} | |
| CVE-2022-50674 | riscv: vdso: fix NULL deference in vdso_join_timens() when vfork |
Showing top 20 of 152 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-2023-53843
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