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CVE-2023-53619— netfilter: conntrack: Avoid nf_ct_helper_hash uses after free

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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nf_ct_helper_hash释放后重用，可能导致随机内存损坏。

CVSS 7.8 · High EPSS 0.21% · P11

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 12f7a505331e6b2754684b509f2ac8f0011ce644< 4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7 affected
12f7a505331e6b2754684b509f2ac8f0011ce644< 00716f25f9697d02a0d9bd622575c7c7321ba3d0 affected
12f7a505331e6b2754684b509f2ac8f0011ce644< 61c7a5256543ae7d24cd9d21853d514c8632e1e9 affected
12f7a505331e6b2754684b509f2ac8f0011ce644< 8289d422f5e484efe4a565fe18e862ecd621c175 affected
12f7a505331e6b2754684b509f2ac8f0011ce644< 6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566 affected
12f7a505331e6b2754684b509f2ac8f0011ce644< 05561f822f27b9fa88fa5504ddec34bf38833034 affected
12f7a505331e6b2754684b509f2ac8f0011ce644< fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7 affected
12f7a505331e6b2754684b509f2ac8f0011ce644< 6eef7a2b933885a17679eb8ed0796ddf0ee5309b affected
… +10 more rows
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I. Basic Information for CVE-2023-53619

Vulnerability Information
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Vulnerability Title
netfilter: conntrack: Avoid nf_ct_helper_hash uses after free
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: Avoid nf_ct_helper_hash uses after free If nf_conntrack_init_start() fails (for example due to a register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini() clean-up path frees the nf_ct_helper_hash map. When built with NF_CONNTRACK=y, further netfilter modules (e.g: netfilter_conntrack_ftp) can still be loaded and call nf_conntrack_helpers_register(), independently of whether nf_conntrack initialized correctly. This accesses the nf_ct_helper_hash dangling pointer and causes a uaf, possibly leading to random memory corruption. This patch guards nf_conntrack_helper_register() from accessing a freed or uninitialized nf_ct_helper_hash pointer and fixes possible uses-after-free when loading a conntrack module.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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nf_ct_helper_hash释放后重用，可能导致随机内存损坏。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 12f7a505331e6b2754684b509f2ac8f0011ce644 ~ 4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7 -
Linux Linux 3.6 -

II. Public POCs for CVE-2023-53619

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III. Intelligence Information for CVE-2023-53619

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Same Patch Batch · Linux · 2025-10-07 · 118 CVEs total

CVE-2023-53629 9.8 CRITICAL fs: dlm: fix use after free in midcomms commit
CVE-2023-53630 8.8 HIGH iommufd: Fix unpinning of pages when an access is present
CVE-2023-53676 8.8 HIGH scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show()
CVE-2023-53675 8.8 HIGH scsi: ses: Fix possible desc_ptr out-of-bounds accesses
CVE-2023-53673 8.8 HIGH Bluetooth: hci_event: call disconnect callback before deleting conn
CVE-2023-53679 8.3 HIGH wifi: mt7601u: fix an integer underflow
CVE-2023-53635 8.2 HIGH netfilter: conntrack: fix wrong ct->timeout value
CVE-2022-50555 7.8 HIGH tipc: fix a null-ptr-deref in tipc_topsrv_accept
CVE-2023-53659 7.8 HIGH iavf: Fix out-of-bounds when setting channels on remove
CVE-2023-53660 7.8 HIGH bpf, cpumap: Handle skb as well when clean up ptr_ring
CVE-2023-53643 7.8 HIGH nvme-tcp: don't access released socket during error recovery
CVE-2023-53645 7.8 HIGH bpf: Make bpf_refcount_acquire fallible for non-owning refs
CVE-2023-53646 7.8 HIGH drm/i915/perf: add sentinel to xehp_oa_b_counters
CVE-2023-53669 7.8 HIGH tcp: fix skb_copy_ubufs() vs BIG TCP
CVE-2023-53626 7.8 HIGH ext4: fix possible double unlock when moving a directory
CVE-2023-53627 7.8 HIGH scsi: hisi_sas: Grab sas_dev lock when traversing the members of sas_dev.list
CVE-2022-50528 7.8 HIGH drm/amdkfd: Fix memory leakage
CVE-2022-50536 7.8 HIGH bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data
CVE-2022-50543 7.8 HIGH RDMA/rxe: Fix mr->map double free
CVE-2022-50517 7.8 HIGH mm/huge_memory: do not clobber swp_entry_t during THP split

Showing top 20 of 118 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53619

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