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CVE-2023-54243— netfilter: ebtables: fix table blob use-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，该漏洞源于表blob释放后重用，可能导致越界访问。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1206

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux c58dd2dd443c26d856a168db108a0cd11c285bf3< 9060abce3305ab2354c892c09d5689df51486df5 affected
c58dd2dd443c26d856a168db108a0cd11c285bf3< dbb3cbbf03b3c52cb390fabec357f1e4638004f5 affected
c58dd2dd443c26d856a168db108a0cd11c285bf3< 3dd6ac973351308d4117eda32298a9f1d68764fd affected
c58dd2dd443c26d856a168db108a0cd11c285bf3< cda0e0243bd3c04008fcd37a46b0269fb3c49249 affected
c58dd2dd443c26d856a168db108a0cd11c285bf3< e58a171d35e32e6e8c37cfe0e8a94406732a331f affected
a3bc0f8ea439762aa62d40a295157410498cbea7 affected
8ed40c122919cd79bc3c059e5864e5e7d9d455f0 affected
c5e4ef499cfc78de45a4f01b8c557b5964d77c53 affected
… +14 more rows
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I. Basic Information for CVE-2023-54243

Vulnerability Information
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Vulnerability Title
netfilter: ebtables: fix table blob use-after-free
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: fix table blob use-after-free We are not allowed to return an error at this point. Looking at the code it looks like ret is always 0 at this point, but its not. t = find_table_lock(net, repl->name, &ret, &ebt_mutex); ... this can return a valid table, with ret != 0. This bug causes update of table->private with the new blob, but then frees the blob right away in the caller. Syzbot report: BUG: KASAN: vmalloc-out-of-bounds in __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168 Read of size 4 at addr ffffc90005425000 by task kworker/u4:4/74 Workqueue: netns cleanup_net Call Trace: kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168 ebt_unregister_table+0x35/0x40 net/bridge/netfilter/ebtables.c:1372 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613 ... ip(6)tables appears to be ok (ret should be 0 at this point) but make this more obvious.
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，该漏洞源于表blob释放后重用，可能导致越界访问。
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 c58dd2dd443c26d856a168db108a0cd11c285bf3 ~ 9060abce3305ab2354c892c09d5689df51486df5 -
Linux Linux 3.15 -

II. Public POCs for CVE-2023-54243

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III. Intelligence Information for CVE-2023-54243

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Other References for CVE-2023-54243 (5)

Same Patch Batch · Linux · 2025-12-30 · 244 CVEs total

CVE-2023-54184 9.8 CRITICAL scsi: target: iscsit: Free cmds before session free
CVE-2023-54223 9.8 CRITICAL net/mlx5e: xsk: Fix invalid buffer access for legacy rq
CVE-2023-54237 9.8 CRITICAL net/smc: fix potential panic dues to unprotected smc_llc_srv_add_link()
CVE-2023-54257 9.8 CRITICAL net: macb: fix a memory corruption in extended buffer descriptor mode
CVE-2023-54258 9.8 CRITICAL cifs: fix potential oops in cifs_oplock_break
CVE-2023-54269 9.8 CRITICAL SUNRPC: double free xprt_ctxt while still in use
CVE-2023-54280 9.8 CRITICAL cifs: fix potential race when tree connecting ipc
CVE-2023-54292 9.8 CRITICAL RDMA/irdma: Fix data race on CQP request done
CVE-2023-54203 9.1 CRITICAL ksmbd: fix slab-out-of-bounds in init_smb2_rsp_hdr
CVE-2023-54162 8.8 HIGH ksmbd: fix possible memory leak in smb2_lock()
CVE-2023-54318 8.8 HIGH net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add
CVE-2023-54262 8.8 HIGH net/mlx5e: Don't clone flow post action attributes second time
CVE-2023-54214 8.8 HIGH Bluetooth: L2CAP: Fix potential user-after-free
CVE-2022-50880 8.8 HIGH wifi: ath10k: add peer map clean up for peer delete in ath10k_sta_state()
CVE-2023-54250 8.2 HIGH ksmbd: avoid out of bounds access in decode_preauth_ctxt()
CVE-2023-54164 8.0 HIGH Bluetooth: ISO: fix iso_conn related locking and validity issues
CVE-2023-54210 7.8 HIGH Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()
CVE-2023-54201 7.8 HIGH RDMA/efa: Fix wrong resources deallocation order
CVE-2023-54206 7.8 HIGH net/sched: flower: fix filter idr initialization
CVE-2022-50860 7.8 HIGH apparmor: Fix memleak in alloc_ns()

Showing top 20 of 244 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-54243

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