CVE-2026-23278— netfilter: nf_tables: always walk all pending catchall elements
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I. Basic Information for CVE-2026-23278
Vulnerability Information
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Vulnerability Title
netfilter: nf_tables: always walk all pending catchall elements
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: always walk all pending catchall elements During transaction processing we might have more than one catchall element: 1 live catchall element and 1 pending element that is coming as part of the new batch. If the map holding the catchall elements is also going away, its required to toggle all catchall elements and not just the first viable candidate. Otherwise, we get: WARNING: ./include/net/netfilter/nf_tables.h:1281 at nft_data_release+0xb7/0xe0 [nf_tables], CPU#2: nft/1404 RIP: 0010:nft_data_release+0xb7/0xe0 [nf_tables] [..] __nft_set_elem_destroy+0x106/0x380 [nf_tables] nf_tables_abort_release+0x348/0x8d0 [nf_tables] nf_tables_abort+0xcf2/0x3ac0 [nf_tables] nfnetlink_rcv_batch+0x9c9/0x20e0 [..]
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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nf_tables未遍历所有待处理的catchall元素，可能导致集合销毁时访问已释放数据。
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-2026-23278
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Same Patch Batch · Linux · 2026-03-20 · 8 CVEs total
| CVE-2026-23275 | 7.8 HIGH | io_uring: ensure ctx->rings is stable for task work flags manipulation |
| CVE-2026-23274 | 7.8 HIGH | netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels |
| CVE-2026-23273 | 7.8 HIGH | macvlan: observe an RCU grace period in macvlan_common_newlink() error path |
| CVE-2026-23272 | 7.8 HIGH | netfilter: nf_tables: unconditionally bump set->nelems before insertion |
| CVE-2026-23271 | 7.8 HIGH | perf: Fix __perf_event_overflow() vs perf_remove_from_context() race |
| CVE-2026-23276 | net: add xmit recursion limit to tunnel xmit functions | |
| CVE-2026-23277 | net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit |
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-2026-23278
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