CVE-2026-99285— netfilter: nft_byteorder: remove multi-register support

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.

在 Linux 内核中，以下漏洞已得到修复： netfilter: nft_byteorder：移除多寄存器支持当需要对多个寄存器进行 64 位字节序转换时，转换功能会出现错误。原因是源寄存器数组的步进以 4 字节为单位递增，而非 8 字节：因此，决定移除多寄存器支持功能，该功能还存在其他问题： Pablo 指出，提交（"netfilter: nf_tables: 防止 nft_byteorder_eval 中的越界访问"）改变了原有语义：在补丁之前，循环操作的是寄存器，即：但在补丁之后，循环操作的是字节，

AI Predicted 3.7 Difficulty: Theoretical EPSS 0.17% · P6 Updated Nov 11, 2026

Possible ATT&CK Techniques 3 AI

T1069 · Permission Groups Discovery T1070 · Indicator Removal T1210 · Exploitation of Remote Services

Affected Version Matrix 22

Vendor	Product	Version Range	Status
Linux	Linux	`c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63< 3c5fb3a6c8118d15e60295e76fb5b879021eef43`	affected
		`c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63< dc29c0478b8564feb9371e715b5a0016eb8903fd`	affected
		`c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63< bb061d3de41707415269be75ebf700efb03ec212`	affected
		`fca41e5b687e029f69e3a35a2fa31e2560e538dc`	affected
		`25b42be4e067e107a2559266b54bf07fa5b094fb`	affected
		`9a865a11d6890d4a789db1eaafebdc8bd092b12c`	affected
		`b8b514b2a6cdfac24911e4910461bcb9db15ca8d`	affected
		`18a169810cff769a7a697b35058c756805f589e0`	affected
… +14 more rows

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Vulnerability Information

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Vulnerability Title

netfilter: nft_byteorder: remove multi-register support

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_byteorder: remove multi-register support 64bit byteorder conversion is broken when several registers need to be converted because the source register array advances in steps for 4 bytes instead of 8: for (i = ... src64 = nft_reg_load64(&src[i]); ~~~~~ u32 *src nft_reg_store64(&dst64[i], Remove the multi-register support, it has other issues as well: Pablo points out that commit caf3ef7468f7 ("netfilter: nf_tables: prevent OOB access in nft_byteorder_eval") alters semantics: before the loop operated on registers, i.e. for ( ... ) dst32[i] = htons((u16)src32[i]) .. but after the patch it will operate on bytes, which makes this useless to convert e.g. concatenations, which store each compound in its own register. Multi-convert of u32 has one theoretical application: ct mark . meta mark . tcp dport @intervalset Because ct mark and meta mark are host byte order, use with intervals has to convert the byteorder for ct/meta mark value to network byte order (bigendian). nftables emits this: [ meta load mark => reg 1 ] [ byteorder reg 1 = hton(reg 1, 4, 4) ] [ ct load mark => reg 9 ] [ byteorder reg 9 = hton(reg 9, 4, 4) ] ... I.e. two separate calls. Theoretically it could be changed to do: [ meta load mark => reg 1 ] [ ct load mark => reg 9 ] [ byteorder reg 1 = htonl(reg 1, 4, 8) ] ... But then all it would take to change the set to meta mark . tcp dport . ct mark ... and we'd be back to two "byteorder" calls. IOW, support to convert a range of registers is both dysfunctional and dubious. Simplify this: remove the feature. Pablo Neira Ayuso points out that nftables before 1.1.0 can generate incorrect byteorder conversions, see 9fe58952c45a, "evaluate: skip byteorder conversion for selector smaller than 2 bytes" in nftables.git). Affected rulesets fail to load with this change and old userspace due to 'len != size' check.

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63 ~ 3c5fb3a6c8118d15e60295e76fb5b879021eef43	-
Linux	Linux	6.7	-

II. Public POCs for CVE-2026-99285

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III. Intelligence Information for CVE-2026-99285

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Patches & Fixes for CVE-2026-99285 (3)

https://www.cve.org/CVERecord?id=CVE-2026-99285

Same Patch Batch · Linux · 2026-11-10 · 4 CVEs total

CVE-2026-99286		xen-netback: Fix XenBus connection failure cleanup
CVE-2026-99287		xen-netback: Zero out sring pointers on unmap
CVE-2026-99288		inet: reject unhashed sockets during established lookups

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux