netfilter: nft_inner: Fix IPv6 inner_thoff desync
Priority MEDIUM 48CWE-682Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: Fix IPv6 inner_thoff desync In nft_inner_parse_l2l3(), when processing inner IPv6 packets, ipv6_find_hdr() correctly computes the transport header offset traversing all extension headers, but the result is immediately overwritten with nhoff + sizeof(_ip6h) (40 bytes), which only accounts for the IPv6 base header. This creates a desync between inner_thoff (wrong — points to extension header start) and l4proto (correct — e.g., IPPROTO_TCP), enabling transport header forgery and potential firewall bypass. This issue affects stable versions from Linux 6.2. For comparison, the normal (non-inner) IPv6 path correctly preserves ipv6_find_hdr()'s result. Removing the incorrect overwrite ensures that ipv6_find_hdr()'s calculated transport header offset is preserved, thereby fixing the desynchronization.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00418 36th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.6.142, 6.12.92, 6.18.34 +2Red Hat: 8 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 6.2 and later | 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1 | Patch available | CNA |
- Linux VendorLinux Affected 6.2 and later Fixed in 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.2 to before 6.6.142; 6.7 to before 6.12.92; 6.13 to before 6.18.34; 6.19 to before 7.0.11 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | 7.1 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | 7.1 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | 7.1 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | 7.1 rc4 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.2 to before 6.6.142; 6.7 to before 6.12.92; 6.13 to before 6.18.34; 6.19 to before 7.0.11 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* Versions 7.1 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* Versions 7.1 rc4 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1
Red Hat 8 advisories
- RHSA-2026:56225 Released 2026-08-18 · Red Hat rating Importantkpatch-patch-5_14_0-570_116_1, kpatch-patch-5_14_0-570_17_1, kpatch-patch-5_14_0-570_39_1, kpatch-patch-5_14_0-570_66_1, and kpatch-patch-5_14_0-570_94_1 security update
- Red Hat Enterprise Linux BaseOS EUS (v.9.6) kpatch-patch-5_14_0-570_116_1-1-7.el9_6, kpatch-patch-5_14_0-570_17_1-1-22.el9_6, kpatch-patch-5_14_0-570_39_1-1-13.el9_6 +2
- RHSA-2026:55763 Released 2026-08-17 · Red Hat rating Importantkpatch-patch-5_14_0-687_10_1 security update
- Red Hat Enterprise Linux BaseOS (v. 9) kpatch-patch-5_14_0-687_10_1-1-6.el9_8
- RHSA-2026:55618 Released 2026-08-17 · Red Hat rating Importantkpatch-patch-6_12_0-211_16_1 security update
- Red Hat Enterprise Linux BaseOS (v. 10) kpatch-patch-6_12_0-211_16_1-1-6.el10_2
Show 5 more Red Hat advisories
- RHSA-2026:36018 Released 2026-07-06 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.22.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.22.1.el9_8, kernel-64k-devel-5.14.0-687.22.1.el9_8 +12
- Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.22.1.el9_8, kernel-64k-5.14.0-687.22.1.el9_8, kernel-64k-core-5.14.0-687.22.1.el9_8 +28
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.22.1.el9_8, libperf-5.14.0-687.22.1.el9_8
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.22.1.el9_8, kernel-rt-64k-5.14.0-687.22.1.el9_8, kernel-rt-64k-core-5.14.0-687.22.1.el9_8 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.22.1.el9_8, kernel-rt-core-5.14.0-687.22.1.el9_8, kernel-rt-debug-5.14.0-687.22.1.el9_8 +9
- RHSA-2026:34911 Released 2026-07-02 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.30.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.30.1.el10_2, kernel-64k-devel-6.12.0-211.30.1.el10_2 +12
- Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.30.1.el10_2, kernel-64k-6.12.0-211.30.1.el10_2, kernel-64k-core-6.12.0-211.30.1.el10_2 +29
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.30.1.el10_2, libperf-6.12.0-211.30.1.el10_2
- Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.30.1.el10_2, kernel-rt-64k-6.12.0-211.30.1.el10_2, kernel-rt-64k-core-6.12.0-211.30.1.el10_2 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.30.1.el10_2, kernel-rt-core-6.12.0-211.30.1.el10_2, kernel-rt-debug-6.12.0-211.30.1.el10_2 +9
- RHSA-2026:34443 Released 2026-07-01 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.135.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.135.1.el9_4, kernel-64k-devel-5.14.0-427.135.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.135.1.el9_4, kernel-5.14.0-427.135.1.el9_4, kernel-64k-5.14.0-427.135.1.el9_4 +29
- Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.135.1.el9_4, kernel-rt-core-5.14.0-427.135.1.el9_4, kernel-rt-debug-5.14.0-427.135.1.el9_4 +9
- Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.135.1.el9_4, kernel-rt-core-5.14.0-427.135.1.el9_4, kernel-rt-debug-5.14.0-427.135.1.el9_4 +11
- RHSA-2026:34094 Released 2026-07-01 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.125.1.el9_6, libperf-5.14.0-570.125.1.el9_6
- Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.125.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.125.1.el9_6, kernel-64k-devel-5.14.0-570.125.1.el9_6 +12
- Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.125.1.el9_6, kernel-64k-5.14.0-570.125.1.el9_6, kernel-64k-core-5.14.0-570.125.1.el9_6 +28
- Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.125.1.el9_6, kernel-rt-64k-5.14.0-570.125.1.el9_6, kernel-rt-64k-core-5.14.0-570.125.1.el9_6 +21
- Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.125.1.el9_6, kernel-rt-core-5.14.0-570.125.1.el9_6, kernel-rt-debug-5.14.0-570.125.1.el9_6 +11
- RHSA-2026:33215 Released 2026-06-29 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.84.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.84.1.el10_0, kernel-64k-devel-6.12.0-55.84.1.el10_0 +12
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.84.1.el10_0, kernel-64k-6.12.0-55.84.1.el10_0, kernel-64k-core-6.12.0-55.84.1.el10_0 +28
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.84.1.el10_0, libperf-6.12.0-55.84.1.el10_0
- Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.84.1.el10_0, kernel-rt-64k-6.12.0-55.84.1.el10_0, kernel-rt-64k-core-6.12.0-55.84.1.el10_0 +21
- Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.84.1.el10_0, kernel-rt-core-6.12.0-55.84.1.el10_0, kernel-rt-debug-6.12.0-55.84.1.el10_0 +11
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:34094 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:34911 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:36018 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:34443 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:33215 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:34094 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:34911, RHSA-2026:55618 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:36018, RHSA-2026:55763 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Fixed | RHSA-2026:34443 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:33215 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2026:34094, RHSA-2026:56225 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:34911 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:36018 |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:33215 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2026:34911 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2026:36018 |
| Red Hat Enterprise Linux Real Time E4S (v.9.4) | Fixed | RHSA-2026:34443 |
| Red Hat Enterprise Linux Real Time EUS (v. 10.0) | Fixed | RHSA-2026:33215 |
| Red Hat Enterprise Linux Real Time EUS (v.9.6) | Fixed | RHSA-2026:34094 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2026:34911 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2026:36018 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) | Fixed | RHSA-2026:34443 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) | Fixed | RHSA-2026:33215 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) | Fixed | RHSA-2026:34094 |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-46244
- 2026-10-03 Alias added: GHSA-fgx8-r5g7-5cr9
- 2026-10-10 Priority changed: MEDIUM → LOW
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → MEDIUM
- 2026-10-19 Weakness changed · CISA ADP
- 2026-10-29 Affected versions changed · Red Hat
References
Patch 5
- https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273
- https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582
- https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601
- https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce
- https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c
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- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-46244 · CVE Program
- CVE-2026-46244 · NVD
- FIRST EPSS
- GHSA-fgx8-r5g7-5cr9 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-46244 · Red Hat security data · CC BY 4.0
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