netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- Partial Red Hat: 41 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() nfnl_cthelper_dump_table() has a 'goto restart' that jumps to a label inside the for loop body. When the "last" helper saved in cb->args[1] is deleted between dump rounds, every entry fails the (cur != last) check, so cb->args[1] is never cleared. The for loop finishes with cb->args[0] == nf_ct_helper_hsize, and the 'goto restart' jumps back into the loop body bypassing the bounds check, causing an 8-byte out-of-bounds read on nf_ct_helper_hash[nf_ct_helper_hsize]. The 'goto restart' block was meant to re-traverse the current bucket when "last" is no longer found, but it was placed after the for loop instead of inside it. Move the block into the for loop body so that the restart only occurs while cb->args[0] is still within bounds. BUG: KASAN: slab-out-of-bounds in nfnl_cthelper_dump_table+0x9f/0x1b0 Read of size 8 at addr ffff888104ca3000 by task poc_cthelper/131 Call Trace: nfnl_cthelper_dump_table+0x9f/0x1b0 netlink_dump+0x333/0x880 netlink_recvmsg+0x3e2/0x4b0 sock_recvmsg+0xde/0xf0 __sys_recvfrom+0x150/0x200 __x64_sys_recvfrom+0x76/0x90 do_syscall_64+0xc3/0x6e0 Allocated by task 1: __kvmalloc_node_noprof+0x21b/0x700 nf_ct_alloc_hashtable+0x65/0xd0 nf_conntrack_helper_init+0x21/0x60 nf_conntrack_init_start+0x18d/0x300 nf_conntrack_standalone_init+0x12/0xc0
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
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 | 3.6 and later | 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9, 7.0 | Patch available | CNA |
- Linux VendorLinux Affected 3.6 and later Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9, 7.0 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.6 to before 5.10.253; 5.11 to before 5.15.203; 5.16 to before 6.1.167; 6.2 to before 6.6.130; 6.7 to before 6.12.78; 6.13 to before 6.18.19; 6.19 to before 6.19.9 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | 7.0 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* | 7.0 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* | 7.0 rc3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.6 to before 5.10.253; 5.11 to before 5.15.203; 5.16 to before 6.1.167; 6.2 to before 6.6.130; 6.7 to before 6.12.78; 6.13 to before 6.18.19; 6.19 to before 6.19.9 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* Versions 7.0 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* Versions 7.0 rc3 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9, 7.0
Red Hat 14 advisories
- RHSA-2026:95721 Released 2026-11-05 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.169.1.rt56.1321.el7, kernel-rt-debug-3.10.0-1160.169.1.rt56.1321.el7, kernel-rt-debug-devel-3.10.0-1160.169.1.rt56.1321.el7 +4
- RHSA-2026:95556 Released 2026-11-05 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.169.1.el7, kernel-3.10.0-1160.169.1.el7, kernel-abi-whitelists-3.10.0-1160.169.1.el7 +11
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.169.1.el7, kernel-tools-libs-devel-3.10.0-1160.169.1.el7
- RHSA-2026:93047 Released 2026-10-30 · Red Hat rating Importantkernel-rt security, bug fix, and enhancement update
- Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-core-5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-debug-5.14.0-284.200.1.rt14.485.el9_2 +9
- Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-core-5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-debug-5.14.0-284.200.1.rt14.485.el9_2 +11
Show 11 more Red Hat advisories
- RHSA-2026:92993 Released 2026-10-30 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.200.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.200.1.el9_2, kernel-64k-devel-5.14.0-284.200.1.el9_2 +10
- Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.200.1.el9_2, kernel-5.14.0-284.200.1.el9_2, kernel-64k-5.14.0-284.200.1.el9_2 +29
- RHSA-2026:91492 Released 2026-10-28 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.152.1.el9_6, libperf-5.14.0-570.152.1.el9_6
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- Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.152.1.el9_6, kernel-64k-5.14.0-570.152.1.el9_6, kernel-64k-core-5.14.0-570.152.1.el9_6 +28
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- RHSA-2026:85000 Released 2026-10-19 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.223.1.el8_6, kernel-4.18.0-372.223.1.el8_6, kernel-abi-stablelists-4.18.0-372.223.1.el8_6 +14
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- RHSA-2026:84793 Released 2026-10-19 · Red Hat rating Importantkernel security update
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- RHSA-2026:83707 Released 2026-10-16 · Red Hat rating Importantkernel security, bug fix, and enhancement update
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- RHSA-2026:61887 Released 2026-09-01 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.50.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.50.1.el10_2, kernel-64k-devel-6.12.0-211.50.1.el10_2 +12
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- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.140.1.el8_10
- RHSA-2026:36348 Released 2026-07-07 · Red Hat rating Importantkernel-rt security, bug fix, and enhancement update
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- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.140.1.rt7.481.el8_10, kernel-rt-core-4.18.0-553.140.1.rt7.481.el8_10, kernel-rt-debug-4.18.0-553.140.1.rt7.481.el8_10 +7
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:91492 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:61887 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:51035 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:92993 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:91489 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:83707 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:91492 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:61887 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2026:36349 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:51035 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2026:84677 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2026:85000 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2026:84793 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2026:92993 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Fixed | RHSA-2026:91489 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:83707 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2026:91492 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:84677 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) | Fixed | RHSA-2026:85000 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2026:84793 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:36349 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:61887 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:51035 |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:83707 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2026:36348 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2026:36348 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2026:61887 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2026:51035 |
| Red Hat Enterprise Linux Real Time E4S (v.9.2) | Fixed | RHSA-2026:93047 |
| Red Hat Enterprise Linux Real Time E4S (v.9.4) | Fixed | RHSA-2026:91489 |
| Red Hat Enterprise Linux Real Time EUS (v. 10.0) | Fixed | RHSA-2026:83707 |
| Red Hat Enterprise Linux Real Time EUS (v.9.6) | Fixed | RHSA-2026:91492 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2026:61887 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2026:51035 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) | Fixed | RHSA-2026:93047 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) | Fixed | RHSA-2026:91489 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) | Fixed | RHSA-2026:83707 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) | Fixed | RHSA-2026:91492 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:95556 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:95556 |
| Red Hat Enterprise Linux for Real Time (v. 7 ELS) | Fixed | RHSA-2026:95721 |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-43450
- 2026-10-03 Alias added: GHSA-4jv3-xpmj-f4vf
- 2026-10-18 Fix available: RHSA-2026:83707 · Red Hat
- 2026-10-18 Fix available: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) +2 · Red Hat
- 2026-10-19 Fix available: RHSA-2026:84677 · Red Hat
- 2026-10-19 Fix available: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) · Red Hat
- 2026-10-20 Fix available: RHSA-2026:84793 · Red Hat
- 2026-10-20 Fix available: RHSA-2026:85000 · Red Hat
- 2026-10-20 Fix available: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) +1 · Red Hat
- 2026-10-29 Fix available: RHSA-2026:91489 · Red Hat
- 2026-10-29 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4) +1 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91492 · Red Hat
- 2026-10-30 Fix available: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6) +2 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:93047 · Red Hat
- 2026-10-30 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2), Red Hat Enterprise Linux Real Time E4S (v.9.2) +1 · Red Hat
- 2026-10-31 Fix available: RHSA-2026:92993 · Red Hat
- 2026-11-06 Fix available: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · Red Hat
- 2026-11-06 Fix available: RHSA-2026:95556 · Red Hat
- 2026-11-06 Fix available: Red Hat Enterprise Linux for Real Time (v. 7 ELS) · Red Hat
- 2026-11-06 Fix available: RHSA-2026:95721 · Red Hat
- 2026-11-06 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/0605e1985a95d4334a67869aee45a47e82301abf
- https://git.kernel.org/stable/c/92441f6d9405a0c18d03f278b395e782f79a4a30
- https://git.kernel.org/stable/c/3cc328ffc32ddb389cba7b78b6aa95d995c2876e
- https://git.kernel.org/stable/c/4a1f6ee69267a5f524102c028981410eeacfa3da
- https://git.kernel.org/stable/c/894c5780ddadd5fde0e16f66587918e6be1504c4
- https://git.kernel.org/stable/c/05018cd9370f77bb18fbf6e15ff33c7a06f10b3c
- https://git.kernel.org/stable/c/61b3a1f8621df1a5928118313f133996f6a786db
- https://git.kernel.org/stable/c/6dcee8496d53165b2d8a5909b3050b62ae71fe89
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Sources
- CVE-2026-43450 · CVE Program
- CVE-2026-43450 · NVD
- FIRST EPSS
- GHSA-4jv3-xpmj-f4vf · GitHub Advisory Database · CC BY 4.0
- CVE-2026-43450 · Red Hat security data · CC BY 4.0
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