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TI-2026-31377 Aliases CVE-2026-43198GHSA-rhcj-6wxj-r34p

tcp: fix potential race in tcp_v6_syn_recv_sock()

Priority MEDIUM 49CWE-362Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 41 fixed, 2 without a fix

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: tcp: fix potential race in tcp_v6_syn_recv_sock() Code in tcp_v6_syn_recv_sock() after the call to tcp_v4_syn_recv_sock() is done too late. After tcp_v4_syn_recv_sock(), the child socket is already visible from TCP ehash table and other cpus might use it. Since newinet->pinet6 is still pointing to the listener ipv6_pinfo bad things can happen as syzbot found. Move the problematic code in tcp_v6_mapped_child_init() and call this new helper from tcp_v4_syn_recv_sock() before the ehash insertion. This allows the removal of one tcp_sync_mss(), since tcp_v4_syn_recv_sock() will call it with the correct context.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00298 22nd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.270, 5.15.221, 6.1.188 +5Red Hat: 14 advisoriesRed Hat: 41 fixed, 2 without a fix

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

VendorProductAffected versionsFixed inStatusSource
LinuxLinux2.6.12 and later5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.16, 6.19.6, 7.0Patch availableCNA
  • Linux VendorLinux Affected 2.6.12 and later Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.16, 6.19.6, 7.0 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.12.1 to before 6.18.16; 6.19 to before 6.19.6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*2.6.12VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*2.6.12 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*2.6.12 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*2.6.12 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*2.6.12 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*7.0 rc1VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.12.1 to before 6.18.16; 6.19 to before 6.19.6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* Versions 2.6.12 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* Versions 2.6.12 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* Versions 2.6.12 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* Versions 2.6.12 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* Versions 2.6.12 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.16, 6.19.6, 7.0

Red Hat 14 advisories

  • RHSA-2026:41236 Released 2026-07-17 · Red Hat rating Critical
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-debug-3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-debug-devel-3.10.0-1160.155.1.rt56.1307.el7 +4
  • RHSA-2026:36349 Released 2026-07-07 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.140.1.el8_10, kernel-4.18.0-553.140.1.el8_10, kernel-abi-stablelists-4.18.0-553.140.1.el8_10 +19
    • 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 Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux NFV (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 +9
    • 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
Show 11 more Red Hat advisories
  • RHSA-2026:36216 Released 2026-07-07 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.155.1.el7, kernel-3.10.0-1160.155.1.el7, kernel-abi-whitelists-3.10.0-1160.155.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.155.1.el7, kernel-tools-libs-devel-3.10.0-1160.155.1.el7
  • RHSA-2026:36073 Released 2026-07-07 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.179.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.179.1.el9_2, kernel-64k-devel-5.14.0-284.179.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.179.1.el9_2, kernel-5.14.0-284.179.1.el9_2, kernel-64k-5.14.0-284.179.1.el9_2 +29
  • RHSA-2026:35904 Released 2026-07-06 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.179.1.rt14.464.el9_2, kernel-rt-core-5.14.0-284.179.1.rt14.464.el9_2, kernel-rt-debug-5.14.0-284.179.1.rt14.464.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.179.1.rt14.464.el9_2, kernel-rt-core-5.14.0-284.179.1.rt14.464.el9_2, kernel-rt-debug-5.14.0-284.179.1.rt14.464.el9_2 +11
  • RHSA-2026:35896 Released 2026-07-06 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.197.1.el8_4, kernel-4.18.0-305.197.1.el8_4, kernel-abi-stablelists-4.18.0-305.197.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.197.1.el8_4, kernel-4.18.0-305.197.1.el8_4, kernel-abi-stablelists-4.18.0-305.197.1.el8_4 +14
  • RHSA-2026:35894 Released 2026-07-06 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.199.1.el8_6, kernel-4.18.0-372.199.1.el8_6, kernel-abi-stablelists-4.18.0-372.199.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.199.1.el8_6, kernel-4.18.0-372.199.1.el8_6, kernel-abi-stablelists-4.18.0-372.199.1.el8_6 +14
  • RHSA-2026:35863 Released 2026-07-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.150.1.el8_8, kernel-4.18.0-477.150.1.el8_8, kernel-abi-stablelists-4.18.0-477.150.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.150.1.el8_8, kernel-4.18.0-477.150.1.el8_8, kernel-abi-stablelists-4.18.0-477.150.1.el8_8 +14
  • RHSA-2026:34443 Released 2026-07-01 · Red Hat rating Important
    kernel 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 Important
    kernel 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-2026:33285 Released 2026-06-30 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.20.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.20.1.el9_8, kernel-64k-devel-5.14.0-687.20.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.20.1.el9_8, kernel-64k-5.14.0-687.20.1.el9_8, kernel-64k-core-5.14.0-687.20.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.20.1.el9_8, libperf-5.14.0-687.20.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.20.1.el9_8, kernel-rt-64k-5.14.0-687.20.1.el9_8, kernel-rt-64k-core-5.14.0-687.20.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.20.1.el9_8, kernel-rt-core-5.14.0-687.20.1.el9_8, kernel-rt-debug-5.14.0-687.20.1.el9_8 +9
  • RHSA-2026:33215 Released 2026-06-29 · Red Hat rating Important
    kernel 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
  • RHSA-2026:30129 Released 2026-06-25 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.28.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.28.1.el10_2, kernel-64k-devel-6.12.0-211.28.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.28.1.el10_2, kernel-64k-6.12.0-211.28.1.el10_2, kernel-64k-core-6.12.0-211.28.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.28.1.el10_2, libperf-6.12.0-211.28.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.28.1.el10_2, kernel-rt-64k-6.12.0-211.28.1.el10_2, kernel-rt-64k-core-6.12.0-211.28.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.28.1.el10_2, kernel-rt-core-6.12.0-211.28.1.el10_2, kernel-rt-debug-6.12.0-211.28.1.el10_2 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6Affected—
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:30129
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:33285
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:36073
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-2026:30129
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:36349
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:33285
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:35896
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:35894
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:35863
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:36073
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
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:35896
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:35894
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:35863
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:36349
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:30129
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:33285
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:33215
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-2026:30129
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:33285
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:35904
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-2026:30129
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:33285
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:35904
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
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:36216
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:36216
Red Hat Enterprise Linux for Real Time (v. 7 ELS)Fixed RHSA-2026:41236

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43198
  2. 2026-10-03 Alias added: GHSA-rhcj-6wxj-r34p
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP

References

Patch 3

Other 5

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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