CVE-2026-31669
published 2026-04-24CVE-2026-31669: In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in __inet_lookup_established The ehash table lookups are…
PriorityP348critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.46%
37.3th percentile
In the Linux kernel, the following vulnerability has been resolved:
mptcp: fix slab-use-after-free in __inet_lookup_established
The ehash table lookups are lockless and rely on
SLAB_TYPESAFE_BY_RCU to guarantee socket memory stability
during RCU read-side critical sections. Both tcp_prot and
tcpv6_prot have their slab caches created with this flag
via proto_register().
However, MPTCP's mptcp_subflow_init() copies tcpv6_prot into
tcpv6_prot_override during inet_init() (fs_initcall, level 5),
before inet6_init() (module_init/device_initcall, level 6) has
called proto_register(&tcpv6_prot). At that point,
tcpv6_prot.slab is still NULL, so tcpv6_prot_override.slab
remains NULL permanently.
This causes MPTCP v6 subflow child sockets to be allocated via
kmalloc (falling into kmalloc-4k) instead of the TCPv6 slab
cache. The kmalloc-4k cache lacks SLAB_TYPESAFE_BY_RCU, so
when these sockets are freed without SOCK_RCU_FREE (which is
cleared for child sockets by design), the memory can be
immediately reused. Concurrent ehash lookups under
rcu_read_lock can then access freed memory, triggering a
slab-use-after-free in __inet_lookup_established.
Fix this by splitting the IPv6-specific initialization out of
mptcp_subflow_init() into a new mptcp_subflow_v6_init(), called
from mptcp_proto_v6_init() before protocol registration. This
ensures tcpv6_prot_override.slab correctly inherits the
SLAB_TYPESAFE_BY_RCU slab cache.
Affected
68 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= b19bc2945b40b9fd38e835700907ffe8534ef0de < f6e1f25fa5e733570f6d6fe37a4dfed2a0deba47 | f6e1f25fa5e733570f6d6fe37a4dfed2a0deba47 |
| linux | linux | >= b19bc2945b40b9fd38e835700907ffe8534ef0de < fb1f54b7d16f393b8b65d328410f78b4beea8fcc | fb1f54b7d16f393b8b65d328410f78b4beea8fcc |
| linux | linux | >= b19bc2945b40b9fd38e835700907ffe8534ef0de < 3fd6547f5b8ac99687be6d937a0321efda760597 | 3fd6547f5b8ac99687be6d937a0321efda760597 |
| linux | linux | >= b19bc2945b40b9fd38e835700907ffe8534ef0de < eb9c6aeb512f877cf397deb1e4526f646c70e4a7 | eb9c6aeb512f877cf397deb1e4526f646c70e4a7 |
| linux | linux | >= b19bc2945b40b9fd38e835700907ffe8534ef0de < 15fa9ead4d5e6b6b9c794e84144146c917f2cb62 | 15fa9ead4d5e6b6b9c794e84144146c917f2cb62 |
| linux | linux | >= b19bc2945b40b9fd38e835700907ffe8534ef0de < b313e9037d98c13938740e5ebda7852929366dff | b313e9037d98c13938740e5ebda7852929366dff |
| linux | linux | >= b19bc2945b40b9fd38e835700907ffe8534ef0de < 9b55b253907e7431210483519c5ad711a37dafa1 | 9b55b253907e7431210483519c5ad711a37dafa1 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.12.1 < 5.15.203 | 5.15.203 |
| linux | linux_kernel | >= 5.16 < 6.1.169 | 6.1.169 |
| linux | linux_kernel | >= 6.13 < 6.18.23 | 6.18.23 |
| linux | linux_kernel | >= 6.19 < 6.19.13 | 6.19.13 |
| linux | linux_kernel | >= 6.2 < 6.6.135 | 6.6.135 |
| linux | linux_kernel | >= 6.7 < 6.12.82 | 6.12.82 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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Red Hat
kernel: mptcp: fix slab-use-after-free in __inet_lookup_established
vendor_redhat·2026-04-24·CVSS 7.0
CVE-2026-31669 [HIGH] CWE-763 kernel: mptcp: fix slab-use-after-free in __inet_lookup_established
kernel: mptcp: fix slab-use-after-free in __inet_lookup_established
A flaw was found in the Linux kernel's Multipath TCP (MPTCP) implementation. Due to incorrect memory allocation for IPv6 subflow child sockets, a use-after-free vulnerability exists. A remote attacker could exploit this by triggering concurrent lookups in the kernel's hash table, potentially leading to a denial of service or arbitrary code execution.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - Affected
Package: kernel-rt (Red Hat Enterprise Linux 8) - Affected
Package: kernel
GHSA
GHSA-29w7-pv74-wpq7: In the Linux kernel, the following vulnerability has been resolved:
mptcp: fix slab-use-after-free in __inet_lookup_established
The ehash table look
ghsa_unreviewed·2026-04-24
CVE-2026-31669 GHSA-29w7-pv74-wpq7: In the Linux kernel, the following vulnerability has been resolved:
mptcp: fix slab-use-after-free in __inet_lookup_established
The ehash table look
In the Linux kernel, the following vulnerability has been resolved:
mptcp: fix slab-use-after-free in __inet_lookup_established
The ehash table lookups are lockless and rely on
SLAB_TYPESAFE_BY_RCU to guarantee socket memory stability
during RCU read-side critical sections. Both tcp_prot and
tcpv6_prot have their slab caches created with this flag
via proto_register().
However, MPTCP's mptcp_subflow_init() copies tcpv6_prot into
tcpv6_prot_override during inet_init() (fs_initcall, level 5),
before inet6_init() (module_init/device_initcall, level 6) has
called proto_register(&tcpv6_prot). At that point,
tcpv6_prot.slab is still NULL, so tcpv6_prot_override.slab
remains NULL permanently.
This causes MPTCP v6 subflow child sockets to be allocated via
kmalloc (falling into kmalloc-4k) inst
VulDB
Linux Kernel up to 6.19.12 mptcp proto_register use after free
vuldb·2026-04-24
CVE-2026-31669 [CRITICAL] Linux Kernel up to 6.19.12 mptcp proto_register use after free
A vulnerability was found in Linux Kernel up to 6.19.12. It has been declared as critical. Affected by this issue is the function proto_register of the component mptcp. Executing a manipulation can lead to use after free.
This vulnerability is registered as CVE-2026-31669. The attack requires access to the local network. No exploit is available.
It is recommended to upgrade the affected component.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/15fa9ead4d5e6b6b9c794e84144146c917f2cb62https://git.kernel.org/stable/c/3fd6547f5b8ac99687be6d937a0321efda760597https://git.kernel.org/stable/c/9b55b253907e7431210483519c5ad711a37dafa1https://git.kernel.org/stable/c/b313e9037d98c13938740e5ebda7852929366dffhttps://git.kernel.org/stable/c/eb9c6aeb512f877cf397deb1e4526f646c70e4a7https://git.kernel.org/stable/c/f6e1f25fa5e733570f6d6fe37a4dfed2a0deba47https://git.kernel.org/stable/c/fb1f54b7d16f393b8b65d328410f78b4beea8fcchttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
2026-04-24
Published