Skip to content
OpenAdvisories
High · 7.8 CVE-2024-35910 EUVD-2024-35628GHSA-f8qw-j52x-qgrm

tcp: properly terminate timers for kernel sockets

Published May 19, 2024 · Updated Oct 15, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fips Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-intel Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lts-xenial Package: linux-nvidia Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.5 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

In the Linux kernel, the following vulnerability has been resolved:

tcp: properly terminate timers for kernel sockets

We had various syzbot reports about tcp timers firing after
the corresponding netns has been dismantled.

Fortunately Josef Bacik could trigger the issue more often,
and could test a patch I wrote two years ago.

When TCP sockets are closed, we call inet_csk_clear_xmit_timers()
to 'stop' the timers.

inet_csk_clear_xmit_timers() can be called from any context,
including when socket lock is held.
This is the reason it uses sk_stop_timer(), aka del_timer().
This means that ongoing timers might finish much later.

For user sockets, this is fine because each running timer
holds a reference on the socket, and the user socket holds
a reference on the netns.

For kernel sockets, we risk that the netns is freed before
timer can complete, because kernel sockets do not hold
reference on the netns.

This patch adds inet_csk_clear_xmit_timers_sync() function
that using sk_stop_timer_sync() to make sure all timers
are terminated before the kernel socket is released.
Modules using kernel sockets close them in their netns exit()
handler.

Also add sock_not_owned_by_me() helper to get LOCKDEP
support : inet_csk_clear_xmit_timers_sync() must not be called
while socket lock is held.

It is very possible we can revert in the future commit
3a58f13a881e ("net: rds: acquire refcount on TCP sockets")
which attempted to solve the issue in rds only.
(net/smc/af_smc.c and net/mptcp/subflow.c have similar code)

We probably can remove the check_net() tests from
tcp_out_of_resources() and __tcp_close() in the future.

Affected products

VendorProductAffectedFixed
Linux Linux 4.2 4.19.312

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 linux 6.8.9-1 —
Debian 13 linux 6.8.9-1 —
Debian 12 linux 6.1.85-1 —
Debian 10 linux 4.19.316-1 DLA-3840-1
Debian 10 linux-5.10 5.10.216-1~deb10u1 DLA-3842-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1047.49 —
Ubuntu 24.04 LTS linux 6.8.0-38.38 USN-6893-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1011.12 USN-6893-3
Ubuntu 24.04 LTS linux-azure 6.8.0-1010.10 USN-6893-1
Ubuntu 24.04 LTS linux-gcp 6.8.0-1010.11 USN-6893-1
Ubuntu 24.04 LTS linux-gke 6.8.0-1006.9 USN-6893-2
Ubuntu 24.04 LTS linux-ibm +2 6.8.0-1008.8 USN-6918-1, USN-6893-1
Ubuntu 24.04 LTS linux-intel 6.8.0-1007.14 USN-6893-1
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1009.9 USN-6893-2
Ubuntu 24.04 LTS linux-raspi 6.8.0-1007.7 USN-6893-1
Ubuntu 24.04 LTS linux-riscv +1 6.8.0-38.38.1 USN-6893-1
Ubuntu 22.04 LTS linux +1 5.15.0-116.126 USN-6898-2, USN-6898-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1065.71 USN-6898-3
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1011.12~22.04.1 —
Ubuntu 22.04 LTS linux-azure 5.15.0-1068.77 USN-6917-1
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1010.10~22.04.1 —
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1068.77.1 USN-6917-1
Ubuntu 22.04 LTS linux-gcp 5.15.0-1064.72 USN-6898-1
Ubuntu 22.04 LTS linux-gke 5.15.0-1062.68 USN-6898-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1048.55 USN-6898-1
Ubuntu 22.04 LTS linux-ibm +1 5.15.0-1058.61 USN-6919-1, USN-6898-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1060.66 USN-6898-1
Ubuntu 22.04 LTS linux-kvm 5.15.0-1062.67 USN-6898-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1060.61 USN-6898-1
Ubuntu 22.04 LTS linux-nvidia-6.8 6.8.0-1009.9~22.04.1 —
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1026.26 —
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1015.15 —
Ubuntu 22.04 LTS linux-oracle 5.15.0-1063.69 USN-6898-1
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1008.8~22.04.1 —
Ubuntu 22.04 LTS linux-riscv +31 No fix yet —
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1035.39 USN-7019-1
Ubuntu 20.04 LTS linux 5.4.0-189.209 USN-6896-1
Ubuntu 20.04 LTS linux-aws 5.4.0-1128.138 USN-6896-5
Ubuntu 20.04 LTS linux-aws-5.15 5.15.0-1065.71~20.04.1 USN-6898-4
Ubuntu 20.04 LTS linux-azure 5.4.0-1133.140 USN-6896-1
Ubuntu 20.04 LTS linux-azure-5.15 5.15.0-1068.77~20.04.1 USN-6917-1
Ubuntu 20.04 LTS linux-azure-fde-5.15 5.15.0-1068.77~20.04.1.1 USN-6917-1
Ubuntu 20.04 LTS linux-bluefield 5.4.0-1088.95 USN-6896-1
Ubuntu 20.04 LTS linux-gcp 5.4.0-1132.141 USN-6896-1
Ubuntu 20.04 LTS linux-gcp-5.15 5.15.0-1065.73~20.04.1 USN-6927-1
Ubuntu 20.04 LTS linux-gke +26 No fix yet —
Ubuntu 20.04 LTS linux-gkeop 5.4.0-1095.99 USN-6896-1
Ubuntu 20.04 LTS linux-gkeop-5.15 5.15.0-1048.55~20.04.1 USN-6898-1
Ubuntu 20.04 LTS linux-hwe-5.15 +1 5.15.0-116.126~20.04.1 USN-6898-3, USN-6898-2
Ubuntu 20.04 LTS linux-ibm 5.4.0-1075.80 USN-6896-1
Ubuntu 20.04 LTS linux-ibm-5.15 5.15.0-1058.61~20.04.1 USN-6898-2
Ubuntu 20.04 LTS linux-intel-iotg-5.15 5.15.0-1060.66~20.04.1 USN-6898-1
Ubuntu 20.04 LTS linux-iot 5.4.0-1040.41 USN-6896-5
Ubuntu 20.04 LTS linux-kvm 5.4.0-1116.123 USN-6896-1
Ubuntu 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1027.27~20.04.1 —
Ubuntu 20.04 LTS linux-oracle 5.4.0-1127.136 USN-6896-3
Ubuntu 20.04 LTS linux-oracle-5.15 5.15.0-1063.69~20.04.1 USN-6898-2
Ubuntu 20.04 LTS linux-raspi 5.4.0-1112.124 USN-6896-4
Ubuntu 20.04 LTS linux-riscv-5.15 5.15.0-1061.65~20.04.1 —
Ubuntu 20.04 LTS linux-xilinx-zynqmp 5.4.0-1047.51 USN-6896-3
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Show 14 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2006.6 —
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1004.4 —
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1058.60 —
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1066.74 —
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1065.71+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1068.77+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-115.125+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1064.72+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-aws-fips 5.4.0-1128.138+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-azure-fips 5.4.0-1133.140+fips1 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips 5.4.0-1102.112 —
Ubuntu Pro FIPS-updates 20.04 LTS linux-gcp-fips 5.4.0-1132.141+fips1 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 18.04 LTS linux +5 No fix yet —
Ubuntu Pro 18.04 LTS linux-aws-5.4 5.4.0-1128.138~18.04.1 USN-6896-5
Ubuntu Pro 18.04 LTS linux-azure-5.4 5.4.0-1133.140~18.04.1 USN-6896-1
Ubuntu Pro 18.04 LTS linux-gcp-5.4 5.4.0-1132.141~18.04.1 USN-6896-1
Ubuntu Pro 18.04 LTS linux-hwe-5.4 5.4.0-189.209~18.04.1 USN-6896-2
Ubuntu Pro 18.04 LTS linux-ibm-5.4 5.4.0-1075.80~18.04.1 USN-6896-1
Ubuntu Pro 18.04 LTS linux-oracle-5.4 5.4.0-1127.136~18.04.1 USN-6896-2
Ubuntu Pro 18.04 LTS linux-raspi-5.4 5.4.0-1112.124~18.04.1 USN-6896-4
Ubuntu Pro 16.04 LTS linux +7 No fix yet —
Ubuntu Pro 14.04 LTS linux-aws +2 No fix yet —
ReleasePackageFixed inAdvisory
RHEL 8 kernel-rt +12 4.18.0-553.16.1.rt7.357.el8_10 RHSA-2024:5102
RHEL 8 perf +26 4.18.0-553.16.1.el8_10 RHSA-2024:5101
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
RHEL 8.8 EUS perf +26 4.18.0-477.67.1.el8_8 RHSA-2024:5255

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 8 kernel-rt +11 4.18.0-553.16.1.rt7.357.el8_10 ALSA-2024:5102
AlmaLinux 8 perf +24 4.18.0-553.16.1.el8_10 ALSA-2024:5101

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 8 kernel 4.18.0-553.16.1.el8_10 RXSA-2024:5101, RLSA-2024:5101
Rocky Linux 8 kernel-rt 4.18.0-553.16.1.rt7.357.el8_10 RLSA-2024:5102
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +6 6.4.0-150700.53.3.1 SUSE-SU-2025:01951-1
SLES 15 SP7 kernel-azure +2 6.4.0-150700.20.3.1 SUSE-SU-2025:01967-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.3.1.150700.17.2.1 SUSE-SU-2025:01951-1
SLES 15 SP6 kernel-64kb +3 6.4.0-150600.23.47.2 SUSE-SU-2025:1180-1
SLES 15 SP6 kernel-azure +1 6.4.0-150600.8.34.2 SUSE-SU-2025:1177-1
SLES 15 SP6 kernel-coco +3 6.4.0-15061.21.coco15sp6.1 SUSE-SU-2025:01919-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.47.2.150600.12.20.2 SUSE-SU-2025:1180-1
SLES 15 SP6 kernel-docs +2 6.4.0-150600.23.47.1 SUSE-SU-2025:1180-1
SLES 15 SP6 kernel-syms-azure 6.4.0-150600.8.34.1 SUSE-SU-2025:1177-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.255.1 SUSE-SU-2025:1293-1
Show 6 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Micro 6.1 kernel-default-base 6.4.0-28.1.21.6 SUSE-SU-2025:20270-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_6 +1 1-3.1 SUSE-SU-2025:20270-1, SUSE-SU-2025:20260-1
SLE Micro 6.1 kernel-rt +4 6.4.0-28.1 SUSE-SU-2025:20270-1, SUSE-SU-2025:20260-1
SLE Micro 6.0 kernel-default-base 6.4.0-28.1.21.6 SUSE-SU-2025:20192-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_6 +1 1-3.1 SUSE-SU-2025:20192-1, SUSE-SU-2025:20190-1
SLE Micro 6.0 kernel-rt +4 6.4.0-28.1 SUSE-SU-2025:20192-1, SUSE-SU-2025:20190-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.3.1 SUSE-SU-2025:01951-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_1 1-150700.15.3.1 SUSE-SU-2025:01951-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.47.2 SUSE-SU-2025:1180-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_10 1-150600.1.5.1 SUSE-SU-2025:1178-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_10 1-150600.13.5.1 SUSE-SU-2025:1180-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.255.1 SUSE-SU-2025:1293-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_67 1-8.5.1 SUSE-SU-2025:1293-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.34.1 SUSE-SU-2025:1178-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.6 dtb-aarch64 +4 6.4.0-150600.23.47.1 SUSE-SU-2025:1180-1
openSUSE Leap 15.6 kernel-64kb +5 6.4.0-150600.23.47.2 SUSE-SU-2025:1180-1
openSUSE Leap 15.6 kernel-azure +1 6.4.0-150600.8.34.2 SUSE-SU-2025:1177-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.47.2.150600.12.20.2 SUSE-SU-2025:1180-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.34.1 SUSE-SU-2025:1178-1
openSUSE Leap 15.6 kernel-syms-azure 6.4.0-150600.8.34.1 SUSE-SU-2025:1177-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.1.87-99.174 1.0-0.amzn2023 ALAS2023-2024-613
Amazon Linux 2023 perf +14 6.1.87-99.174.amzn2023 ALAS2023-2024-613
Amazon Linux 2 kernel-livepatch-4.14.345-262.561 1.0-0.amzn2 ALAS2-2024-2615
Amazon Linux 2 perf +8 4.14.345-262.561.amzn2 ALAS2-2024-2615

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 8 perf +19 4.18.0-553.16.1.el8_10 ELSA-2024-5101

Advisories 48

References