Description
There exists a use-after-free in io_uring in the Linux kernel. Signalfd_poll() and binder_poll() use a waitqueue whose lifetime is the current task. It will send a POLLFREE notification to all waiters before the queue is freed. Unfortunately, the io_uring poll doesn't handle POLLFREE. This allows a use-after-free to occur if a signalfd or binder fd is polled with io_uring poll, and the waitqueue gets freed. We recommend upgrading past commit fc78b2fc21f10c4c9c4d5d659a685710ffa63659
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Kernel | unspecified – < fc78b2fc21f10c4c9c4d5d659a685710ffa63659 | fc78b2fc21f10c4c9c4d5d659a685710ffa63659 |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.17.3-1 | — |
| Debian 13 | linux | 5.17.3-1 | — |
| Debian 12 | linux | 5.17.3-1 | — |
| Debian 11 | linux | 5.10.149-1 | DSA-5257-1 |
| Debian 10 | linux-5.10 | 5.10.149-2~deb10u1 | DLA-3173-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-50.56 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1021.25 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1021.26 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1024.30.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1019.25 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1017.20 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1004.6 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1015.17 | USN-5683-1 |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1017.22 | USN-5703-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1019.23 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1015.15 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1019.24 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1016.18 | USN-5667-1 |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv | 5.15.0-1020.23 | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-128.144 | USN-5668-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1086.93 | USN-5668-1 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1021.25~20.04.1 | USN-5667-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1094.100 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1021.26~20.04.1 | USN-5667-1 |
| Ubuntu 20.04 LTS | linux-azure-fde | 5.4.0-1092.97+cvm1.1 | USN-5706-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1047.52 | USN-5668-1 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1090.98 | USN-5677-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1021.28~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1084.90 | USN-5668-1 |
| Ubuntu 20.04 LTS | linux-gke-5.15 | 5.15.0-1019.23~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1054.57 | USN-5668-1 |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1005.7~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-50.56~20.04.1 | USN-5667-1 |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1034.38 | USN-5668-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1017.22~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1005.7 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1076.81 | USN-5668-1 |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1084.92 | USN-5668-1 |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1019.24~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1071.81 | USN-5677-1 |
| Ubuntu 20.04 LTS | linux-riscv +23 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1022.26~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1086.93~18.04.1 | USN-5682-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1094.100~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1092.101~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-128.144~18.04.1 | USN-5668-1 |
| Ubuntu 18.04 LTS | linux-ibm-5.4 | 5.4.0-1034.38~18.04.1 | USN-5668-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1084.92~18.04.1 | USN-5677-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1071.81~18.04.1 | USN-5677-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1022.22 | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1086.93+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1094.100+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1062.70 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1092.101+fips1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.38.1 | SUSE-SU-2022:4585-1 |
| SLES 15 SP4 | kernel-azure +2 | 5.14.21-150400.14.28.1 | SUSE-SU-2022:4504-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.38.1.150400.24.13.2 | SUSE-SU-2022:4585-1 |
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-150300.59.101.1 | SUSE-SU-2022:4053-1 |
| SLES 15 SP3 | kernel-azure +2 | 5.3.18-150300.38.83.1 | SUSE-SU-2022:3897-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-150300.59.101.1.150300.18.58.1 | SUSE-SU-2022:4053-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-150200.24.139.1.150200.9.65.2 | SUSE-SU-2022:4589-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.139.1 | SUSE-SU-2022:4589-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP2 | kernel-default-base | 5.3.18-150200.24.139.1.150200.9.65.2 | SUSE-SU-2022:4589-1 |
| SLES for SAP 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.139.1 | SUSE-SU-2022:4589-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.109.1 | SUSE-SU-2022:4614-1 |
| SLE Micro 5.2 | kernel-default | 5.3.18-150300.59.101.1 | SUSE-SU-2022:4053-1 |
| SLE Micro 5.2 | kernel-default-base | 5.3.18-150300.59.101.1.150300.18.58.1 | SUSE-SU-2022:4053-1 |
| SLE Micro 5.2 | kernel-rt | 5.3.18-150300.109.1 | SUSE-SU-2022:3929-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-150300.59.101.1 | SUSE-SU-2022:4053-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-150300.59.101.1.150300.18.58.1 | SUSE-SU-2022:4053-1 |
| SLE Micro 5.1 | kernel-rt | 5.3.18-150300.109.1 | SUSE-SU-2022:3929-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.38.1 | SUSE-SU-2022:4585-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4-RT_Update_1 | 1-150400.1.3.1 | SUSE-SU-2022:4617-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_6 | 1-150400.9.3.2 | SUSE-SU-2022:4585-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-150300.59.101.1 | SUSE-SU-2022:4053-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_26 | 1-150300.7.3.1 | SUSE-SU-2022:4053-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-150200.24.139.1 | SUSE-SU-2022:4589-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_32 | 1-150200.5.5.1 | SUSE-SU-2022:4589-1 |
| SLE HPC 15 SP2 | kernel-default-base | 5.3.18-150200.24.139.1.150200.9.65.2 | SUSE-SU-2022:4589-1 |
| SLE HPC 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.139.1 | SUSE-SU-2022:4589-1 |
| SUSE Real Time Module 15 SP4 | kernel-rt +3 | 5.14.21-150400.15.5.1 | SUSE-SU-2022:4617-1 |
| SUSE Real Time Module 15 SP3 | kernel-rt +3 | 5.3.18-150300.109.1 | SUSE-SU-2022:3929-1 |
| SUSE Manager Server 4.1 | kernel-default-base | 5.3.18-150200.24.139.1.150200.9.65.2 | SUSE-SU-2022:4589-1 |
| SUSE Manager Server 4.1 | kernel-docs +5 | 5.3.18-150200.24.139.1 | SUSE-SU-2022:4589-1 |
| SUSE Manager Retail Branch Server 4.1 | kernel-default-base | 5.3.18-150200.24.139.1.150200.9.65.2 | SUSE-SU-2022:4589-1 |
| SUSE Manager Retail Branch Server 4.1 | kernel-docs +4 | 5.3.18-150200.24.139.1 | SUSE-SU-2022:4589-1 |
| SUSE Manager Proxy 4.1 | kernel-default-base | 5.3.18-150200.24.139.1.150200.9.65.2 | SUSE-SU-2022:4589-1 |
| SUSE Manager Proxy 4.1 | kernel-docs +4 | 5.3.18-150200.24.139.1 | SUSE-SU-2022:4589-1 |
| SUSE Enterprise Storage 7 | kernel-default-base | 5.3.18-150200.24.139.1.150200.9.65.2 | SUSE-SU-2022:4589-1 |
| SUSE Enterprise Storage 7 | kernel-docs +5 | 5.3.18-150200.24.139.1 | SUSE-SU-2022:4589-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | dtb-aarch64 | 5.3.18-150300.59.101.1 | SUSE-SU-2022:4585-1, SUSE-SU-2022:4053-1 |
| openSUSE Leap 15.4 | kernel-64kb +9 | 5.14.21-150400.24.38.1 | SUSE-SU-2022:4585-1 |
| openSUSE Leap 15.4 | kernel-azure +2 | 5.14.21-150400.14.28.1 | SUSE-SU-2022:4504-1 |
| openSUSE Leap 15.4 | kernel-default-base | 5.14.21-150400.24.38.1.150400.24.13.2 | SUSE-SU-2022:4585-1 |
| openSUSE Leap 15.4 | kernel-rt +3 | 5.14.21-150400.15.5.1 | SUSE-SU-2022:4617-1 |
| openSUSE Leap 15.3 | dtb-aarch64 +11 | 5.3.18-150300.59.101.1 | SUSE-SU-2022:4053-1 |
| openSUSE Leap 15.3 | kernel-azure +2 | 5.3.18-150300.38.83.1 | SUSE-SU-2022:3897-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-150300.59.101.1.150300.18.58.1 | SUSE-SU-2022:4053-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.2 | kernel-default | 5.3.18-150300.59.101.1 | SUSE-SU-2022:4053-1 |
| openSUSE Leap Micro 5.2 | kernel-default-base | 5.3.18-150300.59.101.1.150300.18.58.1 | SUSE-SU-2022:4053-1 |
| openSUSE Leap Micro 5.2 | kernel-rt | 5.3.18-150300.109.1 | SUSE-SU-2022:3929-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.10-15.42 | 1.0-0.amzn2023 | ALAS2023-2023-070 |
| Amazon Linux 2023 | perf +12 | 6.1.10-15.42.amzn2023 | ALAS2023-2023-070 |
Advisories 19
- USN-5668-1 linux, linux-aws, linux-bluefield, linux-gke, linux-gkeop, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-kvm, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-5683-1 linux-ibm vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-5703-1 linux-intel-iotg vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-5667-1 linux, linux-aws, linux-aws-5.15, linux-azure, linux-azure-5.15, linux-gcp, linux-gke, linux-gkeop, linux-hwe-5.15, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-5677-1 linux-gcp, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-5682-1 linux-aws-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-5706-1 linux-azure-fde vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DSA-5257-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3173-1 linux-5.10 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2022:3929-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3897-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4617-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4585-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4053-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4589-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4504-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2022:4614-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2023-2023-070 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 10, 2024
- WID-SEC-2022-1456 Linux Kernel: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Dec 26, 2022
References
- https://kernel.dance/#fc78b2fc21f10c4c9c4d5d659a685710ffa63659
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?h=linux-5.4.y&id=fc78b2fc21f10c4c9c4d5d659a685710ffa63659
- DSA-5257 vendor-advisory
- [debian-lts-announce] 20221101 [SECURITY] [DLA 3173-1] linux-5.10 security update mailing-list
- https://security.netapp.com/advisory/ntap-20230216-0003/