Description
The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
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 | 5.10.24-1 | — |
| Debian 13 | linux | 5.10.24-1 | — |
| Debian 12 | linux | 5.10.24-1 | — |
| Debian 9 | linux | 4.9.303-1 | DLA-2940-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-73.82 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1048.50 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1047.49 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1043.46 | — |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1043.45 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1015.16 | — |
| Ubuntu 20.04 LTS | linux-hwe-5.8 | 5.8.0-55.62~20.04.1 | USN-4984-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1039.40 | — |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1021.22 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1045.49 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1035.38 | — |
| Ubuntu 20.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.8 | 5.8.0-26.28~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-144.148 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1103.110 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1048.50~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1115.128 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1047.49~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1022.26 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1100.113 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1043.46~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1043.45~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1015.16~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-73.82~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1092.94 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1072.80 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1044.47~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1035.38~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1086.91 | USN-4979-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1103.112 | USN-4979-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 20.04 LTS | linux-aws-fips | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2045.47 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2027.30 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1060.68 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1072.78 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-222.255 | USN-5343-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1138.152 | USN-5343-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1103.110~16.04.1 | USN-4979-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1115.128~16.04.1 | USN-4979-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1100.113~16.04.1 | USN-4979-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-144.148~16.04.1 | USN-4979-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1103.112 | USN-5343-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1072.80~16.04.1 | USN-4979-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1102.107 | USN-5343-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1115.128~14.04.1 | USN-4979-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-222.255~14.04.1 | USN-5343-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-348.rt7.130.el8 | RHSA-2021:4140 |
| RHEL 8 | perf +26 | 4.18.0-348.el8 | RHSA-2021:4356 |
| RHEL 7 | kernel-rt +10 | 3.10.0-1160.36.2.rt56.1179.el7 | RHSA-2021:2726 |
| RHEL 7 | perf +18 | 3.10.0-1160.36.2.el7 | RHSA-2021:2725 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-tools-libs-devel | 4.18.0-348.el8 | ALSA-2021:4356 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-59.34.1 | SUSE-SU-2021:3675-1 |
| SLES 15 SP3 | kernel-azure +1 | 5.3.18-38.28.2 | SUSE-SU-2021:3641-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-59.34.1.18.21.1 | SUSE-SU-2021:3675-1 |
| SLES 15 SP3 | kernel-syms-azure | 5.3.18-38.28.1 | SUSE-SU-2021:3641-1 |
| SLES 15 SP1 | kernel-docs +4 | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SLES 15 SP1 | kernel-obs-build | 4.12.14-197.102.1 | SUSE-SU-2021:3876-1 |
| SLES 15 | kernel-docs +1 | 4.12.14-150.78.2 | SUSE-SU-2021:3969-1 |
| SLES 15 | kernel-syms +4 | 4.12.14-150.78.1 | SUSE-SU-2021:3969-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.98.1 | SUSE-SU-2021:3748-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.161.1 | SUSE-SU-2021:3929-1 |
| SLES 11 SP4 | kernel-ec2 +8 | 3.0.101-108.132.1 | SUSE-SU-2021:14849-1 |
| SLES for SAP 15 SP1 | kernel-docs +3 | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SLES for SAP 15 SP1 | kernel-obs-build | 4.12.14-197.102.1 | SUSE-SU-2021:3876-1 |
| SLES for SAP 15 | kernel-docs +1 | 4.12.14-150.78.2 | SUSE-SU-2021:3969-1 |
| SLES for SAP 15 | kernel-syms +3 | 4.12.14-150.78.1 | SUSE-SU-2021:3969-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.98.1 | SUSE-SU-2021:3748-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.65.1 | SUSE-SU-2021:3723-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-59.34.1 | SUSE-SU-2021:3675-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-59.34.1.18.21.1 | SUSE-SU-2021:3675-1 |
| SLE Micro 5.1 | kernel-rt | 5.3.18-60.1 | SUSE-SU-2021:3642-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-59.34.1 | SUSE-SU-2021:3675-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_9 | 1-7.3.1 | SUSE-SU-2021:3675-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_27 | 1-3.3.1 | SUSE-SU-2021:3876-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.78.1 | SUSE-SU-2021:3969-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_26 | 1-1.3.1 | SUSE-SU-2021:3969-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.98.1 | SUSE-SU-2021:3748-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_25 | 1-8.7.1 | SUSE-SU-2021:3748-1 |
| SLE HPC 15 SP1 | kernel-docs +3 | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SLE HPC 15 SP1 | kernel-obs-build | 4.12.14-197.102.1 | SUSE-SU-2021:3876-1 |
| SLE HPC 15 | kernel-docs +1 | 4.12.14-150.78.2 | SUSE-SU-2021:3969-1 |
| SLE HPC 15 | kernel-syms +3 | 4.12.14-150.78.1 | SUSE-SU-2021:3969-1 |
| SUSE Real Time Module 15 SP3 | kernel-rt +3 | 5.3.18-60.1 | SUSE-SU-2021:3642-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.150.1 | SUSE-SU-2021:3935-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_41 | 1-4.3.1 | SUSE-SU-2021:3935-1 |
| SUSE Enterprise Storage 6 | kernel-docs +3 | 4.12.14-197.102.2 | SUSE-SU-2021:3876-1 |
| SUSE Enterprise Storage 6 | kernel-obs-build | 4.12.14-197.102.1 | SUSE-SU-2021:3876-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | dtb-aarch64 +7 | 5.3.18-59.34.1 | openSUSE-SU-2021:3675-1 |
| openSUSE Leap 15.3 | kernel-azure +1 | 5.3.18-38.28.2 | openSUSE-SU-2021:3641-1 |
| openSUSE Leap 15.3 | kernel-debug +4 | 4.12.14-197.102.2 | openSUSE-SU-2021:3876-1, openSUSE-SU-2021:3675-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-59.34.1.18.21.1 | openSUSE-SU-2021:3675-1 |
| openSUSE Leap 15.3 | kernel-syms-azure | 5.3.18-38.28.1 | openSUSE-SU-2021:3641-1 |
| openSUSE Leap 15.2 | kernel-default-base | 5.3.18-lp152.102.1.lp152.8.49.1 | openSUSE-SU-2021:1477-1 |
| openSUSE Leap 15.2 | kernel-docs +8 | 5.3.18-lp152.102.1 | openSUSE-SU-2021:1477-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.10.78.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +8 | 4.14.35-2047.505.4.el7uek | ELSA-2021-9362, ELSA-2021-9349 |
| Oracle Linux 7 | kernel-uek-container | 4.14.35-2047.505.4.el7 | ELSA-2021-9363, ELSA-2021-9351 |
| Oracle Linux 7 | kernel-uek-container-debug | 5.4.17-2102.203.5.el8 | ELSA-2021-9363 |
| Oracle Linux 7 | perf +12 | 3.10.0-1160.36.2.el7 | ELSA-2021-9362, ELSA-2021-9349, ELSA-2021-2725 |
Advisories 30
- ALSA-2021:4356 Moderate: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:4356 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- RHSA-2021:4140 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 14, 2026
- RHSA-2021:2726 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 14, 2026
- RHSA-2021:2725 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Aug 14, 2026
- USN-5343-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-4979-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-4984-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-2940-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:3641-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3929-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3675-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3876-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3969-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3642-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3935-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1477-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3641-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14849-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3748-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3723-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:3876-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0063 Juniper Junos Space: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 8, 2025
- openSUSE-SU-2021:3675-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- ELSA-2021-2725 Important: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 21, 2021
- ELSA-2021-9363 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 16, 2021
- ELSA-2021-9362 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 16, 2021
- ELSA-2021-9351 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 12, 2021
- ELSA-2021-9349 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 12, 2021
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7
- https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14