Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix memory leak in ext4_fill_super
Buffer head references must be released before calling kill_bdev();
otherwise the buffer head (and its page referenced by b_data) will not
be freed by kill_bdev, and subsequently that bh will be leaked.
If blocksizes differ, sb_set_blocksize() will kill current buffers and
page cache by using kill_bdev(). And then super block will be reread
again but using correct blocksize this time. sb_set_blocksize() didn't
fully free superblock page and buffer head, and being busy, they were
not freed and instead leaked.
This can easily be reproduced by calling an infinite loop of:
systemctl start <ext4_on_lvm>.mount, and
systemctl stop <ext4_on_lvm>.mount
... since systemd creates a cgroup for each slice which it mounts, and
the bh leak get amplified by a dying memory cgroup that also never
gets freed, and memory consumption is much more easily noticed.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 2.6.19 | 5.10.43 |
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 | 5.10.46-1 | — |
| Debian 13 | linux | 5.10.46-1 | — |
| Debian 12 | linux | 5.10.46-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +22 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-214.234 | USN-7461-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1144.154 | USN-7462-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1149.156 | USN-7461-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1103.110 | USN-7461-1 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1147.156 | USN-7461-1 |
| Ubuntu 20.04 LTS | linux-gke +27 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1090.95 | USN-7461-1 |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1049.52 | USN-7462-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1131.140 | USN-7461-1 |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1142.152 | USN-7461-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1129.142 | USN-7539-1 |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1062.66 | USN-7461-3 |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 9 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 | 5.4.0-1144.155+fips1 | USN-7462-2 |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1149.157+fips1 | USN-7461-2 |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1118.128 | USN-7461-2 |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1147.156+fips1 | USN-7461-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2117.123 | USN-7428-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2096.102 | USN-7428-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1134.145 | USN-7428-2 |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2080.86 | USN-7428-2 |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1112.119 | USN-7429-2 |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-236.248 | USN-7428-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1179.192 | USN-7428-1 |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1144.154~18.04.1 | USN-7462-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1187.202 | USN-7428-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1149.156~18.04.1 | USN-7461-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1172.189 | USN-7428-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1147.156~18.04.1 | USN-7462-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-214.234~18.04.1 | USN-7461-1 |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1090.95~18.04.1 | USN-7463-1 |
| Ubuntu Pro 18.04 LTS | linux-kvm | 4.15.0-1162.167 | USN-7428-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle | 4.15.0-1141.152 | USN-7428-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1142.152~18.04.1 | USN-7461-1 |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1129.142~18.04.1 | USN-7540-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-267.301 | USN-7429-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1180.195 | USN-7429-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1179.192~16.04.1 | USN-7428-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1187.202~16.04.1 | USN-7428-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1172.189~16.04.1 | USN-7428-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-236.248~16.04.1 | USN-7428-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1143.154 | USN-7429-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1141.152~16.04.1 | USN-7428-1 |
| Ubuntu Pro 14.04 LTS | linux | 3.13.0-205.256 | USN-7415-1 |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1142.148 | USN-7429-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1187.202~14.04.1 | USN-7428-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-267.301~14.04.1 | USN-7429-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-150300.59.158.1 | SUSE-SU-2024:1489-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-150300.59.158.1.150300.18.92.5 | SUSE-SU-2024:1489-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-150200.24.188.1.150200.9.95.3 | SUSE-SU-2024:1454-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.188.1 | SUSE-SU-2024:1454-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.182.1 | SUSE-SU-2024:1643-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.216.1 | SUSE-SU-2024:1870-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP3 | kernel-default-base | 5.3.18-150300.59.158.1.150300.18.92.5 | SUSE-SU-2024:1489-1 |
| SLES for SAP 15 SP3 | kernel-docs +5 | 5.3.18-150300.59.158.1 | SUSE-SU-2024:1489-1 |
| SLES for SAP 15 SP2 | kernel-default-base | 5.3.18-150200.24.188.1.150200.9.95.3 | SUSE-SU-2024:1454-1 |
| SLES for SAP 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.188.1 | SUSE-SU-2024:1454-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.182.1 | SUSE-SU-2024:1643-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.216.1 | SUSE-SU-2024:1870-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.182.1 | SUSE-SU-2024:1646-1 |
| SLE Micro 5.2 | kernel-default | 5.3.18-150300.59.158.1 | SUSE-SU-2024:1489-1 |
| SLE Micro 5.2 | kernel-default-base | 5.3.18-150300.59.158.1.150300.18.92.5 | SUSE-SU-2024:1489-1 |
| SLE Micro 5.2 | kernel-rt +1 | 5.3.18-150300.166.1 | SUSE-SU-2024:1465-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-150300.59.158.1 | SUSE-SU-2024:1489-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-150300.59.158.1.150300.18.92.5 | SUSE-SU-2024:1489-1 |
| SLE Micro 5.1 | kernel-rt +1 | 5.3.18-150300.166.1 | SUSE-SU-2024:1465-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-150300.59.158.1 | SUSE-SU-2024:1489-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_43 | 1-150300.7.3.5 | SUSE-SU-2024:1489-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-150200.24.188.1 | SUSE-SU-2024:1454-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_47 | 1-150200.5.3.3 | SUSE-SU-2024:1454-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.216.1 | SUSE-SU-2024:1870-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_56 | 1-8.3.1 | SUSE-SU-2024:1870-1 |
| SLE HPC 15 SP3 | kernel-64kb +6 | 5.3.18-150300.59.158.1 | SUSE-SU-2024:1489-1 |
| SLE HPC 15 SP3 | kernel-default-base | 5.3.18-150300.59.158.1.150300.18.92.5 | SUSE-SU-2024:1489-1 |
| SLE HPC 15 SP2 | kernel-default-base | 5.3.18-150200.24.188.1.150200.9.95.3 | SUSE-SU-2024:1454-1 |
| SLE HPC 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.188.1 | SUSE-SU-2024:1454-1 |
| SUSE Enterprise Storage 7.1 | kernel-64kb +6 | 5.3.18-150300.59.158.1 | SUSE-SU-2024:1489-1 |
| SUSE Enterprise Storage 7.1 | kernel-default-base | 5.3.18-150300.59.158.1.150300.18.92.5 | SUSE-SU-2024:1489-1 |
Advisories 20
- USN-7539-1 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7540-1 linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7461-1 linux, linux-azure, linux-azure-5.4, linux-bluefield, linux-gcp, linux-hwe-5.4, linux-ibm, linux-kvm, linux-oracle, linux-oracle-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7461-3 linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7462-2 linux-aws-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7428-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7429-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7463-1 linux-ibm-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7462-1 linux-aws, linux-aws-5.4, linux-gcp-5.4, linux-iot vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7461-2 linux-azure-fips, linux-fips, linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7428-2 linux-fips, linux-aws-fips, linux-azure-fips, linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7429-2 linux-fips vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7415-1 linux vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- WID-SEC-2024-0652 Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Aug 13, 2026
- SUSE-SU-2024:1489-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1870-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1454-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1646-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1643-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1465-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026