CVE-2026-45985: ext4: don't set EXT4_GET_BLOCKS_CONVERT when splitting before submitting I/O

Published May 27, 2026
·
Updated

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

ext4: don't set EXT4GETBLOCKSCONVERT when splitting before submitting I/O

When allocating blocks during within-EOF DIO and writeback with dioreadnolock enabled, EXT4GETBLOCKSPREIO was set to split an existing large unwritten extent. However, EXT4GETBLOCKSCONVERT was set when calling ext4splitconvertextents(), which may potentially result in stale data issues.

Assume we have an unwritten extent, and then DIO writes the second half.

[UUUUUUUUUUUUUUUU] on-disk extent U: unwritten extent [UUUUUUUUUUUUUUUU] extent status tree |<- ->| ----> dio write this range

First, ext4iomapalloc() call ext4mapblocks() with EXT4GETBLOCKSPREIO, EXT4GETBLOCKSUNWRITEXT and EXT4GETBLOCKSCREATE flags set. ext4mapblocks() find this extent and call ext4splitconvertextents() with EXT4GETBLOCKSCONVERT and the above flags set.

Then, ext4splitconvertextents() calls ext4splitextent() with EXT4EXTMAYZEROOUT, EXT4EXTMARKUNWRIT2 and EXT4EXTDATAVALID2 flags set, and it calls ext4splitextentat() to split the second half with EXT4EXTDATAVALID2, EXT4EXTMARKUNWRIT1, EXT4EXTMAYZEROOUT and EXT4EXTMARKUNWRIT2 flags set. However, ext4splitextentat() failed to insert extent since a temporary lack -ENOSPC. It zeroes out the first half but convert the entire on-disk extent to written since the EXT4EXTDATAVALID2 flag set, but left the second half as unwritten in the extent status tree.

[0000000000SSSSSS] data S: stale data, 0: zeroed [WWWWWWWWWWWWWWWW] on-disk extent W: written extent [WWWWWWWWWWUUUUUU] extent status tree

Finally, if the DIO failed to write data to the disk, the stale data in the second half will be exposed once the cached extent entry is gone.

Fix this issue by not passing EXT4GETBLOCKSCONVERT when splitting an unwritten extent before submitting I/O, and make ext4splitconvertextents() to zero out the entire extent range to zero for this case, and also mark the extent in the extent status tree for consistency.

Affected Software

260 affected componentsFixes available
Linux Linux kernel (ext4)
Linux Linux kernel>=3.15<5.10.253
Linux Linux kernel>=5.11<5.15.203
Linux Linux kernel>=5.16<6.6.130
Linux Linux kernel>=6.7<6.12.77
Linux Linux kernel>=6.13<6.18.17
Linux Linux kernel>=6.19<6.19.4
debian/linux*
debian/linux<6.12.85-1
6.12.85-1
debian/linux<6.19.6-1
6.19.6-1
linux/kernel>=3.15.0<5.10.253
5.10.253
linux/kernel>=5.11.0<5.15.203
5.15.203
linux/kernel>=5.16.0<6.1.191
6.1.191
linux/kernel>=6.2.0<6.6.130
6.6.130
linux/kernel>=6.7.0<6.12.77
6.12.77
linux/kernel>=6.13.0<6.18.17
6.18.17
linux/kernel>=6.19.0<6.19.4
6.19.4
debian/linux<=6.1.176-1, <=6.1.190-1
6.12.107-16.12.116-17.2.15-17.3.3-1
ubuntu/linux-aws*
ubuntu/linux-azure*
ubuntu/linux-lts-xenial*
ubuntu/linux*
ubuntu/linux-aws*
ubuntu/linux-aws-hwe*
ubuntu/linux-azure*
ubuntu/linux-gcp*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-kvm*
ubuntu/linux-oracle*
ubuntu/linux-fips*
ubuntu/linux-fips*
ubuntu/linux*
ubuntu/linux-aws*
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-aws-5.4*
ubuntu/linux-azure*
ubuntu/linux-azure-4.15*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-5.4*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-4.15*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-5.4*
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-5.4*
ubuntu/linux-hwe-edge*
ubuntu/linux-ibm-5.4*
ubuntu/linux-kvm*
ubuntu/linux-oem*
ubuntu/linux-oracle*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-oracle-5.4*
ubuntu/linux-raspi-5.4*
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux*
ubuntu/linux-aws*
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.15<5.15.0-1112.119~20.04.1
5.15.0-1112.119~20.04.1
ubuntu/linux-aws-5.8*
ubuntu/linux-azure*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.15<5.15.0-1117.126~20.04.1
5.15.0-1117.126~20.04.1
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-azure-fde-5.15<5.15.0-1117.126~20.04.2
5.15.0-1117.126~20.04.2
ubuntu/linux-bluefield*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.15<5.15.0-1112.122~20.04.1
5.15.0-1112.122~20.04.1
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-gkeop*
ubuntu/linux-gkeop-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.15<5.15.0-186.196~20.04.1
5.15.0-186.196~20.04.1
ubuntu/linux-hwe-5.8*
ubuntu/linux-ibm*
ubuntu/linux-ibm-5.15<5.15.0-1106.110~20.04.1
5.15.0-1106.110~20.04.1
ubuntu/linux-intel-5.13*
ubuntu/linux-intel-iotg-5.15<5.15.0-1107.113~20.04.1
5.15.0-1107.113~20.04.1
ubuntu/linux-iot*
ubuntu/linux-kvm*
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-184.194~20.04.1
5.15.0-184.194~20.04.1
ubuntu/linux-nvidia-tegra-5.15<5.15.0-1064.66~20.04.1
5.15.0-1064.66~20.04.1
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle*
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.15<5.15.0-1109.115~20.04.1
5.15.0-1109.115~20.04.1
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.15<5.15.0-1106.110~20.04.1
5.15.0-1106.110~20.04.1
ubuntu/linux-riscv-5.8*
ubuntu/linux-xilinx-zynqmp*
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-186.196
5.15.0-186.196
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1112.119
5.15.0-1112.119
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-aws-6.8<6.8.0-1061.64~22.04.1
6.8.0-1061.64~22.04.1
ubuntu/linux-azure<5.15.0-1117.126
5.15.0-1117.126
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-6.8<6.8.0-1063.71~22.04.1
6.8.0-1063.71~22.04.1
ubuntu/linux-azure-fde<5.15.0-1117.126
5.15.0-1117.126
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-azure-fde-6.8<6.8.0-1062.69~22.04.1
6.8.0-1062.69~22.04.1
ubuntu/linux-gcp<5.15.0-1112.122
5.15.0-1112.122
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gcp-6.8<6.8.0-1064.72~22.04.1
6.8.0-1064.72~22.04.1
ubuntu/linux-gke<5.15.0-1108.114
5.15.0-1108.114
ubuntu/linux-gkeop<5.15.0-1095.103
5.15.0-1095.103
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-hwe-6.8<6.8.0-136.136~22.04.1
6.8.0-136.136~22.04.1
ubuntu/linux-ibm<5.15.0-1106.110
5.15.0-1106.110
ubuntu/linux-ibm-6.8<6.8.0-1061.62~22.04.1
6.8.0-1061.62~22.04.1
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1107.113
5.15.0-1107.113
ubuntu/linux-kvm<5.15.0-1104.109
5.15.0-1104.109
ubuntu/linux-lowlatency<5.15.0-184.194
5.15.0-184.194
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-lowlatency-hwe-6.8<6.8.0-136.136.2~22.04.1
6.8.0-136.136.2~22.04.1
ubuntu/linux-nvidia<5.15.0-1107.108
5.15.0-1107.108
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5*
ubuntu/linux-nvidia-6.8<6.8.0-1059.62~22.04.1
6.8.0-1059.62~22.04.1
ubuntu/linux-nvidia-tegra<5.15.0-1064.66
5.15.0-1064.66
ubuntu/linux-nvidia-tegra-igx<5.15.0-1053.53
5.15.0-1053.53
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle<5.15.0-1109.115
5.15.0-1109.115
ubuntu/linux-oracle-6.5*
ubuntu/linux-oracle-6.8<6.8.0-1058.61~22.04.1
6.8.0-1058.61~22.04.1
ubuntu/linux-raspi<5.15.0-1106.109
5.15.0-1106.109
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-riscv-6.8<6.8.0-136.136~22.04.3
6.8.0-136.136~22.04.3
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-xilinx-zynqmp<5.15.0-1075.79
5.15.0-1075.79
ubuntu/linux-bluefield<5.15.0-1096.98
5.15.0-1096.98
ubuntu/linux-intel-iot-realtime<5.15.0-1104.106
5.15.0-1104.106
ubuntu/linux-realtime<5.15.0-1111.120
5.15.0-1111.120
ubuntu/linux-realtime-6.8<6.8.1-1056.57~22.04.2
6.8.1-1056.57~22.04.2
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips<5.15.0-1112.119+fips1
5.15.0-1112.119+fips1
ubuntu/linux-azure-fips<5.15.0-1117.126+fips1
5.15.0-1117.126+fips1
ubuntu/linux-fips<5.15.0-186.196+fips1
5.15.0-186.196+fips1
ubuntu/linux-gcp-fips<5.15.0-1112.122+fips1
5.15.0-1112.122+fips1
ubuntu/linux<6.8.0-136.136
6.8.0-136.136
ubuntu/linux-aws<6.8.0-1061.64
6.8.0-1061.64
ubuntu/linux-aws-6.14*
ubuntu/linux-aws-6.17*
ubuntu/linux-azure<6.8.0-1063.71
6.8.0-1063.71
ubuntu/linux-azure-6.11*
ubuntu/linux-azure-6.14*
ubuntu/linux-azure-6.17*
ubuntu/linux-azure-fde<6.8.0-1062.69
6.8.0-1062.69
ubuntu/linux-azure-fde-6.14*
ubuntu/linux-azure-nvidia*
ubuntu/linux-azure-nvidia-6.14*
ubuntu/linux-gcp<6.8.0-1064.72
6.8.0-1064.72
ubuntu/linux-gcp-6.11*
ubuntu/linux-gcp-6.14*
ubuntu/linux-gke<6.8.0-1059.67
6.8.0-1059.67
ubuntu/linux-gkeop<6.8.0-1046.50
6.8.0-1046.50
ubuntu/linux-hwe-6.11*
ubuntu/linux-hwe-6.14*
ubuntu/linux-hwe-6.17*
ubuntu/linux-ibm<6.8.0-1061.62
6.8.0-1061.62
ubuntu/linux-lowlatency<6.8.0-136.136.2
6.8.0-136.136.2
ubuntu/linux-lowlatency-hwe-6.11*
ubuntu/linux-nvidia<6.8.0-1059.62
6.8.0-1059.62
ubuntu/linux-nvidia-6.11*
ubuntu/linux-nvidia-6.17*
ubuntu/linux-nvidia-lowlatency<6.8.0-1059.62.1
6.8.0-1059.62.1
ubuntu/linux-nvidia-tegra<6.8.0-1030.31
6.8.0-1030.31
ubuntu/linux-oem-6.11*
ubuntu/linux-oem-6.14*
ubuntu/linux-oem-6.17*
ubuntu/linux-oem-6.8*
ubuntu/linux-oracle<6.8.0-1058.61
6.8.0-1058.61
ubuntu/linux-oracle-6.14*
ubuntu/linux-oracle-6.17*
ubuntu/linux-raspi<6.8.0-1061.65
6.8.0-1061.65
ubuntu/linux-raspi-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-6.14*
ubuntu/linux-riscv-6.17*
ubuntu/linux-vmware<6.8.0-1008.8
6.8.0-1008.8
ubuntu/linux-xilinx<6.8.0-1033.34
6.8.0-1033.34
ubuntu/linux-bluefield<6.8.0-1028.33
6.8.0-1028.33
ubuntu/linux-raspi-realtime<6.8.0-2050.52
6.8.0-2050.52
ubuntu/linux-realtime<6.8.1-1056.57
6.8.1-1056.57
ubuntu/linux-realtime-6.14*
ubuntu/linux-realtime-6.17*
ubuntu/linux-aws-fips<6.8.0-1061.64+fips1
6.8.0-1061.64+fips1
ubuntu/linux-azure-fips<6.8.0-1063.71+fips2
6.8.0-1063.71+fips2
ubuntu/linux-fips<6.8.0-136.136+fips2
6.8.0-136.136+fips2
ubuntu/linux-gcp-fips<6.8.0-1064.72+fips1
6.8.0-1064.72+fips1
ubuntu/linux*
ubuntu/linux-aws*
ubuntu/linux-azure*
ubuntu/linux-azure-fde*
ubuntu/linux-gcp*
ubuntu/linux-oracle*
ubuntu/linux-raspi*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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    Fixed in 6.12.85-1
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    Fixed in 6.19.6-1
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    Fixed in 5.10.253
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    Fixed in 5.15.203
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    Fixed in 6.1.191
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    Fixed in 6.6.130
  7. Upgrade

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    Fixed in 6.12.77
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    Fixed in 6.18.17
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    Fixed in 6.19.4
  10. Upgrade

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    Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.3-1
  11. Upgrade

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    Fixed in 5.15.0-1112.119~20.04.1
  12. Upgrade

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    Fixed in 5.15.0-1117.126~20.04.1
  13. Upgrade

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    Fixed in 5.15.0-1117.126~20.04.2
  14. Upgrade

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    Fixed in 5.15.0-1112.122~20.04.1
  15. Upgrade

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    Fixed in 5.15.0-186.196~20.04.1
  16. Upgrade

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    Fixed in 5.15.0-1106.110~20.04.1
  17. Upgrade

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    Fixed in 5.15.0-1107.113~20.04.1
  18. Upgrade

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    Fixed in 5.15.0-184.194~20.04.1
  19. Upgrade

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    Fixed in 5.15.0-1064.66~20.04.1
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    Fixed in 5.15.0-1109.115~20.04.1
  21. Upgrade

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    Fixed in 5.15.0-1106.110~20.04.1
  22. Upgrade

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    Fixed in 5.15.0-186.196
  23. Upgrade

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    Fixed in 5.15.0-1112.119
  24. Upgrade

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    Fixed in 6.8.0-1061.64~22.04.1
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    Fixed in 5.15.0-1117.126
  26. Upgrade

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    Fixed in 6.8.0-1063.71~22.04.1
  27. Upgrade

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    Fixed in 5.15.0-1117.126
  28. Upgrade

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    Fixed in 6.8.0-1062.69~22.04.1
  29. Upgrade

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    Fixed in 5.15.0-1112.122
  30. Upgrade

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    Fixed in 6.8.0-1064.72~22.04.1
  31. Upgrade

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    Fixed in 5.15.0-1108.114
  32. Upgrade

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    Fixed in 5.15.0-1095.103
  33. Upgrade

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    Fixed in 6.8.0-136.136~22.04.1
  34. Upgrade

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    Fixed in 5.15.0-1106.110
  35. Upgrade

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    Fixed in 6.8.0-1061.62~22.04.1
  36. Upgrade

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    Fixed in 5.15.0-1107.113
  37. Upgrade

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    Fixed in 5.15.0-1104.109
  38. Upgrade

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    Fixed in 5.15.0-184.194
  39. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-136.136.2~22.04.1
  40. Upgrade

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    Fixed in 5.15.0-1107.108
  41. Upgrade

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    Fixed in 6.8.0-1059.62~22.04.1
  42. Upgrade

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    Fixed in 5.15.0-1064.66
  43. Upgrade

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    Fixed in 5.15.0-1053.53
  44. Upgrade

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    Fixed in 5.15.0-1109.115
  45. Upgrade

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    Fixed in 6.8.0-1058.61~22.04.1
  46. Upgrade

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    Fixed in 5.15.0-1106.109
  47. Upgrade

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    Fixed in 6.8.0-136.136~22.04.3
  48. Upgrade

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    Fixed in 5.15.0-1075.79
  49. Upgrade

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    Fixed in 5.15.0-1096.98
  50. Upgrade

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    Fixed in 5.15.0-1104.106
  51. Upgrade

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    Fixed in 5.15.0-1111.120
  52. Upgrade

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    Fixed in 6.8.1-1056.57~22.04.2
  53. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1112.119+fips1
  54. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1117.126+fips1
  55. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-186.196+fips1
  56. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1112.122+fips1
  57. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 6.8.0-136.136
  58. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 6.8.0-1061.64
  59. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 6.8.0-1063.71
  60. Upgrade

    Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.

    Fixed in 6.8.0-1062.69
  61. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 6.8.0-1064.72
  62. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 6.8.0-1059.67
  63. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 6.8.0-1046.50
  64. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 6.8.0-1061.62
  65. Upgrade

    Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.

    Fixed in 6.8.0-136.136.2
  66. Upgrade

    Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.

    Fixed in 6.8.0-1059.62
  67. Upgrade

    Upgrade ubuntu/linux-nvidia-lowlatency to a version that resolves this vulnerability.

    Fixed in 6.8.0-1059.62.1
  68. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.

    Fixed in 6.8.0-1030.31
  69. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 6.8.0-1058.61
  70. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 6.8.0-1061.65
  71. Upgrade

    Upgrade ubuntu/linux-vmware to a version that resolves this vulnerability.

    Fixed in 6.8.0-1008.8
  72. Upgrade

    Upgrade ubuntu/linux-xilinx to a version that resolves this vulnerability.

    Fixed in 6.8.0-1033.34
  73. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 6.8.0-1028.33
  74. Upgrade

    Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.

    Fixed in 6.8.0-2050.52
  75. Upgrade

    Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.

    Fixed in 6.8.1-1056.57
  76. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-1061.64+fips1
  77. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-1063.71+fips2
  78. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-136.136+fips2
  79. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-1064.72+fips1
  80. Compensating control

    In ext4, do not pass EXT4_GET_BLOCKS_CONVERT when splitting an unwritten extent before submitting I/O; for this case, zero out the entire extent range and mark the extent in the extent status tree for consistency.

Event History

May 27, 2026
CVE Published
via MITRE·12:18 PM
Data Sourced
via MITRE·12:18 PM
Description
Data Sourced
via OSV·12:18 PM
DescriptionAffected Software
Data Sourced
via NVD·02:17 PM
RemedyDescriptionSeverityAffected Software
Nov 12, 2026
Data Sourced
via OSV·05:25 PM
Severity

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2026-45985?

The severity of CVE-2026-45985 is rated as medium with a CVSS score of 5.5.

2

What type of vulnerability is CVE-2026-45985?

CVE-2026-45985 is a vulnerability related to the ext4 filesystem in the Linux kernel.

3

How do I fix CVE-2026-45985?

To fix CVE-2026-45985, ensure that the Linux kernel is updated to a version that includes the patch for this vulnerability.

4

Is CVE-2026-45985 exploitable?

CVE-2026-45985 can be exploited under specific conditions related to block allocation during DIO operations.

5

What impact does CVE-2026-45985 have on system security?

CVE-2026-45985 could lead to potential data corruption during I/O operations in the ext4 filesystem.

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Contact

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