In the Linux kernel, the following vulnerability has been resolved:
erofs: fix inline data read failure for ztailpacking pclusters
Compressed folios for ztailpacking pclusters must be valid before adding these pclusters to I/O chains. Otherwise, z_erofs_decompress_pcluster() may assume they are already valid and then trigger a NULL pointer dereference.
It is somewhat hard to reproduce because the inline data is in the same block as the tail of the compressed indexes, which are usually read just before. However, it may still happen if a fatal signal arrives while read_mapping_folio() is running, as shown below:
erofs: (device dm-1): z_erofs_pcluster_begin: failed to get inline data -4 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
...
pc : z_erofs_decompress_queue+0x4c8/0xa14 lr : z_erofs_decompress_queue+0x160/0xa14 sp : ffffffc08b3eb3a0 x29: ffffffc08b3eb570 x28: ffffffc08b3eb418 x27: 0000000000001000 x26: ffffff8086ebdbb8 x25: ffffff8086ebdbb8 x24: 0000000000000001 x23: 0000000000000008 x22: 00000000fffffffb x21: dead000000000700 x20: 00000000000015e7 x19: ffffff808babb400 x18: ffffffc089edc098 x17: 00000000c006287d x16: 00000000c006287d x15: 0000000000000004 x14: ffffff80ba8f8000 x13: 0000000000000004 x12: 00000006589a77c9 x11: 0000000000000015 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : ffffffffffffffe0 x3 : 0000000000000020 x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: z_erofs_decompress_queue+0x4c8/0xa14 z_erofs_runqueue+0x908/0x97c z_erofs_read_folio+0x128/0x228 filemap_read_folio+0x68/0x128 filemap_get_pages+0x44c/0x8b4 filemap_read+0x12c/0x5b8 generic_file_read_iter+0x4c/0x15c do_iter_readv_writev+0x188/0x1e0 vfs_iter_read+0xac/0x1a4 backing_file_read_iter+0x170/0x34c ovl_read_iter+0xf0/0x140 vfs_read+0x28c/0x344 ksys_read+0x80/0xf0 __arm64_sys_read+0x24/0x34 invoke_syscall+0x60/0x114 el0_svc_common+0x88/0xe4 do_el0_svc+0x24/0x30 el0_svc+0x40/0xa8 el0t_64_sync_handler+0x70/0xbc el0t_64_sync+0x1bc/0x1c0
Fix this by reading the inline data before allocating and adding the pclusters to the I/O chains.
CVSS Details
- CVSS 3.1 Base Score: 7.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-gcp-fipsUpgrade linux-image-nvidiaUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-6.8.0-1059-nvidia-lowlatencyUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1061-aws-64kUpgrade linux-image-6.8.0-1064-gcp-fipsUpgrade linux-image-6.8.1-1056-realtimeUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-6.8.0-1061-raspiUpgrade linux-image-oracleUpgrade linux-image-generic-lpaeUpgrade linux-image-gkeop-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-oem-20.04bUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1033-xilinxUpgrade linux-image-aws-fipsUpgrade linux-image-gcp-6.8Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-2050-raspi-realtimeUpgrade linux-image-6.8.0-1064-gcpUpgrade linux-image-6.8.0-1030-nvidia-tegra-rtUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-6.8.0-1058-oracle-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-gkeopUpgrade linux-image-6.8.0-136-fipsUpgrade linux-image-6.8.0-1046-gkeopUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-oem-22.04Upgrade linux-image-azure-fdeUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-fipsUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-6.8.0-1059-nvidia-64kUpgrade linux-image-6.8.0-1064-gcp-64kUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-ibmUpgrade linux-image-azure-fde-6.8Upgrade linux-image-nvidia-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1061-awsUpgrade linux-image-lowlatency-6.8Upgrade linux-image-gke-64kUpgrade linux-image-6.8.0-136-lowlatencyUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-genericUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-6.8.0-136-lowlatency-64kUpgrade linux-image-6.8.0-1063-azure-fipsUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1063-azureUpgrade linux-image-6.8.0-1059-gke-64kUpgrade linux-image-6.8.0-1030-nvidia-tegraUpgrade linux-image-nvidia-64kUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-gke-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1061-aws-fipsUpgrade linux-image-raspi-6.8Upgrade linux-image-oem-22.04bUpgrade linux-image-awsUpgrade linux-image-oem-20.04Upgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-kvmUpgrade linux-image-gcp-64kUpgrade linux-image-azure-fips-6.8Upgrade linux-image-azure-fipsUpgrade linux-image-6.8.0-136-genericUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-oracle-6.8Upgrade linux-image-oem-22.04dUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-fips-6.8Upgrade linux-image-intel-iotgUpgrade linux-image-gkeUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-1059-nvidia-lowlatency-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-aws-fips-6.8Upgrade linux-image-azure-lts-24.04Upgrade linux-image-laptop-23.10Upgrade linux-image-generic-6.8Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gcpUpgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-1059-nvidiaUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-realtimeUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-oem-22.04cUpgrade linux-image-oem-20.04dUpgrade linux-image-azure-6.8Upgrade linux-image-xilinxUpgrade linux-image-oracle-64kUpgrade linux-image-virtual-6.8Upgrade linux-image-nvidia-tegraUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-generic-64k-6.8Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-realtime-6.8.1Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-oem-20.04cUpgrade linux-image-xilinx-6.8Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-6.8.0-1061-ibmUpgrade linux-image-6.8.0-1059-gkeUpgrade linux-image-ibm-classicUpgrade linux-image-azureUpgrade linux-image-6.8.0-1058-oracleUpgrade linux-image-gke-64k-6.8Upgrade linux-image-aws-64k | Jul 21, 2026 | Jul 20, 2026 |
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