In the Linux kernel, the following vulnerability has been resolved:
ocfs2: reserve space for inline xattr before attaching reflink tree
One of our customers reported a crash and a corrupted ocfs2 filesystem. The crash was due to the detection of corruption. Upon troubleshooting, the fsck -fn output showed the below corruption
[EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record, but fsck believes the largest valid value is 227. Clamp the next record value? n
The stat output from the debugfs.ocfs2 showed the following corruption where the "Next Free Rec:" had overshot the "Count:" in the root metadata block.
Inode: 33080590 Mode: 0640 Generation: 2619713622 (0x9c25a856) FS Generation: 904309833 (0x35e6ac49) CRC32: 00000000 ECC: 0000 Type: Regular Attr: 0x0 Flags: Valid Dynamic Features: (0x16) HasXattr InlineXattr Refcounted Extended Attributes Block: 0 Extended Attributes Inline Size: 256 User: 0 (root) Group: 0 (root) Size: 281320357888 Links: 1 Clusters: 141738 ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024 atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024 mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024 dtime: 0x0 -- Wed Dec 31 17:00:00 1969 Refcount Block: 2777346 Last Extblk: 2886943 Orphan Slot: 0 Sub Alloc Slot: 0 Sub Alloc Bit: 14 Tree Depth: 1 Count: 227 Next Free Rec: 230 ## Offset Clusters Block# 0 0 2310 2776351 1 2310 2139 2777375 2 4449 1221 2778399 3 5670 731 2779423 4 6401 566 2780447 ....... .... ....... ....... .... .......
The issue was in the reflink workfow while reserving space for inline xattr. The problematic function is ocfs2_reflink_xattr_inline(). By the time this function is called the reflink tree is already recreated at the destination inode from the source inode. At this point, this function reserves space for inline xattrs at the destination inode without even checking if there is space at the root metadata block. It simply reduces the l_count from 243 to 227 thereby making space of 256 bytes for inline xattr whereas the inode already has extents beyond this index (in this case up to 230), thereby causing corruption.
The fix for this is to reserve space for inline metadata at the destination inode before the reflink tree gets recreated. The customer has verified the fix.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.1Upgrade linux | Nov 11, 2024 | Oct 21, 2024 |
| Oracle_linux | — | Upgrade kernel-uek | Nov 21, 2024 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-oem-osp1Upgrade linux-image-gkeop-5.15Upgrade linux-image-virtualUpgrade linux-image-6.8.0-1024-oemUpgrade linux-image-generic-hwe-18.04Upgrade linux-image-4.15.0-1190-azureUpgrade linux-image-5.15.0-1071-intel-iotgUpgrade linux-image-6.8.0-57-genericUpgrade linux-image-6.8.0-1020-oracle-64kUpgrade linux-image-5.4.0-1127-kvmUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-4.15.0-1175-gcpUpgrade linux-image-4.15.0-239-lowlatencyUpgrade linux-image-azure-4.15Upgrade linux-image-5.4.0-1145-azureUpgrade linux-image-5.4.0-1116-fipsUpgrade linux-image-oem-20.04dUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.8.0-1022-nvidia-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-5.15.0-1068-nvidia-lowlatencyUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-4.4.0-1115-fipsUpgrade linux-image-4.4.0-1146-kvmUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-oemUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-1024-gcp-64kUpgrade linux-image-generic-hwe-16.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-5.15.0-1066-raspiUpgrade linux-image-6.8.0-1022-nvidia-lowlatencyUpgrade linux-image-4.15.0-1144-oracleUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-4.15.0-239-genericUpgrade linux-image-5.15.0-1072-gcpUpgrade linux-image-snapdragon-hwe-18.04Upgrade linux-image-generic-lpaeUpgrade linux-image-bluefieldUpgrade linux-image-6.8.0-1019-raspiUpgrade linux-image-oem-20.04Upgrade linux-image-oem-22.04bUpgrade linux-image-intel-iotgUpgrade linux-image-oracleUpgrade linux-image-oem-24.04aUpgrade linux-image-6.8.0-54-lowlatencyUpgrade linux-image-gkeop-6.8Upgrade linux-image-raspi-hwe-18.04Upgrade linux-image-azure-lts-18.04Upgrade linux-image-azure-lts-20.04Upgrade linux-image-gcpUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-intelUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-realtimeUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-oem-24.04Upgrade linux-image-oem-24.04bUpgrade linux-image-virtual-hwe-18.04Upgrade linux-image-5.15.0-1056-gkeopUpgrade linux-image-aws-fips-4.15Upgrade linux-image-gkeUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-fipsUpgrade linux-image-5.4.0-1048-iotUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-kvmUpgrade linux-image-6.8.0-1006-gkeopUpgrade linux-image-virtual-lts-xenialUpgrade linux-image-raspi2Upgrade linux-image-6.8.0-57-generic-64kUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-gcp-lts-18.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-azure-cvmUpgrade linux-image-raspi-nolpaeUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-aws-lts-18.04Upgrade linux-image-gcp-lts-20.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracle-4.15Upgrade linux-image-oracle-64kUpgrade linux-image-gcp-4.15Upgrade linux-image-5.15.0-1066-ibmUpgrade linux-image-4.15.0-1182-awsUpgrade linux-image-lowlatency-hwe-16.04Upgrade linux-image-virtual-hwe-16.04Upgrade linux-image-generic-lts-xenialUpgrade linux-image-lowlatency-lts-xenialUpgrade linux-image-5.15.0-1070-gkeUpgrade linux-image-awsUpgrade linux-image-6.8.0-1022-nvidiaUpgrade linux-image-5.15.0-127-lowlatencyUpgrade linux-image-gkeopUpgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-raspiUpgrade linux-image-ibm-lts-20.04Upgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-5.15.0-1068-nvidiaUpgrade linux-image-nvidiaUpgrade linux-image-azure-lts-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-4.15.0-1165-kvmUpgrade linux-image-aws-lts-22.04Upgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-5.15.0-127-generic-64kUpgrade linux-image-aws-lts-20.04Upgrade linux-image-5.4.0-1140-awsUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-oem-22.04dUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-4.15.0-2083-gcp-fipsUpgrade linux-image-5.4.0-1099-bluefieldUpgrade linux-image-6.8.0-1022-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-54-genericUpgrade linux-image-4.15.0-1137-fipsUpgrade linux-image-oem-20.04cUpgrade linux-image-6.8.0-1020-oracleUpgrade linux-image-6.8.0-1022-ibmUpgrade linux-image-5.4.0-1086-ibmUpgrade linux-image-generic-64kUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-5.15.0-1039-xilinx-zynqmpUpgrade linux-image-aws-fipsUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-azure-fdeUpgrade linux-image-ibmUpgrade linux-image-5.4.0-208-lowlatencyUpgrade linux-image-oem-22.04Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-6.8.0-1025-azureUpgrade linux-image-nvidia-6.8Upgrade linux-image-aws-hweUpgrade linux-image-6.8.0-54-lowlatency-64kUpgrade linux-image-6.8.0-1023-awsUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-6.8.0-1019-gkeUpgrade linux-image-5.4.0-208-generic-lpaeUpgrade linux-image-5.4.0-208-genericUpgrade linux-image-5.15.0-1073-awsUpgrade linux-image-5.15.0-1070-kvmUpgrade linux-image-4.4.0-1145-awsUpgrade linux-image-4.15.0-2099-azure-fipsUpgrade linux-image-5.15.0-127-lowlatency-64kUpgrade linux-image-6.8.0-1024-gcpUpgrade linux-image-aws-4.15Upgrade linux-image-6.8.0-1025-azure-fdeUpgrade linux-image-5.15.0-127-generic-lpaeUpgrade linux-image-4.4.0-270-genericUpgrade linux-image-azureUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-oem-22.04cUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-20.04bUpgrade linux-image-6.8.0-54-generic-64kUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-ibm-classicUpgrade linux-image-5.15.0-1071-oracleUpgrade linux-image-gke-5.15Upgrade linux-image-4.4.0-270-lowlatencyUpgrade linux-image-aws-lts-24.04Upgrade linux-image-oem-22.04aUpgrade linux-image-4.4.0-1183-awsUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-realtime-hwe-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-5.15.0-127-genericUpgrade linux-image-5.4.0-1129-raspiUpgrade linux-image-5.15.0-1078-azureUpgrade linux-image-lowlatency-64kUpgrade linux-image-oracle-lts-18.04Upgrade linux-image-azure-lts-22.04Upgrade linux-image-genericUpgrade linux-image-azure-nvidiaUpgrade linux-image-gcp-fips-4.15Upgrade linux-image-virtual-hwe-20.04Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-azure-fipsUpgrade linux-image-5.4.0-1143-gcpUpgrade linux-image-5.4.0-1142-awsUpgrade linux-image-5.4.0-1058-xilinx-zynqmpUpgrade linux-image-nvidia-64kUpgrade linux-image-4.15.0-2120-aws-fipsUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-5.4.0-1138-oracle | Dec 18, 2024 | Oct 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 10, 2025 | Oct 21, 2024 |
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