In the Linux kernel, the following vulnerability has been resolved:
ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()
Syzkaller is able to provoke null-ptr-dereference in ocfs2_xa_remove():
[ 57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12 [ 57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Partial truncate while removing xattr overlay.upper. Leaking 1 clusters and removing the entry [ 57.321727] BUG: kernel NULL pointer dereference, address: 0000000000000004 [...] [ 57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [...] [ 57.331328] Call Trace: [ 57.331477] <TASK> [...] [ 57.333511] ? do_user_addr_fault+0x3e5/0x740 [ 57.333778] ? exc_page_fault+0x70/0x170 [ 57.334016] ? asm_exc_page_fault+0x2b/0x30 [ 57.334263] ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10 [ 57.334596] ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [ 57.334913] ocfs2_xa_remove_entry+0x23/0xc0 [ 57.335164] ocfs2_xa_set+0x704/0xcf0 [ 57.335381] ? _raw_spin_unlock+0x1a/0x40 [ 57.335620] ? ocfs2_inode_cache_unlock+0x16/0x20 [ 57.335915] ? trace_preempt_on+0x1e/0x70 [ 57.336153] ? start_this_handle+0x16c/0x500 [ 57.336410] ? preempt_count_sub+0x50/0x80 [ 57.336656] ? _raw_read_unlock+0x20/0x40 [ 57.336906] ? start_this_handle+0x16c/0x500 [ 57.337162] ocfs2_xattr_block_set+0xa6/0x1e0 [ 57.337424] __ocfs2_xattr_set_handle+0x1fd/0x5d0 [ 57.337706] ? ocfs2_start_trans+0x13d/0x290 [ 57.337971] ocfs2_xattr_set+0xb13/0xfb0 [ 57.338207] ? dput+0x46/0x1c0 [ 57.338393] ocfs2_xattr_trusted_set+0x28/0x30 [ 57.338665] ? ocfs2_xattr_trusted_set+0x28/0x30 [ 57.338948] __vfs_removexattr+0x92/0xc0 [ 57.339182] __vfs_removexattr_locked+0xd5/0x190 [ 57.339456] ? preempt_count_sub+0x50/0x80 [ 57.339705] vfs_removexattr+0x5f/0x100 [...]
Reproducer uses faultinject facility to fail ocfs2_xa_remove() -> ocfs2_xa_value_truncate() with -ENOMEM.
In this case the comment mentions that we can return 0 if ocfs2_xa_cleanup_value_truncate() is going to wipe the entry anyway. But the following 'rc' check is wrong and execution flow do 'ocfs2_xa_remove_entry(loc);' twice: * 1st: in ocfs2_xa_cleanup_value_truncate(); * 2nd: returning back to ocfs2_xa_remove() instead of going to 'out'.
Fix this by skipping the 2nd removal of the same entry and making syzkaller repro happy.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.1Upgrade linux | Dec 2, 2024 | Nov 19, 2024 |
| Oracle_linux | — | Upgrade kernel-uek | Feb 10, 2025 | Nov 19, 2024 |
| Ubuntu | — | Upgrade linux-image-fipsUpgrade linux-image-4.15.0-1141-oracleUpgrade linux-image-generic-hwe-16.04Upgrade linux-image-5.15.0-1033-nvidia-tegraUpgrade linux-image-generic-lpaeUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-oem-22.04aUpgrade linux-image-bluefieldUpgrade linux-image-5.15.0-134-genericUpgrade linux-image-5.15.0-133-genericUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-5.15.0-133-lowlatency-64kUpgrade linux-image-azure-fdeUpgrade linux-image-ibmUpgrade linux-image-4.15.0-1179-awsUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-generic-lts-xenialUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1028-raspiUpgrade linux-image-5.15.0-1021-nvidia-tegra-igxUpgrade linux-image-aws-lts-20.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.8.0-1028-gcpUpgrade linux-image-5.15.0-1075-gkeUpgrade linux-image-5.15.0-1080-awsUpgrade linux-image-6.8.0-1024-oracle-64kUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-4.4.0-267-genericUpgrade linux-image-5.4.0-1143-gcpUpgrade linux-image-genericUpgrade linux-image-5.15.0-1021-nvidia-tegra-igx-rtUpgrade linux-image-ibm-classicUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-oem-22.04bUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-gkeop-6.8Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-4.15.0-2080-gcp-fipsUpgrade linux-image-azure-fipsUpgrade linux-image-5.15.0-1033-nvidia-tegra-rtUpgrade linux-image-gkeopUpgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-raspi2Upgrade linux-image-virtual-hwe-16.04Upgrade linux-image-gcp-lts-18.04Upgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-5.4.0-208-lowlatencyUpgrade linux-image-azure-nvidiaUpgrade linux-image-gcpUpgrade linux-image-5.15.0-1081-azure-fdeUpgrade linux-image-oem-20.04dUpgrade linux-image-5.15.0-1074-ibmUpgrade linux-image-gcp-64k-lts-24.04Upgrade 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linux-image-nvidia-lowlatencyUpgrade linux-image-4.4.0-267-lowlatencyUpgrade linux-image-6.8.0-1026-nvidia-64kUpgrade linux-image-gcp-64kUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-5.4.0-1127-kvmUpgrade linux-image-5.15.0-1070-ibmUpgrade linux-image-virtual-hwe-18.04Upgrade linux-image-azureUpgrade linux-image-oem-22.04cUpgrade linux-image-nvidia-tegra-igxUpgrade linux-image-4.15.0-1187-azureUpgrade linux-image-5.15.0-1072-nvidiaUpgrade linux-image-4.15.0-2117-aws-fipsUpgrade linux-image-5.15.0-133-generic-lpaeUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-gkeop-5.15Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1026-nvidia-lowlatencyUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-6.8.0-1026-nvidia-lowlatency-64kUpgrade linux-image-oem-24.04Upgrade linux-image-oem-20.04Upgrade linux-image-nvidia-64kUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-6.8.0-1024-oracleUpgrade linux-image-5.4.0-1048-iotUpgrade linux-image-4.4.0-1112-fipsUpgrade linux-image-aws-lts-18.04Upgrade linux-image-oemUpgrade linux-image-azure-cvmUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-5.15.0-133-lowlatencyUpgrade linux-image-nvidia-6.8Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-5.15.0-1073-intel-iotgUpgrade linux-image-5.4.0-208-genericUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-6.8.0-1026-oemUpgrade linux-image-5.15.0-1044-xilinx-zynqmpUpgrade linux-image-intel-iotgUpgrade linux-image-4.15.0-1134-fipsUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-6.8.0-1024-ibmUpgrade linux-image-5.15.0-134-generic-lpaeUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-5.4.0-1142-awsUpgrade linux-image-5.4.0-1116-fipsUpgrade linux-image-raspiUpgrade linux-image-oracleUpgrade linux-image-5.15.0-1077-gcpUpgrade linux-image-4.15.0-2096-azure-fipsUpgrade linux-image-5.15.0-1072-nvidia-lowlatencyUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-lowlatency-hwe-16.04Upgrade linux-image-6.8.0-1023-gkeUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-5.4.0-1140-awsUpgrade linux-image-oem-22.04dUpgrade linux-image-5.15.0-133-generic-64kUpgrade linux-image-kvmUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1027-azure-fdeUpgrade linux-image-realtimeUpgrade linux-image-6.8.0-1010-gkeopUpgrade linux-image-6.8.0-1026-nvidiaUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-raspi-hwe-18.04Upgrade linux-image-5.4.0-1145-azureUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-aws-fipsUpgrade linux-image-5.15.0-1078-awsUpgrade linux-image-6.8.0-1027-azureUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-5.15.0-1060-gkeopUpgrade linux-image-aws-hweUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-oracle-lts-18.04Upgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-lowlatency-lts-xenialUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-5.4.0-1138-oracleUpgrade linux-image-5.15.0-1075-oracleUpgrade linux-image-aws-lts-24.04Upgrade linux-image-awsUpgrade linux-image-5.15.0-134-generic-64kUpgrade linux-image-6.8.0-1028-gcp-64kUpgrade linux-image-4.15.0-1162-kvmUpgrade linux-image-oem-20.04cUpgrade linux-image-6.8.0-58-genericUpgrade linux-image-virtual-lts-xenialUpgrade linux-image-oracle-64k | Feb 20, 2025 | Nov 19, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2025 | Nov 19, 2024 |
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