In the Linux kernel, the following vulnerability has been resolved:
ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0
When walking through an inode extents, the ext4_ext_binsearch_idx() function assumes that the extent header has been previously validated. However, there are no checks that verify that the number of entries (eh->eh_entries) is non-zero when depth is > 0. And this will lead to problems because the EXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:
[ 135.245946] ------------[ cut here ]------------ [ 135.247579] kernel BUG at fs/ext4/extents.c:2258! [ 135.249045] invalid opcode: 0000 [#1] PREEMPT SMP [ 135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4 [ 135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014 [ 135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0 [ 135.256475] Code: [ 135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246 [ 135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023 [ 135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c [ 135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c [ 135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024 [ 135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000 [ 135.272394] FS: 00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 [ 135.274510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0 [ 135.277952] Call Trace: [ 135.278635] <TASK> [ 135.279247] ? preempt_count_add+0x6d/0xa0 [ 135.280358] ? percpu_counter_add_batch+0x55/0xb0 [ 135.281612] ? _raw_read_unlock+0x18/0x30 [ 135.282704] ext4_map_blocks+0x294/0x5a0 [ 135.283745] ? xa_load+0x6f/0xa0 [ 135.284562] ext4_mpage_readpages+0x3d6/0x770 [ 135.285646] read_pages+0x67/0x1d0 [ 135.286492] ? folio_add_lru+0x51/0x80 [ 135.287441] page_cache_ra_unbounded+0x124/0x170 [ 135.288510] filemap_get_pages+0x23d/0x5a0 [ 135.289457] ? path_openat+0xa72/0xdd0 [ 135.290332] filemap_read+0xbf/0x300 [ 135.291158] ? _raw_spin_lock_irqsave+0x17/0x40 [ 135.292192] new_sync_read+0x103/0x170 [ 135.293014] vfs_read+0x15d/0x180 [ 135.293745] ksys_read+0xa1/0xe0 [ 135.294461] do_syscall_64+0x3c/0x80 [ 135.295284] entry_SYSCALL_64_after_hwframe+0x46/0xb0
This patch simply adds an extra check in __ext4_ext_check(), verifying that eh_entries is not 0 when eh_depth is > 0.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade perfUpgrade perf-debuginfoUpgrade kernel-livepatch-5.15.73-48.135Upgrade python-perfUpgrade bpftoolUpgrade bpftool-debuginfoUpgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-headersUpgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-livepatch-5.10.147-133.644Upgrade kernel-tools-develUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel | Aug 2, 2024 | Apr 28, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | Apr 28, 2024 |
| Dell Powerstore Dsa2024398 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Sep 17, 2024 |
| Dell Powerstore Dsa2024408 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Sep 26, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernel-toolsUpgrade kernelUpgrade kernel-tools-libsUpgrade python3-perf | Jul 17, 2024 | Apr 28, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Apr 28, 2024 |
| Suse | — | Upgrade kselftests-kmp-defaultUpgrade kernel-64kb-extraUpgrade kernel-obs-qaUpgrade kernel-defaultUpgrade kernel-syms-rtUpgrade kernel-default-baseUpgrade dtb-socionextUpgrade kernel-azure-vdsoUpgrade kernel-symsUpgrade reiserfs-kmp-defaultUpgrade cluster-md-kmp-defaultUpgrade dlm-kmp-rtUpgrade dtb-nvidiaUpgrade kernel-rt-livepatch-develUpgrade dlm-kmp-defaultUpgrade kselftests-kmp-rtUpgrade kernel-devel-rtUpgrade dlm-kmp-azureUpgrade kernel-64kb-develUpgrade dtb-amdUpgrade kernel-rt_debugUpgrade kernel-default-livepatch-develUpgrade dtb-mediatekUpgrade kernel-rt_debug-vdsoUpgrade dtb-xilinxUpgrade dtb-rockchipUpgrade kernel-docsUpgrade dtb-sprdUpgrade cluster-md-kmp-64kbUpgrade dtb-apmUpgrade dtb-amlogicUpgrade dtb-renesasUpgrade kernel-debug-livepatch-develUpgrade kernel-default-extraUpgrade reiserfs-kmp-rtUpgrade kernel-rt_debug-livepatch-develUpgrade reiserfs-kmp-azureUpgrade kernel-macrosUpgrade ocfs2-kmp-rtUpgrade kernel-default-base-rebuildUpgrade kernel-rt-extraUpgrade dtb-armUpgrade kernel-rt-develUpgrade gfs2-kmp-rtUpgrade dtb-freescaleUpgrade dtb-exynosUpgrade kernel-debug-vdsoUpgrade kernel-debug-develUpgrade gfs2-kmp-azureUpgrade kernel-default-develUpgrade kernel-default-livepatchUpgrade kernel-kvmsmall-vdsoUpgrade kernel-source-azureUpgrade ocfs2-kmp-64kbUpgrade cluster-md-kmp-rtUpgrade kernel-source-vanillaUpgrade kernel-debugUpgrade dlm-kmp-64kbUpgrade kernel-zfcpdumpUpgrade dtb-appleUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-64kb-livepatch-develUpgrade dtb-marvellUpgrade dtb-hisiliconUpgrade dtb-broadcomUpgrade kernel-obs-buildUpgrade kernel-azureUpgrade dtb-lgUpgrade kernel-default-optionalUpgrade dtb-caviumUpgrade kernel-syms-azureUpgrade kernel-sourceUpgrade kernel-preempt-develUpgrade kernel-azure-optionalUpgrade kernel-devel-azureUpgrade kernel-azure-develUpgrade kernel-64kbUpgrade kernel-rt-vdsoUpgrade kernel-preemptUpgrade kernel-source-rtUpgrade kernel-default-vdsoUpgrade kernel-azure-livepatch-develUpgrade ocfs2-kmp-azureUpgrade kselftests-kmp-64kbUpgrade kernel-rt-livepatchUpgrade cluster-md-kmp-azureUpgrade kernel-rtUpgrade kernel-docs-htmlUpgrade gfs2-kmp-defaultUpgrade dtb-qcomUpgrade dtb-amazonUpgrade dtb-allwinnerUpgrade kernel-kvmsmallUpgrade kernel-kvmsmall-develUpgrade kselftests-kmp-azureUpgrade kernel-rt_debug-develUpgrade dtb-alteraUpgrade reiserfs-kmp-64kbUpgrade kernel-azure-extraUpgrade kernel-rt-optionalUpgrade ocfs2-kmp-defaultUpgrade kernel-develUpgrade kernel-64kb-optionalUpgrade gfs2-kmp-64kb | Aug 9, 2024 | Apr 28, 2024 |
| Ubuntu | — | Upgrade linux-iotUpgrade linux-hwe-5.15Upgrade linux-azure-fde-5.15Upgrade linux-gcp-fipsUpgrade linux-intel-iotg-5.15Upgrade linux-ibm-5.4Upgrade linux-lowlatencyUpgrade linux-aws-5.4Upgrade linux-ibmUpgrade linux-hwe-5.4Upgrade linux-aws-fipsUpgrade linux-azureUpgrade linux-azure-fdeUpgrade linux-azure-fipsUpgrade linux-awsUpgrade linux-gkeop-5.15Upgrade linuxUpgrade linux-raspiUpgrade linux-azure-5.4Upgrade linux-aws-5.15Upgrade linux-realtimeUpgrade linux-gkeopUpgrade linux-riscv-5.15Upgrade linux-nvidiaUpgrade linux-kvmUpgrade linux-oracle-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-oracle-5.15Upgrade linux-raspi-5.4Upgrade linux-azure-5.15Upgrade linux-gcp-5.15Upgrade linux-gcpUpgrade linux-gkeUpgrade linux-gcp-5.4Upgrade linux-fipsUpgrade linux-bluefieldUpgrade linux-oracle | Nov 19, 2024 | Apr 28, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Apr 28, 2024 |
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