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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: detect invalid INLINE_DATA + EXTENTS flag combination\n\nsyzbot reported a BUG_ON in ext4_es_cache_extent() when opening a verity\nfile on a corrupted ext4 filesystem mounted without a journal.\n\nThe issue is that the filesystem has an inode with both the INLINE_DATA\nand EXTENTS flags set:\n\n    EXT4-fs error (device loop0): ext4_cache_extents:545: inode #15:\n    comm syz.0.17: corrupted extent tree: lblk 0 \u003c prev 66\n\nInvestigation revealed that the inode has both flags set:\n    DEBUG: inode 15 - flag=1, i_inline_off=164, has_inline=1, extents_flag=1\n\nThis is an invalid combination since an inode should have either:\n- INLINE_DATA: data stored directly in the inode\n- EXTENTS: data stored in extent-mapped blocks\n\nHaving both flags causes ext4_has_inline_data() to return true, skipping\nextent tree validation in __ext4_iget(). The unvalidated out-of-order\nextents then trigger a BUG_ON in ext4_es_cache_extent() due to integer\nunderflow when calculating hole sizes.\n\nFix this by detecting this invalid flag combination early in ext4_iget()\nand rejecting the corrupted inode."
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              "value": "AV:L - The invalid flag combination can only be delivered on a crafted ext4 on-disk image attached locally (USB stick, SD card, loop-mounted file), and the bug fires during `ext4_iget()`/`ext4_map_blocks()` on the local mount; there is no network-facing input into this code path.\nAC:L - The attacker fully controls the image and merely sets both INLINE_DATA_FL and EXTENTS_FL on an inode with a `system.data` xattr, formatting without a journal \u2014 this deterministically bypasses `ext4_ext_check_inode()` and trips `BUG_ON(end \u003c lblk)` on every open, with no race, timing, or memory-layout condition outside the attacker\u0027s control.\nPR:N - The attacker needs no account or privilege on the target \u2014 they only supply the malicious filesystem image, and the privileged mount plus the subsequent file access are performed by the victim, an indexer/thumbnailer, or an automounter such as udisks2 or vold.\nUI:R - Because `ext4_fs_type` lacks `FS_USERNS_MOUNT` and `INLINE_DATA_FL` is not in `EXT4_FL_USER_MODIFIABLE`, the corrupt inode cannot be created on a live filesystem; a user or automounter must actually mount the attacker-supplied ext4 image.\nS:U - The out-of-bounds accesses and the panic are confined to the mounting host\u0027s kernel memory and its own filesystem, within a single security authority; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Skipping `__ext4_ext_check()` leaves `eh_entries` unvalidated (up to 65535 versus the 4 that fit in the 60-byte `i_block[]`), so `ext4_cache_extents()` and `ext4_ext_binsearch()` read hundreds of kilobytes past the `ext4_inode_info` slab object, and those out-of-bounds kernel bytes are interpreted as physical block numbers that drive real disk reads and are reported back to userspace through FIEMAP.\nI:H - The unvalidated `eh_max` defeats the `eh_entries \u003e= eh_max` guard in `ext4_ext_insert_extent()`, so extent entries are memmoved and written past the end of `i_block[]` into adjacent `ext4_inode_info` slab fields, giving a heap out-of-bounds write; the missing `ext4_valid_extent()`/`ext4_inode_block_valid()` check additionally lets writes and block frees land on superblock, bitmap, and group-descriptor blocks.\nA:H - The out-of-order extents produce an integer underflow in `lblk - prev` and hit `BUG_ON(end \u003c lblk)` in `ext4_es_cache_extent()`, an immediate and reliably reproducible kernel panic on every access to the crafted file; the out-of-bounds slab reads independently oops the kernel on KASAN and hardened builds."
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              "value": "AV:L - The unbounded growth is driven by the local transmit path (`ip6_tnl_xmit`) and requires the attacker to establish a two-tunnel routing loop and then push packets into it, which is done via netlink/socket operations on the local system. A purely remote attacker cannot create the required tunnel topology, so the reliable, fully attacker-controlled path is local.\nAC:L - The attacker controls every precondition \u2014 tunnel creation, the looping routes, and the packet stream \u2014 and each transmitted packet deterministically increments `dev-\u003eneeded_headroom` until the u16 header offset wraps; no race, memory-layout luck, or victim state is involved.\nPR:L - Configuring ip6tnl/ip6gre devices and routes needs CAP_NET_ADMIN, but an unprivileged user gains that in their own network namespace with `unshare -Urn`, and the resulting heap corruption is not confined to that namespace.\nUI:N - The attacker creates the tunnels and generates the traffic itself; no action by any other user or administrator is required.\nS:U - The corruption occurs in kernel memory within the same security authority; there is no VM, IOMMU, or hypervisor boundary crossed, making this standard in-kernel privilege escalation.\nC:H - Once `network_header` wraps, `skb-\u003edata` points outside `skb-\u003ehead`, producing out-of-bounds/use-after-free reads \u2014 the IPv4 twin of this bug was reported as a KASAN use-after-free read in `__skb_flow_dissect`, and such reads can disclose arbitrary adjacent kernel heap contents.\nI:H - After the negative `__skb_pull`, `dev_hard_header()` pushes and writes an L2 header at the out-of-bounds `skb-\u003edata`, giving an out-of-bounds write into unrelated kernel heap memory that can be leveraged for control-flow hijacking.\nA:H - The wrapped offsets and out-of-bounds accesses reliably produce kernel oops/panic, and the runaway headroom also forces ever-larger skb head reallocations, exhausting memory and destabilizing the system."
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