359 lines
19 KiB
JSON
359 lines
19 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-37078",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-06-24T13:54:11.068Z",
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"datePublished": "2024-06-25T14:22:35.558Z",
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"dateUpdated": "2026-08-05T11:32:29.653Z"
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},
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"dateUpdated": "2026-08-05T11:32:29.653Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix potential kernel bug due to lack of writeback flag waiting\n\nDestructive writes to a block device on which nilfs2 is mounted can cause\na kernel bug in the folio/page writeback start routine or writeback end\nroutine (__folio_start_writeback in the log below):\n\n kernel BUG at mm/page-writeback.c:3070!\n Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n ...\n RIP: 0010:__folio_start_writeback+0xbaa/0x10e0\n Code: 25 ff 0f 00 00 0f 84 18 01 00 00 e8 40 ca c6 ff e9 17 f6 ff ff\n e8 36 ca c6 ff 4c 89 f7 48 c7 c6 80 c0 12 84 e8 e7 b3 0f 00 90 <0f>\n 0b e8 1f ca c6 ff 4c 89 f7 48 c7 c6 a0 c6 12 84 e8 d0 b3 0f 00\n ...\n Call Trace:\n <TASK>\n nilfs_segctor_do_construct+0x4654/0x69d0 [nilfs2]\n nilfs_segctor_construct+0x181/0x6b0 [nilfs2]\n nilfs_segctor_thread+0x548/0x11c0 [nilfs2]\n kthread+0x2f0/0x390\n ret_from_fork+0x4b/0x80\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n\nThis is because when the log writer starts a writeback for segment summary\nblocks or a super root block that use the backing device's page cache, it\ndoes not wait for the ongoing folio/page writeback, resulting in an\ninconsistent writeback state.\n\nFix this issue by waiting for ongoing writebacks when putting\nfolios/pages on the backing device into writeback state."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Exploitation requires local access to the system to write to the block device node backing a mounted nilfs2 filesystem and to generate filesystem activity that drives log construction. There is no remote or adjacent-network path into fs/nilfs2/segment.c.\nAC:L - Although the flaw is a race between the block-device writeback path and the nilfs2 log writer, the attacker controls both sides — issuing the buffered device writes plus sync/fsync, and driving segment construction via filesystem I/O — and can retry in a tight loop until it lands. The fix author reproduced it deterministically with ordinary destructive device writes.\nPR:L - Only an unprivileged local account with write access to the device node is needed (disk-group service accounts, logind/udisks-ACL'd removable media on desktops and kiosks, or a container granted the device); no CAP_SYS_ADMIN is required for the triggering writes themselves.\nUI:N - Once a nilfs2 filesystem is mounted — a routine system state, not an attacker-supplied crafted image — the attacker acts entirely alone. No victim action is needed at any point in the attack.\nS:U - The corruption is confined to kernel page-cache state and the kernel's own memory; no VM, IOMMU, or sandbox boundary is crossed. Impact and vulnerable component share the same security authority.\nC:H - Premature clearing of PG_writeback removes the only protection keeping the folio alive under in-flight I/O (bio_add_folio takes no page reference), so the page can be truncated/reclaimed and reused while nilfs2's write bio still DMAs from it — leaking arbitrary reused kernel page contents onto the block device, which the attacker can read back.\nI:H - The same broken invariant makes nilfs2's completion handler call folio_end_writeback() on freed folio memory, a use-after-free write into a reclaimed and potentially heap-sprayed object, which is the classic primitive for control-flow hijacking. Filesystem metadata is additionally written from a page concurrently mutated by another writer.\nA:H - The documented outcome is a kernel BUG()/oops in the segctor kthread (mm/page-writeback.c), and on non-DEBUG_VM kernels the XOR in __folio_end_writeback re-sets PG_writeback on an idle folio, producing permanently hung unkillable tasks in folio_wait_writeback() plus writeback-accounting skew that stalls system-wide dirty throttling."
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}
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