298 lines
17 KiB
JSON
298 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-40044",
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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": "2025-04-16T07:20:57.154Z",
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"datePublished": "2025-10-28T11:48:22.827Z",
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"dateUpdated": "2026-10-15T22:02:36.730Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:07:17.312Z"
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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\nfs: udf: fix OOB read in lengthAllocDescs handling\n\nWhen parsing Allocation Extent Descriptor, lengthAllocDescs comes from\non-disk data and must be validated against the block size. Crafted or\ncorrupted images may set lengthAllocDescs so that the total descriptor\nlength (sizeof(allocExtDesc) + lengthAllocDescs) exceeds the buffer,\nleading udf_update_tag() to call crc_itu_t() on out-of-bounds memory and\ntrigger a KASAN use-after-free read.\n\nBUG: KASAN: use-after-free in crc_itu_t+0x1d5/0x2b0 lib/crc-itu-t.c:60\nRead of size 1 at addr ffff888041e7d000 by task syz-executor317/5309\n\nCPU: 0 UID: 0 PID: 5309 Comm: syz-executor317 Not tainted 6.12.0-rc4-syzkaller-00261-g850925a8133c #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n crc_itu_t+0x1d5/0x2b0 lib/crc-itu-t.c:60\n udf_update_tag+0x70/0x6a0 fs/udf/misc.c:261\n udf_write_aext+0x4d8/0x7b0 fs/udf/inode.c:2179\n extent_trunc+0x2f7/0x4a0 fs/udf/truncate.c:46\n udf_truncate_tail_extent+0x527/0x7e0 fs/udf/truncate.c:106\n udf_release_file+0xc1/0x120 fs/udf/file.c:185\n __fput+0x23f/0x880 fs/file_table.c:431\n task_work_run+0x24f/0x310 kernel/task_work.c:239\n exit_task_work include/linux/task_work.h:43 [inline]\n do_exit+0xa2f/0x28e0 kernel/exit.c:939\n do_group_exit+0x207/0x2c0 kernel/exit.c:1088\n __do_sys_exit_group kernel/exit.c:1099 [inline]\n __se_sys_exit_group kernel/exit.c:1097 [inline]\n __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097\n x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n </TASK>\n\nValidate the computed total length against epos->bh->b_size.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
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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:N/UI:R/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 - The vulnerability is triggered by parsing a crafted UDF filesystem image presented as local storage (removable media or a loop-mounted file); all trigger paths are local syscalls (mount/statfs, readdir, read, close, unlink) on the mounted volume. No network protocol handling is involved.\nAC:L - The attacker fully controls the on-disk `lengthAllocDescs` field and simply sets it larger than the block size, which deterministically drives `alen` past the buffer with no race, timing, or memory-layout condition outside their control.\nPR:N - The attacker needs no account or privileges on the target system — they only author the malicious UDF image/media (the DVD/Blu-ray/USB-stick format), and the mount is performed by an automounter or the victim; after mount, every trigger path is available to any unprivileged reader of the volume.\nUI:R - Exploitation requires the crafted image to be mounted, i.e. a victim inserting the media or mounting the image (udisks2/desktop automount counts as the required action), followed by ordinary access such as `ls` or opening and closing a file.\nS:U - The out-of-bounds read and write stay within the kernel's own heap and the kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `udf_get_fileshortad()`/`udf_get_filelongad()` are bounded only by the bogus `alen`, allowing reads of kernel heap up to ~4 GiB past the buffer (confirmed KASAN use-after-free read), and the values harvested from freed/adjacent memory are used as block locations and extent lengths that steer subsequent I/O and directory results.\nI:H - `udf_write_aext()` writes an 8- or 16-byte extent descriptor at `bh->b_data + epos->offset` with the offset unbounded and the contents attacker-influenced, giving a heap out-of-bounds write suitable for control-structure corruption; `extent_trunc()` additionally frees blocks named by out-of-bounds-read data, corrupting on-disk allocation bitmaps.\nA:H - The reported syzbot reproducer produces a KASAN use-after-free read in `crc_itu_t()`, and the unbounded ~4 GiB CRC scan past the buffer reliably faults into unmapped memory, causing a kernel oops/panic."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/udf/inode.c"
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],
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"versions": [
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "14496175b264d30c2045584ee31d062af2e3a660",
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"status": "affected",
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "d2ed9aa8ae50fb0d4ac5ab07e4c67ba7e9a24818",
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"status": "affected",
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"status": "affected",
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"status": "affected",
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"lessThan": "459404f858213967ccfff336c41747d8dd186d38",
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"status": "affected",
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"lessThan": "3bd5e45c2ce30e239d596becd5db720f7eb83c99",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/udf/inode.c"
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],
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"versions": [
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{
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"version": "2.6.12",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.12",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.301",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.246",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.195",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.156",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.112",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.53",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17.3",
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"lessThanOrEqual": "6.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/14496175b264d30c2045584ee31d062af2e3a660"
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},
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{
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"url": "https://git.kernel.org/stable/c/d2ed9aa8ae50fb0d4ac5ab07e4c67ba7e9a24818"
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},
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{
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"url": "https://git.kernel.org/stable/c/1d1847812a1a5375c10a2a779338df643f79c047"
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},
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{
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"url": "https://git.kernel.org/stable/c/918649364fbca7d5df72522ca795479edcd25f91"
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},
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{
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"url": "https://git.kernel.org/stable/c/a70dcfa8d0a0cc530a6af59483dfca260b652c1b"
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},
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{
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"url": "https://git.kernel.org/stable/c/b57f2d7d3e6bb89ed82330c5fe106cdfa34d3e24"
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},
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{
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"url": "https://git.kernel.org/stable/c/459404f858213967ccfff336c41747d8dd186d38"
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},
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{
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"url": "https://git.kernel.org/stable/c/3bd5e45c2ce30e239d596becd5db720f7eb83c99"
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}
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],
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"title": "fs: udf: fix OOB read in lengthAllocDescs handling",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-40044",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:56:23.726969Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T22:02:36.730Z"
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}
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}
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]
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}
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} |