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CVE-2025-40044

fs: udf: fix OOB read in lengthAllocDescs handling

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.301, 5.10.246, 5.15.195, 6.1.156, 6.6.112, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: fs: udf: fix OOB read in lengthAllocDescs handling When parsing Allocation Extent Descriptor, lengthAllocDescs comes from on-disk data and must be validated against the block size. Crafted or corrupted images may set lengthAllocDescs so that the total descriptor length (sizeof(allocExtDesc) + lengthAllocDescs) exceeds the buffer, leading udf_update_tag() to call crc_itu_t() on out-of-bounds memory and trigger a KASAN use-after-free read. BUG: KASAN: use-after-free in crc_itu_t+0x1d5/0x2b0 lib/crc-itu-t.c:60 Read of size 1 at addr ffff888041e7d000 by task syz-executor317/5309 CPU: 0 UID: 0 PID: 5309 Comm: syz-executor317 Not tainted 6.12.0-rc4-syzkaller-00261-g850925a8133c #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 crc_itu_t+0x1d5/0x2b0 lib/crc-itu-t.c:60 udf_update_tag+0x70/0x6a0 fs/udf/misc.c:261 udf_write_aext+0x4d8/0x7b0 fs/udf/inode.c:2179 extent_trunc+0x2f7/0x4a0 fs/udf/truncate.c:46 udf_truncate_tail_extent+0x527/0x7e0 fs/udf/truncate.c:106 udf_release_file+0xc1/0x120 fs/udf/file.c:185 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> Validate the computed total length against epos->bh->b_size. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 14496175b264d30c2045584ee31d062af2e3a660; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in d2ed9aa8ae50fb0d4ac5ab07e4c67ba7e9a24818; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 1d1847812a1a5375c10a2a779338df643f79c047; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 918649364fbca7d5df72522ca795479edcd25f91; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in a70dcfa8d0a0cc530a6af59483dfca260b652c1b; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in b57f2d7d3e6bb89ed82330c5fe106cdfa34d3e24; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 459404f858213967ccfff336c41747d8dd186d38; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 3bd5e45c2ce30e239d596becd5db720f7eb83c99

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.4.301; From 5.5.0 · fixed in 5.10.246; From 5.11.0 · fixed in 5.15.195; From 5.16.0 · fixed in 6.1.156; From 6.2.0 · fixed in 6.6.112; From 6.7.0 · fixed in 6.12.53; From 6.13.0 · fixed in 6.17.3

References 8

git.kernel.org