CVE-2024-35849

btrfs: fix information leak in btrfs_ioctl_logical_to_ino()

HIGH

7.1

CVSS Score

Published: May 17, 2024 at 02:47 PM UTC

Updated: October 15, 2026 at 01:17 AM UTC

3 products affected across 3 vendorsLinux KernelDebian LinuxSIMATIC S7-1500 TM MFP

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Severity

HIGH7.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix information leak in btrfs_ioctl_logical_to_ino() Syzbot reported the following information leak for in btrfs_ioctl_logical_to_ino(): BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x110 lib/usercopy.c:40 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _copy_to_user+0xbc/0x110 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:191 [inline] btrfs_ioctl_logical_to_ino+0x440/0x750 fs/btrfs/ioctl.c:3499 btrfs_ioctl+0x714/0x1260 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __kmalloc_large_node+0x231/0x370 mm/slub.c:3921 __do_kmalloc_node mm/slub.c:3954 [inline] __kmalloc_node+0xb07/0x1060 mm/slub.c:3973 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0xc0/0x2d0 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] init_data_container+0x49/0x1e0 fs/btrfs/backref.c:2779 btrfs_ioctl_logical_to_ino+0x17c/0x750 fs/btrfs/ioctl.c:3480 btrfs_ioctl+0x714/0x1260 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Bytes 40-65535 of 65536 are uninitialized Memory access of size 65536 starts at ffff888045a40000 This happens, because we're copying a 'struct btrfs_data_container' back to user-space. This btrfs_data_container is allocated in 'init_data_container()' via kvmalloc(), which does not zero-fill the memory. Fix this by using kvzalloc() which zeroes out the memory on allocation.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

10.0

Linux Kernel · Linux

95%

v < 4.19.3134.20 ≤ v < 5.4.2755.11 ≤ v < 5.15.1585.16 ≤ v < 6.1.905.5 ≤ v < 5.10.2166.2 ≤ v < 6.6.306.7 ≤ v < 6.8.96.9 6.9 rc1 6.9 rc2 6.9 rc3 6.9 rc4 6.9 rc5a542ad1bafc7df9fc16de8a6894b350a4df75572

Vendor states this is fixed in 2f7ef5bb4a2f3e481ef05fab946edb97c84f67cf (fixed)

Vendor states this is fixed in 30189e54ba80e3209d34cfeea87b848f6ae025e6 (fixed)

Vendor states this is fixed in 3a63cee1a5e14a3e52c19142c61dd5fcb524f6dc (fixed)

Vendor states this is fixed in 689efe22e9b5b7d9d523119a9a5c3c17107a0772 (fixed)

Vendor states this is fixed in 73db209dcd4ae026021234d40cfcb2fb5b564b86 (fixed)

Vendor states this is fixed in 8bdbcfaf3eac42f98e5486b3d7e130fa287811f6 (fixed)

Vendor states this is fixed in e58047553a4e859dafc8d1d901e1de77c9dd922d (fixed)

Vendor states this is fixed in fddc19631c51d9c17d43e9f822a7bc403af88d54 (fixed)

Vendor states this is fixed in 3.2 (unaffected)

Vendor states this is fixed in 4.19.313 (unaffected)

Vendor states this is fixed in 5.10.216 (unaffected)

Vendor states this is fixed in 5.15.158 (unaffected)