High 7.1Published May 17, 2024

CVE-2024-35849btrfs: fix information leak in btrfs_ioctl_logical_to_ino()

Updated under an hour ago (2026-10-19 07:00 UTC)

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Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a542ad1bafc7df9fc16de8a6894b350a4df75572 before 689efe22e9b5b7d9d523119a9a5c3c17107a0772; from a542ad1bafc7df9fc16de8a6894b350a4df75572 before 73db209dcd4ae026021234d40cfcb2fb5b564b86; from a542ad1bafc7df9fc16de8a6894b350a4df75572 before 30189e54ba80e3209d34cfeea87b848f6ae025e6; from a542ad1bafc7df9fc16de8a6894b350a4df75572 before e58047553a4e859dafc8d1d901e1de77c9dd922d; from a542ad1bafc7df9fc16de8a6894b350a4df75572 before 8bdbcfaf3eac42f98e5486b3d7e130fa287811f6; from a542ad1bafc7df9fc16de8a6894b350a4df75572 before 3a63cee1a5e14a3e52c19142c61dd5fcb524f6dc; from a542ad1bafc7df9fc16de8a6894b350a4df75572 before fddc19631c51d9c17d43e9f822a7bc403af88d54; from a542ad1bafc7df9fc16de8a6894b350a4df75572 before 2f7ef5bb4a2f3e481ef05fab946edb97c84f67cf	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1.1	CISA ADP
linux linux_kernel linux:linux_kernel	before 4.19.313; from 4.20 before 5.4.275; from 5.5 before 5.10.216; from 5.11 before 5.15.158; from 5.16 before 6.1.90; from 6.2 before 6.6.30; from 6.7 before 6.8.9; 6.9; and 4 more ranges	NVD
debian debian_linux debian:debian_linux	10.0	NVD

References

https://git.kernel.org/stable/c/689efe22e9b5b7d9d523119a9a5c3c17107a0772patch
https://git.kernel.org/stable/c/73db209dcd4ae026021234d40cfcb2fb5b564b86patch
https://git.kernel.org/stable/c/30189e54ba80e3209d34cfeea87b848f6ae025e6patch
https://git.kernel.org/stable/c/e58047553a4e859dafc8d1d901e1de77c9dd922dpatch
https://git.kernel.org/stable/c/8bdbcfaf3eac42f98e5486b3d7e130fa287811f6patch
https://git.kernel.org/stable/c/3a63cee1a5e14a3e52c19142c61dd5fcb524f6dcpatch
https://git.kernel.org/stable/c/fddc19631c51d9c17d43e9f822a7bc403af88d54patch
https://git.kernel.org/stable/c/2f7ef5bb4a2f3e481ef05fab946edb97c84f67cfpatch
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlmailing-list
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlmailing-list
https://cert-portal.siemens.com/productcert/html/ssa-265688.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.