CVE-2024-35849btrfs: fix information leak in btrfs_ioctl_logical_to_ino()
- 7.1HighCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 82% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected a542ad1bafc7df9fc16de8a6894b350a4df75572 – < 689efe22e9b5b7d9d523119a9a5c3c17107a0772
- affected a542ad1bafc7df9fc16de8a6894b350a4df75572 – < 73db209dcd4ae026021234d40cfcb2fb5b564b86
- affected a542ad1bafc7df9fc16de8a6894b350a4df75572 – < 30189e54ba80e3209d34cfeea87b848f6ae025e6
- affected a542ad1bafc7df9fc16de8a6894b350a4df75572 – < e58047553a4e859dafc8d1d901e1de77c9dd922d
- affected a542ad1bafc7df9fc16de8a6894b350a4df75572 – < 8bdbcfaf3eac42f98e5486b3d7e130fa287811f6
- affected a542ad1bafc7df9fc16de8a6894b350a4df75572 – < 3a63cee1a5e14a3e52c19142c61dd5fcb524f6dc
- affected a542ad1bafc7df9fc16de8a6894b350a4df75572 – < fddc19631c51d9c17d43e9f822a7bc403af88d54
- affected a542ad1bafc7df9fc16de8a6894b350a4df75572 – < 2f7ef5bb4a2f3e481ef05fab946edb97c84f67cf
- affected 3.2
- unaffected < 3.2
- unaffected 4.19.313 – ≤ 4.19.*
- unaffected 5.4.275 – ≤ 5.4.*
- unaffected 5.10.216 – ≤ 5.10.*
- unaffected 5.15.158 – ≤ 5.15.*
- unaffected 6.1.90 – ≤ 6.1.*
- unaffected 6.6.30 – ≤ 6.6.*
- unaffected 6.8.9 – ≤ 6.8.*
- unaffected 6.9 – ≤ *
References
References11
- https://git.kernel.org/stable/c/689efe22e9b5b7d9d523119a9a5c3c17107a0772 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/73db209dcd4ae026021234d40cfcb2fb5b564b86 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/30189e54ba80e3209d34cfeea87b848f6ae025e6 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/e58047553a4e859dafc8d1d901e1de77c9dd922d (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/8bdbcfaf3eac42f98e5486b3d7e130fa287811f6 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/3a63cee1a5e14a3e52c19142c61dd5fcb524f6dc (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/fddc19631c51d9c17d43e9f822a7bc403af88d54 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/2f7ef5bb4a2f3e481ef05fab946edb97c84f67cf (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-35567 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-35849)Record last updated .