In the Linux kernel, the following vulnerability has been resolved:
exfat: check if cluster num is valid
Syzbot reported slab-out-of-bounds read in exfat_clear_bitmap. This was triggered by reproducer calling truncute with size 0, which causes the following trace:
BUG: KASAN: slab-out-of-bounds in exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 Read of size 8 at addr ffff888115aa9508 by task syz-executor251/365
Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3c0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181 __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217 exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243 exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339 notify_change+0xb76/0xe10 fs/attr.c:336 do_truncate+0x1ea/0x2d0 fs/open.c:65
Move the is_valid_cluster() helper from fatent.c to a common header to make it reusable in other *.c files. And add is_valid_cluster() to validate if cluster number is within valid range in exfat_clear_bitmap() and exfat_set_bitmap().
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade bpftoolUpgrade kernel-toolsUpgrade python-perfUpgrade kernel-develUpgrade perfUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernelUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.10.126-117.518Upgrade kernel-tools-develUpgrade python-perf-debuginfoUpgrade kernel-headersUpgrade kernel-livepatch-5.15.50-23.125Upgrade kernel-debuginfo | Mar 14, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Redhat_linux | — | — | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-riscv-5.15Upgrade linux-nvidiaUpgrade linux-aws-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-gcpUpgrade linux-oracleUpgrade linux-gcp-5.15Upgrade linux-realtimeUpgrade linux-ibmUpgrade linux-intel-iotgUpgrade linux-kvmUpgrade linux-lowlatency-hwe-5.15Upgrade linux-hwe-5.15Upgrade linux-gkeopUpgrade linux-oracle-5.15Upgrade linux-gkeUpgrade linux-awsUpgrade linux-raspiUpgrade linux-lowlatencyUpgrade linux-azureUpgrade linux-azure-5.15Upgrade linux | Mar 19, 2025 | Feb 26, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 26, 2025 |
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