# CVE-2025-38163: f2fs: fix to do sanity check on sbi->total_valid_block_count CVE-2025-38163 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2025-38163, released July 3, 2025. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2025-38163 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0019 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 3, 2025 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38163 ## Description In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on sbi->total_valid_block_count syzbot reported a f2fs bug as below: ------------[ cut here ]------------ kernel BUG at fs/f2fs/f2fs.h:2521! RIP: 0010:dec_valid_block_count+0x3b2/0x3c0 fs/f2fs/f2fs.h:2521 Call Trace: f2fs_truncate_data_blocks_range+0xc8c/0x11a0 fs/f2fs/file.c:695 truncate_dnode+0x417/0x740 fs/f2fs/node.c:973 truncate_nodes+0x3ec/0xf50 fs/f2fs/node.c:1014 f2fs_truncate_inode_blocks+0x8e3/0x1370 fs/f2fs/node.c:1197 f2fs_do_truncate_blocks+0x840/0x12b0 fs/f2fs/file.c:810 f2fs_truncate_blocks+0x10d/0x300 fs/f2fs/file.c:838 f2fs_truncate+0x417/0x720 fs/f2fs/file.c:888 f2fs_setattr+0xc4f/0x12f0 fs/f2fs/file.c:1112 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x222/0x310 fs/open.c:65 handle_truncate fs/namei.c:3466 [inline] do_open fs/namei.c:3849 [inline] path_openat+0x2e4f/0x35d0 fs/namei.c:4004 do_filp_open+0x284/0x4e0 fs/namei.c:4031 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_creat fs/open.c:1522 [inline] __se_sys_creat fs/open.c:1516 [inline] __x64_sys_creat+0x124/0x170 fs/open.c:1516 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 The reason is: in fuzzed image, sbi->total_valid_block_count is inconsistent w/ mapped blocks indexed by inode, so, we should not trigger panic for such case, instead, let's print log and set fsck flag. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | bpftool ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-container ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-container ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-core ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-core ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-devel ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-devel ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-doc ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-doc ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-modules ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-modules ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k-core ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k-core ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k-devel ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k-devel ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k-modules ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k-modules ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k-modules-extra ol 8 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | kernel-uek64k-modules-extra ol 9 | 0:5.15.0-312.187.5.el9uek | [ELSA-2025-20552](https://patchblox.com/security/data/fix/linux/elsa-2025-20552.md) | Sep 8, 2025 | | Linux | linux Debian 12.15 (bookworm) | 6.1.147-1 | [DEBIAN-CVE-2025-38163](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38163.md) | Jul 3, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.12.35-1 | [DEBIAN-CVE-2025-38163](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38163.md) | Jul 3, 2025 | | Linux | linux Debian 14 | 6.12.35-1 | [DEBIAN-CVE-2025-38163](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38163.md) | Jul 3, 2025 | --- Data as of 2026-11-09T13:31:49Z UTC. 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