CVE-2025-68261

ext4: add i_data_sem protection in ext4_destroy_inline_data_nolock()

State: Published
Severity: 7.5 High
Published: Dec 16, 2025
Updated: Oct 15, 2026
Reserved: Dec 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

ext4: add i_data_sem protection in ext4_destroy_inline_data_nolock()

Fix a race between inline data destruction and block mapping.

The function ext4_destroy_inline_data_nolock() changes the inode data layout by clearing EXT4_INODE_INLINE_DATA and setting EXT4_INODE_EXTENTS. At the same time, another thread may execute ext4_map_blocks(), which tests EXT4_INODE_EXTENTS to decide whether to call ext4_ext_map_blocks() or ext4_ind_map_blocks().

Without i_data_sem protection, ext4_ind_map_blocks() may receive inode with EXT4_INODE_EXTENTS flag and triggering assert.

kernel BUG at fs/ext4/indirect.c:546! EXT4-fs (loop2): unmounting filesystem. invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:ext4_ind_map_blocks.cold+0x2b/0x5a fs/ext4/indirect.c:546

Call Trace: <TASK> ext4_map_blocks+0xb9b/0x16f0 fs/ext4/inode.c:681 _ext4_get_block+0x242/0x590 fs/ext4/inode.c:822 ext4_block_write_begin+0x48b/0x12c0 fs/ext4/inode.c:1124 ext4_write_begin+0x598/0xef0 fs/ext4/inode.c:1255 ext4_da_write_begin+0x21e/0x9c0 fs/ext4/inode.c:3000 generic_perform_write+0x259/0x5d0 mm/filemap.c:3846 ext4_buffered_write_iter+0x15b/0x470 fs/ext4/file.c:285 ext4_file_write_iter+0x8e0/0x17f0 fs/ext4/file.c:679 call_write_iter include/linux/fs.h:2271 [inline] do_iter_readv_writev+0x212/0x3c0 fs/read_write.c:735 do_iter_write+0x186/0x710 fs/read_write.c:861 vfs_iter_write+0x70/0xa0 fs/read_write.c:902 iter_file_splice_write+0x73b/0xc90 fs/splice.c:685 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0x10f/0x170 fs/splice.c:950 splice_direct_to_actor+0x33a/0xa10 fs/splice.c:896 do_splice_direct+0x1a9/0x280 fs/splice.c:1002 do_sendfile+0xb13/0x12c0 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x1cf/0x210 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c755e251357a0cee0679081f08c3f4ba797a8009 to before b322bac9f01d03190b5abc52be5d9dd9f22a2b41Affected c755e251357a0cee0679081f08c3f4ba797a8009 to before 61e03dc3794ebf77a706b85e5a36c9c6d70be6deAffected c755e251357a0cee0679081f08c3f4ba797a8009 to before 5b266cf6851ce72b11b067fe02adf5a8687104adAffected c755e251357a0cee0679081f08c3f4ba797a8009 to before 144c48da33a01d92995aeccd8208eb47d2a8e659Affected c755e251357a0cee0679081f08c3f4ba797a8009 to before 22a76b0861ae61a299c8e126c1aca8c4fda820fdAffected c755e251357a0cee0679081f08c3f4ba797a8009 to before ba8aeff294ac7ff6dfe293663d815c54c5ee218cAffected c755e251357a0cee0679081f08c3f4ba797a8009 to before 5cad18e527ba8a9ca5463cc170073eeb5a4826f4Affected c755e251357a0cee0679081f08c3f4ba797a8009 to before 0cd8feea8777f8d9b9a862b89c688b049a5c8475Affected 3e96c3fdcfccb321a9e1623f78cc71b44593e965Affected 5781ac24bbd998ebb1ff30143bb06244d847af48Affected 9b06cce3ca4d60d442c39bfa7c058b71b1cee6c2Affected da1e40237f8f3516581b534c484c236a79ccfd14Affected 7cf6b709b6412afd1d93b2c4b37163c3602e3b95Affected 3.16.44 to before 3.17Affected 3.18.107 to before 3.19Affected 4.4.129 to before 4.5Affected 4.9.14 to before 4.10Affected 4.10.2 to before 4.11Affected
LinuxLinux	4.11Affected before 4.11Not affected 5.10.248 through 5.10.Not affected 5.15.198 through 5.15.Not affected 6.1.160 through 6.1.Not affected 6.6.120 through 6.6.Not affected 6.12.62 through 6.12.Not affected 6.17.12 through 6.17.Not affected 6.18.1 through 6.18.*Not affected 6.19 and laterNot affected

Product

Versions

LinuxLinux

c755e251357a0cee0679081f08c3f4ba797a8009 to before b322bac9f01d03190b5abc52be5d9dd9f22a2b41Affected
c755e251357a0cee0679081f08c3f4ba797a8009 to before 61e03dc3794ebf77a706b85e5a36c9c6d70be6deAffected
c755e251357a0cee0679081f08c3f4ba797a8009 to before 5b266cf6851ce72b11b067fe02adf5a8687104adAffected
c755e251357a0cee0679081f08c3f4ba797a8009 to before 144c48da33a01d92995aeccd8208eb47d2a8e659Affected
c755e251357a0cee0679081f08c3f4ba797a8009 to before 22a76b0861ae61a299c8e126c1aca8c4fda820fdAffected
c755e251357a0cee0679081f08c3f4ba797a8009 to before ba8aeff294ac7ff6dfe293663d815c54c5ee218cAffected
c755e251357a0cee0679081f08c3f4ba797a8009 to before 5cad18e527ba8a9ca5463cc170073eeb5a4826f4Affected
c755e251357a0cee0679081f08c3f4ba797a8009 to before 0cd8feea8777f8d9b9a862b89c688b049a5c8475Affected
3e96c3fdcfccb321a9e1623f78cc71b44593e965Affected
5781ac24bbd998ebb1ff30143bb06244d847af48Affected
9b06cce3ca4d60d442c39bfa7c058b71b1cee6c2Affected
da1e40237f8f3516581b534c484c236a79ccfd14Affected
7cf6b709b6412afd1d93b2c4b37163c3602e3b95Affected
3.16.44 to before 3.17Affected
3.18.107 to before 3.19Affected
4.4.129 to before 4.5Affected
4.9.14 to before 4.10Affected
4.10.2 to before 4.11Affected

LinuxLinux

4.11Affected
before 4.11Not affected
5.10.248 through 5.10.*Not affected
5.15.198 through 5.15.*Not affected
6.1.160 through 6.1.*Not affected
6.6.120 through 6.6.*Not affected
6.12.62 through 6.12.*Not affected
6.17.12 through 6.17.*Not affected
6.18.1 through 6.18.*Not affected
6.19 and laterNot affected

References

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