7.5

CVE-2025-68261: linux

CVSS: 7.5v3.1HighDeferred
AliasesUBUNTU-CVE-2025-68261DEBIAN-CVE-2025-68261
Published 16-12-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-68261 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 45% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.55%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 47 · Related 45
DLA-4475-1DLA-4476-1DSA-6127-1OPENSUSE-SU-2025:15836-1OPENSUSE-SU-2026:10301-1OPENSUSE-SU-2026:20287-1

Timeline

  1. 16-12-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

+0.01 pp

From 0.54% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.55%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-173.183 | < 6.8.0-110.110 | < 6.17.0-19.19
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1052.55 | < 6.17.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.162-1 | < 6.12.63-1 | < 6.17.12-1
Linux1 product
  • linux≥ c755e251357a0cee0679081f08c3f4ba797a8009, < b322bac9f01d03190b5abc52be5d9dd9f22a2b41 | ≥ c755e251357a0cee0679081f08c3f4ba797a8009, < 61e03dc3794ebf77a706b85e5a36c9c6d70be6de | ≥ c755e251357a0cee0679081f08c3f4ba797a8009, < 5b266cf6851ce72b11b067fe02adf5a8687104ad | ≥ c755e251357a0cee0679081f08c3f4ba797a8009, < 144c48da33a01d92995aeccd8208eb47d2a8e659 | ≥ c755e251357a0cee0679081f08c3f4ba797a8009, < 22a76b0861ae61a299c8e126c1aca8c4fda820fd | ≥ c755e251357a0cee0679081f08c3f4ba797a8009, < ba8aeff294ac7ff6dfe293663d815c54c5ee218c | ≥ c755e251357a0cee0679081f08c3f4ba797a8009, < 5cad18e527ba8a9ca5463cc170073eeb5a4826f4 | ≥ c755e251357a0cee0679081f08c3f4ba797a8009, < 0cd8feea8777f8d9b9a862b89c688b049a5c8475 | 3e96c3fdcfccb321a9e1623f78cc71b44593e965 | 5781ac24bbd998ebb1ff30143bb06244d847af48 | 9b06cce3ca4d60d442c39bfa7c058b71b1cee6c2 | da1e40237f8f3516581b534c484c236a79ccfd14 | 7cf6b709b6412afd1d93b2c4b37163c3602e3b95 | ≥ 3.16.44, < 3.17 | ≥ 3.18.107, < 3.19 | ≥ 4.4.129, < 4.5 | ≥ 4.9.14, < 4.10 | ≥ 4.10.2, < 4.11 | 4.11

3 vendors · 158 products

References

45 links
Show all 45 references