{"id":"CVE-2025-68264","summary":"ext4: refresh inline data size before write operations","details":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: refresh inline data size before write operations\n\nThe cached ei-\u003ei_inline_size can become stale between the initial size\ncheck and when ext4_update_inline_data()/ext4_create_inline_data() use\nit. Although ext4_get_max_inline_size() reads the correct value at the\ntime of the check, concurrent xattr operations can modify i_inline_size\nbefore ext4_write_lock_xattr() is acquired.\n\nThis causes ext4_update_inline_data() and ext4_create_inline_data() to\nwork with stale capacity values, leading to a BUG_ON() crash in\next4_write_inline_data():\n\n  kernel BUG at fs/ext4/inline.c:1331!\n  BUG_ON(pos + len \u003e EXT4_I(inode)-\u003ei_inline_size);\n\nThe race window:\n1. ext4_get_max_inline_size() reads i_inline_size = 60 (correct)\n2. Size check passes for 50-byte write\n3. [Another thread adds xattr, i_inline_size changes to 40]\n4. ext4_write_lock_xattr() acquires lock\n5. ext4_update_inline_data() uses stale i_inline_size = 60\n6. Attempts to write 50 bytes but only 40 bytes actually available\n7. BUG_ON() triggers\n\nFix this by recalculating i_inline_size via ext4_find_inline_data_nolock()\nimmediately after acquiring xattr_sem. This ensures ext4_update_inline_data()\nand ext4_create_inline_data() work with current values that are protected\nfrom concurrent modifications.\n\nThis is similar to commit a54c4613dac1 (\"ext4: fix race writing to an\ninline_data file while its xattrs are changing\") which fixed i_inline_off\nstaleness. This patch addresses the related i_inline_size staleness issue.","modified":"2026-04-02T13:03:28.380501Z","published":"2025-12-16T14:45:06.268Z","related":["SUSE-SU-2026:0278-1","SUSE-SU-2026:0281-1","SUSE-SU-2026:0315-1","SUSE-SU-2026:0473-1","SUSE-SU-2026:20207-1","SUSE-SU-2026:20220-1","SUSE-SU-2026:20228-1","SUSE-SU-2026:20477-1","SUSE-SU-2026:20498-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20876-1","openSUSE-SU-2025:15836-1","openSUSE-SU-2026:10301-1","openSUSE-SU-2026:20145-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68264.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1687a055a555347b002f406676a1aaae4668f242"},{"type":"WEB","url":"https://git.kernel.org/stable/c/210ac60a86a3ad2c76ae60e0dc71c34af6e7ea0b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43bf001f0fe4e59bba47c897505222f959f4a1cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54ab81ae5f218452e64470cd8a8139bb5880fe2b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/58df743faf21ceb1880f930aa5dd428e2a5e415d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/892e1cf17555735e9d021ab036c36bc7b58b0e3b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89c2c41f0974e530b2d032c3695095aa0559adb1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca43ea29b4c4d2764aec8a26cffcfb677a871e6e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68264.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68264"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"67cf5b09a46f72e048501b84996f2f77bc42e947"},{"fixed":"54ab81ae5f218452e64470cd8a8139bb5880fe2b"},{"fixed":"43bf001f0fe4e59bba47c897505222f959f4a1cc"},{"fixed":"89c2c41f0974e530b2d032c3695095aa0559adb1"},{"fixed":"1687a055a555347b002f406676a1aaae4668f242"},{"fixed":"210ac60a86a3ad2c76ae60e0dc71c34af6e7ea0b"},{"fixed":"ca43ea29b4c4d2764aec8a26cffcfb677a871e6e"},{"fixed":"58df743faf21ceb1880f930aa5dd428e2a5e415d"},{"fixed":"892e1cf17555735e9d021ab036c36bc7b58b0e3b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68264.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"5.10.248"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.198"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.120"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.62"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.17.12"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68264.json"}}],"schema_version":"1.7.5"}