CVE-2025-68264ext4: refresh inline data size before write operations
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In the Linux kernel, the following vulnerability has been resolved: ext4: refresh inline data size before write operations The cached ei->i_inline_size can become stale between the initial size check and when ext4_update_inline_data()/ext4_create_inline_data() use it. Although ext4_get_max_inline_size() reads the correct value at the time of the check, concurrent xattr operations can modify i_inline_size before ext4_write_lock_xattr() is acquired. This causes ext4_update_inline_data() and ext4_create_inline_data() to work with stale capacity values, leading to a BUG_ON() crash in ext4_write_inline_data(): kernel BUG at fs/ext4/inline.c:1331! BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); The race window: 1. ext4_get_max_inline_size() reads i_inline_size = 60 (correct) 2. Size check passes for 50-byte write 3. [Another thread adds xattr, i_inline_size changes to 40] 4. ext4_write_lock_xattr() acquires lock 5. ext4_update_inline_data() uses stale i_inline_size = 60 6. Attempts to write 50 bytes but only 40 bytes actually available 7. BUG_ON() triggers Fix this by recalculating i_inline_size via ext4_find_inline_data_nolock() immediately after acquiring xattr_sem. This ensures ext4_update_inline_data() and ext4_create_inline_data() work with current values that are protected from concurrent modifications. This is similar to commit a54c4613dac1 ("ext4: fix race writing to an inline_data file while its xattrs are changing") which fixed i_inline_off staleness. This patch addresses the related i_inline_size staleness issue.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 67cf5b09a46f72e048501b84996f2f77bc42e947 builds before 54ab81ae5f218452e64470cd8a8139bb5880fe2b; 67cf5b09a46f72e048501b84996f2f77bc42e947 builds before 43bf001f0fe4e59bba47c897505222f959f4a1cc; from 67cf5b09a46f72e048501b84996f2f77bc42e947 before 89c2c41f0974e530b2d032c3695095aa0559adb1; from 67cf5b09a46f72e048501b84996f2f77bc42e947 before 1687a055a555347b002f406676a1aaae4668f242; from 67cf5b09a46f72e048501b84996f2f77bc42e947 before 210ac60a86a3ad2c76ae60e0dc71c34af6e7ea0b; from 67cf5b09a46f72e048501b84996f2f77bc42e947 before ca43ea29b4c4d2764aec8a26cffcfb677a871e6e; 67cf5b09a46f72e048501b84996f2f77bc42e947 builds before 58df743faf21ceb1880f930aa5dd428e2a5e415d; from 67cf5b09a46f72e048501b84996f2f77bc42e947 before 892e1cf17555735e9d021ab036c36bc7b58b0e3b | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
References
- https://git.kernel.org/stable/c/54ab81ae5f218452e64470cd8a8139bb5880fe2b
- https://git.kernel.org/stable/c/43bf001f0fe4e59bba47c897505222f959f4a1cc
- https://git.kernel.org/stable/c/89c2c41f0974e530b2d032c3695095aa0559adb1
- https://git.kernel.org/stable/c/1687a055a555347b002f406676a1aaae4668f242
- https://git.kernel.org/stable/c/210ac60a86a3ad2c76ae60e0dc71c34af6e7ea0b
- https://git.kernel.org/stable/c/ca43ea29b4c4d2764aec8a26cffcfb677a871e6e
- https://git.kernel.org/stable/c/58df743faf21ceb1880f930aa5dd428e2a5e415d
- https://git.kernel.org/stable/c/892e1cf17555735e9d021ab036c36bc7b58b0e3b
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.