ext4: refresh inline data size before write operations
Summary
| CVE | CVE-2025-68264 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-12-16 15:15:55 UTC |
| Updated | 2026-07-14 13:17:57 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.001800000 probability, percentile 0.076610000 (date 2026-07-14)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 67cf5b09a46f72e048501b84996f2f77bc42e947 54ab81ae5f218452e64470cd8a8139bb5880fe2b git | Not specified |
| CNA | Linux | Linux | affected 67cf5b09a46f72e048501b84996f2f77bc42e947 43bf001f0fe4e59bba47c897505222f959f4a1cc git | Not specified |
| CNA | Linux | Linux | affected 67cf5b09a46f72e048501b84996f2f77bc42e947 89c2c41f0974e530b2d032c3695095aa0559adb1 git | Not specified |
| CNA | Linux | Linux | affected 67cf5b09a46f72e048501b84996f2f77bc42e947 1687a055a555347b002f406676a1aaae4668f242 git | Not specified |
| CNA | Linux | Linux | affected 67cf5b09a46f72e048501b84996f2f77bc42e947 210ac60a86a3ad2c76ae60e0dc71c34af6e7ea0b git | Not specified |
| CNA | Linux | Linux | affected 67cf5b09a46f72e048501b84996f2f77bc42e947 ca43ea29b4c4d2764aec8a26cffcfb677a871e6e git | Not specified |
| CNA | Linux | Linux | affected 67cf5b09a46f72e048501b84996f2f77bc42e947 58df743faf21ceb1880f930aa5dd428e2a5e415d git | Not specified |
| CNA | Linux | Linux | affected 67cf5b09a46f72e048501b84996f2f77bc42e947 892e1cf17555735e9d021ab036c36bc7b58b0e3b git | Not specified |
| CNA | Linux | Linux | affected 3.8 | Not specified |
| CNA | Linux | Linux | unaffected 3.8 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.248 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.198 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.160 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.120 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.62 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.17.12 6.17.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.1 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19 * original_commit_for_fix | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/58df743faf21ceb1880f930aa5dd428e2a5e415d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/210ac60a86a3ad2c76ae60e0dc71c34af6e7ea0b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ca43ea29b4c4d2764aec8a26cffcfb677a871e6e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/89c2c41f0974e530b2d032c3695095aa0559adb1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/54ab81ae5f218452e64470cd8a8139bb5880fe2b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/43bf001f0fe4e59bba47c897505222f959f4a1cc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| cert-portal.siemens.com/productcert/html/ssa-019113.html | 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | cert-portal.siemens.com | |
| git.kernel.org/stable/c/892e1cf17555735e9d021ab036c36bc7b58b0e3b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1687a055a555347b002f406676a1aaae4668f242 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.