ext4: fix null-ptr-deref in ext4_write_info (Linux Linux)
En bref
- Source
- NVD
- EPSS
- EPSS 0.16 % · centile 6 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- Linux
- Statut NVD
- Modified
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix null-ptr-deref in ext4_write_info I caught a null-ptr-deref bug as follows: ================================================================== KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 1 PID: 1589 Comm: umount Not tainted 5.10.0-02219-dirty #339 RIP: 0010:ext4_write_info+0x53/0x1b0 [...] Call Trace: dquot_writeback_dquots+0x341/0x9a0 ext4_sync_fs+0x19e/0x800 __sync_filesystem+0x83/0x100 sync_filesystem+0x89/0xf0 generic_shutdown_super+0x79/0x3e0 kill_block_super+0xa1/0x110 deactivate_locked_super+0xac/0x130 deactivate_super+0xb6/0xd0 cleanup_mnt+0x289/0x400 __cleanup_mnt+0x16/0x20 task_work_run+0x11c/0x1c0 exit_to_user_mode_prepare+0x203/0x210 syscall_exit_to_user_mode+0x5b/0x3a0 do_syscall_64+0x59/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ================================================================== Above issue may happen as follows: ------------------------------------- exit_to_user_mode_prepare task_work_run __cleanup_mnt cleanup_mnt deactivate_super deactivate_locked_super kill_block_super generic_shutdown_super shrink_dcache_for_umount dentry = sb->s_root sb->s_root = NULL <--- Here set NULL sync_filesystem __sync_filesystem sb->s_op->sync_fs > ext4_sync_fs dquot_writeback_dquots sb->dq_op->write_info > ext4_write_info ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2) d_inode(sb->s_root) s_root->d_inode <--- Null pointer dereference To solve this problem, we use ext4_journal_start_sb directly to avoid s_root being used.
Faiblesses (CWE)
- CWE-476 — Déréférencement de pointeur nul
Références
- https://git.kernel.org/stable/c/dc451578446afd03c0c21913993c08898a691435
- https://git.kernel.org/stable/c/f4b5ff0b794aa94afac7269c494550ca2f66511b
- https://git.kernel.org/stable/c/947264e00c46de19a016fd81218118c708fed2f3
- https://git.kernel.org/stable/c/3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4
- https://git.kernel.org/stable/c/f34ab95162763cd7352f46df169296eec28b688d
- https://git.kernel.org/stable/c/533c60a0b97cee5daab376933f486207e6680fb7
- https://git.kernel.org/stable/c/4a657319cfabd6199fd0b7b65bbebf6ded7a11c1
- https://git.kernel.org/stable/c/bb420e8afc854d2a1caaa23a0c129839acfb7888
- https://git.kernel.org/stable/c/f9c1f248607d5546075d3f731e7607d5571f2b60
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
Références européennes
- ENISA EUVD · EUVD-2022-55618
- GCVE · GCVE-0-2022-50344
Avis du CERT-FR
- CERTFR-2025-AVI-0921 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0895 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*< 4.9.331cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.10 < 4.14.296cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.15 < 4.19.262cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.20 < 5.4.220cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.5 < 5.10.150cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.75cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 5.19.17cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.0 < 6.0.3
Produits affectés
| Produit | Versions |
|---|---|
| Linux · Linux | affected a1177825719ccef3f76ef39bbfd5ebb6087d53c7 < dc451578446afd03c0c21913993c08898a691435 ; affected a1177825719ccef3f76ef39bbfd5ebb6087d53c7 < f4b5ff0b794aa94afac7269c494550ca2f66511b ; affected a1177825719ccef3f76ef39bbfd5ebb6087d53c7 < 947264e00c46de19a016fd81218118c708fed2f3 ; affected a1177825719ccef3f76ef39bbfd5ebb6087d53c7 < 3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4 ; affected a1177825719ccef3f76ef39bbfd5ebb6087d53c7 < f34ab95162763cd7352f46df169296eec28b688d ; affected a1177825719ccef3f76ef39bbfd5ebb6087d53c7 < 533c60a0b97cee5daab376933f486207e6680fb7 |
| Linux · Linux | affected 3.6 ; unaffected 0 < 3.6 ; unaffected 4.9.331 ≤ 4.9.* ; unaffected 4.14.296 ≤ 4.14.* ; unaffected 4.19.262 ≤ 4.19.* ; unaffected 5.4.220 ≤ 5.4.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |