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CVE-2024-26878

quota: Fix potential NULL pointer dereference

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.311, 5.4.273, 5.10.214, 5.15.153, 6.1.83, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: quota: Fix potential NULL pointer dereference Below race may cause NULL pointer dereference P1 P2 dquot_free_inode quota_off drop_dquot_ref remove_dquot_ref dquots = i_dquot(inode) dquots = i_dquot(inode) srcu_read_lock dquots[cnt]) != NULL (1) dquots[type] = NULL (2) spin_lock(&dquots[cnt]->dq_dqb_lock) (3) .... If dquot_free_inode(or other routines) checks inode's quota pointers (1) before quota_off sets it to NULL(2) and use it (3) after that, NULL pointer dereference will be triggered. So let's fix it by using a temporary pointer to avoid this issue.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in 8514899c1a4edf802f03c408db901063aa3f05a1; From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in 49669f8e7eb053f91d239df7b1bfb4500255a9d0; From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in 61380537aa6dd32d8a723d98b8f1bd1b11d8fee0; From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in 1ca72a3de915f87232c9a4cb9bebbd3af8ed3e25; From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in 7f9e833fc0f9b47be503af012eb5903086939754; From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in 40a673b4b07efd6f74ff3ab60f38b26aa91ee5d5; From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in f2649d98aa9ca8623149b3cb8df00c944f5655c7; From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in 6afc9f4434fa8063aa768c2bf5bf98583aee0877; From 7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac · fixed in d0aa72604fbd80c8aabb46eda00535ed35570f1f

  • Linux Linux

    4.14

  • KernelLinux

    From 4.14.0 · fixed in 4.19.311; From 4.20.0 · fixed in 5.4.273; From 5.5.0 · fixed in 5.10.214; From 5.11.0 · fixed in 5.15.153; From 5.16.0 · fixed in 6.1.83; From 6.2.0 · fixed in 6.6.23; From 6.7.0 · fixed in 6.7.11; From 6.8.0 · fixed in 6.8.2

References 9

git.kernel.org