{"id":"CVE-2024-26878","state":"PUBLISHED","title":"quota: Fix potential NULL pointer dereference","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nquota: Fix potential NULL pointer dereference\n\nBelow race may cause NULL pointer dereference\n\nP1\t\t\t\t\tP2\ndquot_free_inode\t\t\tquota_off\n\t\t\t\t\t  drop_dquot_ref\n\t\t\t\t\t   remove_dquot_ref\n\t\t\t\t\t   dquots = i_dquot(inode)\n  dquots = i_dquot(inode)\n  srcu_read_lock\n  dquots[cnt]) != NULL (1)\n\t\t\t\t\t     dquots[type] = NULL (2)\n  spin_lock(&dquots[cnt]->dq_dqb_lock) (3)\n   ....\n\nIf dquot_free_inode(or other routines) checks inode's quota pointers (1)\nbefore quota_off sets it to NULL(2) and use it (3) after that, NULL pointer\ndereference will be triggered.\n\nSo let's fix it by using a temporary pointer to avoid this issue.","publishedAt":"2024-04-17T10:27:35.838Z","updatedAt":"2026-10-15T00:39:00.741Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"8514899c1a4edf802f03c408db901063aa3f05a1","versionType":"git"},{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"49669f8e7eb053f91d239df7b1bfb4500255a9d0","versionType":"git"},{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"61380537aa6dd32d8a723d98b8f1bd1b11d8fee0","versionType":"git"},{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"1ca72a3de915f87232c9a4cb9bebbd3af8ed3e25","versionType":"git"},{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"7f9e833fc0f9b47be503af012eb5903086939754","versionType":"git"},{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"40a673b4b07efd6f74ff3ab60f38b26aa91ee5d5","versionType":"git"},{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"f2649d98aa9ca8623149b3cb8df00c944f5655c7","versionType":"git"},{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"6afc9f4434fa8063aa768c2bf5bf98583aee0877","versionType":"git"},{"version":"7b9ca4c61bc278b771fb57d6290a31ab1fc7fdac","status":"affected","lessThan":"d0aa72604fbd80c8aabb46eda00535ed35570f1f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/quota/dquot.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"4.19.311","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.273","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.214","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.153","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.83","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.23","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.11","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8.2","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/quota/dquot.c"]}],"references":["https://git.kernel.org/stable/c/8514899c1a4edf802f03c408db901063aa3f05a1","https://git.kernel.org/stable/c/49669f8e7eb053f91d239df7b1bfb4500255a9d0","https://git.kernel.org/stable/c/61380537aa6dd32d8a723d98b8f1bd1b11d8fee0","https://git.kernel.org/stable/c/1ca72a3de915f87232c9a4cb9bebbd3af8ed3e25","https://git.kernel.org/stable/c/7f9e833fc0f9b47be503af012eb5903086939754","https://git.kernel.org/stable/c/40a673b4b07efd6f74ff3ab60f38b26aa91ee5d5","https://git.kernel.org/stable/c/f2649d98aa9ca8623149b3cb8df00c944f5655c7","https://git.kernel.org/stable/c/6afc9f4434fa8063aa768c2bf5bf98583aee0877","https://git.kernel.org/stable/c/d0aa72604fbd80c8aabb46eda00535ed35570f1f","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html","https://cert-portal.siemens.com/productcert/html/ssa-398330.html","https://cert-portal.siemens.com/productcert/html/ssa-265688.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:10.607Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/26xxx/CVE-2024-26878.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-26878","state":"PUBLISHED","datePublished":"2024-04-17T10:27:35.838Z","dateUpdated":"2026-10-15T00:39:00.741Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-19T14:20:24.185Z"},"containers":{"cna":{"title":"quota: Fix potential NULL pointer dereference","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nquota: Fix potential NULL pointer dereference\n\nBelow race may cause NULL pointer dereference\n\nP1\t\t\t\t\tP2\ndquot_free_inode\t\t\tquota_off\n\t\t\t\t\t  drop_dquot_ref\n\t\t\t\t\t   remove_dquot_ref\n\t\t\t\t\t   dquots = i_dquot(inode)\n  dquots = i_dquot(inode)\n  srcu_read_lock\n  dquots[cnt]) != NULL (1)\n\t\t\t\t\t     dquots[type] = NULL (2)\n  spin_lock(&dquots[cnt]->dq_dqb_lock) (3)\n   ....\n\nIf dquot_free_inode(or other routines) checks inode's quota pointers (1)\nbefore quota_off sets it to NULL(2) and use it (3) after that, NULL pointer\ndereference will be triggered.\n\nSo let's fix it by using a temporary pointer to avoid this 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