{"id":"CVE-2023-54069","state":"PUBLISHED","title":"ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix BUG in ext4_mb_new_inode_pa() due to overflow\n\nWhen we calculate the end position of ext4_free_extent, this position may\nbe exactly where ext4_lblk_t (i.e. uint) overflows. For example, if\nac_g_ex.fe_logical is 4294965248 and ac_orig_goal_len is 2048, then the\ncomputed end is 0x100000000, which is 0. If ac->ac_o_ex.fe_logical is not\nthe first case of adjusting the best extent, that is, new_bex_end > 0, the\nfollowing BUG_ON will be triggered:\n\n=========================================================\nkernel BUG at fs/ext4/mballoc.c:5116!\ninvalid opcode: 0000 [#1] PREEMPT SMP PTI\nCPU: 3 PID: 673 Comm: xfs_io Tainted: G E 6.5.0-rc1+ #279\nRIP: 0010:ext4_mb_new_inode_pa+0xc5/0x430\nCall Trace:\n <TASK>\n ext4_mb_use_best_found+0x203/0x2f0\n ext4_mb_try_best_found+0x163/0x240\n ext4_mb_regular_allocator+0x158/0x1550\n ext4_mb_new_blocks+0x86a/0xe10\n ext4_ext_map_blocks+0xb0c/0x13a0\n ext4_map_blocks+0x2cd/0x8f0\n ext4_iomap_begin+0x27b/0x400\n iomap_iter+0x222/0x3d0\n __iomap_dio_rw+0x243/0xcb0\n iomap_dio_rw+0x16/0x80\n=========================================================\n\nA simple reproducer demonstrating the problem:\n\n\tmkfs.ext4 -F /dev/sda -b 4096 100M\n\tmount /dev/sda /tmp/test\n\tfallocate -l1M /tmp/test/tmp\n\tfallocate -l10M /tmp/test/file\n\tfallocate -i -o 1M -l16777203M /tmp/test/file\n\tfsstress -d /tmp/test -l 0 -n 100000 -p 8 &\n\tsleep 10 && killall -9 fsstress\n\trm -f /tmp/test/tmp\n\txfs_io -c \"open -ad /tmp/test/file\" -c \"pwrite -S 0xff 0 8192\"\n\nWe simply refactor the logic for adjusting the best extent by adding\na temporary ext4_free_extent ex and use extent_logical_end() to avoid\noverflow, which also simplifies the code.","publishedAt":"2025-12-24T12:23:13.504Z","updatedAt":"2026-05-23T15:32:21.855Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8659c5f4ffaacbe932849b98462c3d635b4eacea","status":"affected","lessThan":"83ecffd40c65844a73c2e93d7c841455786605ac","versionType":"git"},{"version":"fc7237e191b99f88e859316fab2b06c2c26c8344","status":"affected","lessThan":"58fe961c606c446f5612f6897827b1cac42c2e89","versionType":"git"},{"version":"613f6cde5ebb005a37fda117cdda7b4126170c13","status":"affected","lessThan":"f2c3a3aa6f11ad9878dbc3a067b0633e07b586c1","versionType":"git"},{"version":"9d4430b7f862ce8835ca4e054b6916d15c8e0862","status":"affected","lessThan":"fcefddf3a151b2c416b20120c06bb1ba9ad676fb","versionType":"git"},{"version":"93cdf49f6eca5e23f6546b8f28457b2e6a6961d9","status":"affected","lessThan":"b7e9ec38b6a0beb5a49cd1e76be0a9a07c218e90","versionType":"git"},{"version":"93cdf49f6eca5e23f6546b8f28457b2e6a6961d9","status":"affected","lessThan":"bc056e7163ac7db945366de219745cf94f32a3e6","versionType":"git"},{"version":"46772ab99409cc72241227dd8f5295f358233fda","status":"affected","versionType":"git"},{"version":"25a60b4533268477920faaeebd99e7e69c0735cd","status":"affected","versionType":"git"},{"version":"cec4ef62b36b04e0bc8905732adab091f4bc1cfd","status":"affected","versionType":"git"},{"version":"5.4.244","status":"affected","lessThan":"5.4.260","versionType":"semver"},{"version":"5.10.181","status":"affected","lessThan":"5.10.200","versionType":"semver"},{"version":"5.15.113","status":"affected","lessThan":"5.15.138","versionType":"semver"},{"version":"6.1.30","status":"affected","lessThan":"6.1.61","versionType":"semver"},{"version":"4.14.316","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.284","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"6.3.4","status":"affected","lessThan":"6.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"5.4.260","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.200","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.138","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.61","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.5","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"]}],"references":["https://git.kernel.org/stable/c/83ecffd40c65844a73c2e93d7c841455786605ac","https://git.kernel.org/stable/c/58fe961c606c446f5612f6897827b1cac42c2e89","https://git.kernel.org/stable/c/f2c3a3aa6f11ad9878dbc3a067b0633e07b586c1","https://git.kernel.org/stable/c/fcefddf3a151b2c416b20120c06bb1ba9ad676fb","https://git.kernel.org/stable/c/b7e9ec38b6a0beb5a49cd1e76be0a9a07c218e90","https://git.kernel.org/stable/c/bc056e7163ac7db945366de219745cf94f32a3e6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:42.242Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/54xxx/CVE-2023-54069.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-54069","state":"PUBLISHED","datePublished":"2025-12-24T12:23:13.504Z","dateUpdated":"2026-05-23T15:32:21.855Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T12:21:05.093Z"},"containers":{"cna":{"title":"ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix BUG in ext4_mb_new_inode_pa() due to overflow\n\nWhen we calculate the end position of ext4_free_extent, this position may\nbe exactly where ext4_lblk_t (i.e. uint) overflows. For example, if\nac_g_ex.fe_logical is 4294965248 and ac_orig_goal_len is 2048, then the\ncomputed end is 0x100000000, which is 0. If ac->ac_o_ex.fe_logical is not\nthe first case of adjusting the best extent, that is, new_bex_end > 0, the\nfollowing BUG_ON will be triggered:\n\n=========================================================\nkernel BUG at fs/ext4/mballoc.c:5116!\ninvalid opcode: 0000 [#1] PREEMPT SMP PTI\nCPU: 3 PID: 673 Comm: xfs_io Tainted: G E 6.5.0-rc1+ #279\nRIP: 0010:ext4_mb_new_inode_pa+0xc5/0x430\nCall Trace:\n <TASK>\n ext4_mb_use_best_found+0x203/0x2f0\n ext4_mb_try_best_found+0x163/0x240\n ext4_mb_regular_allocator+0x158/0x1550\n ext4_mb_new_blocks+0x86a/0xe10\n ext4_ext_map_blocks+0xb0c/0x13a0\n ext4_map_blocks+0x2cd/0x8f0\n ext4_iomap_begin+0x27b/0x400\n iomap_iter+0x222/0x3d0\n __iomap_dio_rw+0x243/0xcb0\n iomap_dio_rw+0x16/0x80\n=========================================================\n\nA simple reproducer demonstrating the problem:\n\n\tmkfs.ext4 -F /dev/sda -b 4096 100M\n\tmount /dev/sda /tmp/test\n\tfallocate -l1M /tmp/test/tmp\n\tfallocate -l10M /tmp/test/file\n\tfallocate -i -o 1M -l16777203M /tmp/test/file\n\tfsstress -d /tmp/test -l 0 -n 100000 -p 8 &\n\tsleep 10 && killall -9 fsstress\n\trm -f /tmp/test/tmp\n\txfs_io -c \"open -ad /tmp/test/file\" -c \"pwrite -S 0xff 0 8192\"\n\nWe simply refactor the logic for adjusting the best extent by adding\na temporary ext4_free_extent ex and use extent_logical_end() to avoid\noverflow, which also simplifies the code."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8659c5f4ffaacbe932849b98462c3d635b4eacea","status":"affected","lessThan":"83ecffd40c65844a73c2e93d7c841455786605ac","versionType":"git"},{"version":"fc7237e191b99f88e859316fab2b06c2c26c8344","status":"affected","lessThan":"58fe961c606c446f5612f6897827b1cac42c2e89","versionType":"git"},{"version":"613f6cde5ebb005a37fda117cdda7b4126170c13","status":"affected","lessThan":"f2c3a3aa6f11ad9878dbc3a067b0633e07b586c1","versionType":"git"},{"version":"9d4430b7f862ce8835ca4e054b6916d15c8e0862","status":"affected","lessThan":"fcefddf3a151b2c416b20120c06bb1ba9ad676fb","versionType":"git"},{"version":"93cdf49f6eca5e23f6546b8f28457b2e6a6961d9","status":"affected","lessThan":"b7e9ec38b6a0beb5a49cd1e76be0a9a07c218e90","versionType":"git"},{"version":"93cdf49f6eca5e23f6546b8f28457b2e6a6961d9","status":"affected","lessThan":"bc056e7163ac7db945366de219745cf94f32a3e6","versionType":"git"},{"version":"46772ab99409cc72241227dd8f5295f358233fda","status":"affected","versionType":"git"},{"version":"25a60b4533268477920faaeebd99e7e69c0735cd","status":"affected","versionType":"git"},{"version":"cec4ef62b36b04e0bc8905732adab091f4bc1cfd","status":"affected","versionType":"git"},{"version":"5.4.244","status":"affected","lessThan":"5.4.260","versionType":"semver"},{"version":"5.10.181","status":"affected","lessThan":"5.10.200","versionType":"semver"},{"version":"5.15.113","status":"affected","lessThan":"5.15.138","versionType":"semver"},{"version":"6.1.30","status":"affected","lessThan":"6.1.61","versionType":"semver"},{"version":"4.14.316","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.284","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"6.3.4","status":"affected","lessThan":"6.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"5.4.260","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.200","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.138","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.61","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.5","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/mballoc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/83ecffd40c65844a73c2e93d7c841455786605ac"},{"url":"https://git.kernel.org/stable/c/58fe961c606c446f5612f6897827b1cac42c2e89"},{"url":"https://git.kernel.org/stable/c/f2c3a3aa6f11ad9878dbc3a067b0633e07b586c1"},{"url":"https://git.kernel.org/stable/c/fcefddf3a151b2c416b20120c06bb1ba9ad676fb"},{"url":"https://git.kernel.org/stable/c/b7e9ec38b6a0beb5a49cd1e76be0a9a07c218e90"},{"url":"https://git.kernel.org/stable/c/bc056e7163ac7db945366de219745cf94f32a3e6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T15:32:21.855Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.244","versionEndExcluding":"5.4.260"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.181","versionEndExcluding":"5.10.200"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.113","versionEndExcluding":"5.15.138"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.30","versionEndExcluding":"6.1.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.5.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.316"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.284"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}