{"id":"CVE-2024-46840","state":"PUBLISHED","title":"btrfs: clean up our handling of refs == 0 in snapshot delete","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: clean up our handling of refs == 0 in snapshot delete\n\nIn reada we BUG_ON(refs == 0), which could be unkind since we aren't\nholding a lock on the extent leaf and thus could get a transient\nincorrect answer.  In walk_down_proc we also BUG_ON(refs == 0), which\ncould happen if we have extent tree corruption.  Change that to return\n-EUCLEAN.  In do_walk_down() we catch this case and handle it correctly,\nhowever we return -EIO, which -EUCLEAN is a more appropriate error code.\nFinally in walk_up_proc we have the same BUG_ON(refs == 0), so convert\nthat to proper error handling.  Also adjust the error message so we can\nactually do something with the information.","publishedAt":"2024-09-27T12:39:34.998Z","updatedAt":"2026-05-11T20:37:33.572Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"c847b28a799733b04574060ab9d00f215970627d","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"71291aa7246645ef622621934d2067400380645e","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"c60676b81fab456b672796830f6d8057058f029c","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"728d4d045b628e006b48a448f3326a7194c88d32","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"9cc887ac24b7a0598f4042ae9af6b9a33072f75b","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"7d1df13bf078ffebfedd361d714ff6cee1ff01b9","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"03804641ec2d0da4fa088ad21c88e703d151ce16","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"b8ccef048354074a548f108e51d0557d6adfd3a3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/extent-tree.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.31","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.31","versionType":"semver"},{"version":"4.19.322","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.284","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.226","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.167","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.110","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.51","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.10.10","status":"unaffected","lessThanOrEqual":"6.10.*","versionType":"semver"},{"version":"6.11","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/extent-tree.c"]}],"references":["https://git.kernel.org/stable/c/c847b28a799733b04574060ab9d00f215970627d","https://git.kernel.org/stable/c/71291aa7246645ef622621934d2067400380645e","https://git.kernel.org/stable/c/c60676b81fab456b672796830f6d8057058f029c","https://git.kernel.org/stable/c/728d4d045b628e006b48a448f3326a7194c88d32","https://git.kernel.org/stable/c/9cc887ac24b7a0598f4042ae9af6b9a33072f75b","https://git.kernel.org/stable/c/7d1df13bf078ffebfedd361d714ff6cee1ff01b9","https://git.kernel.org/stable/c/03804641ec2d0da4fa088ad21c88e703d151ce16","https://git.kernel.org/stable/c/b8ccef048354074a548f108e51d0557d6adfd3a3","https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html","https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:47.831Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/46xxx/CVE-2024-46840.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-46840","state":"PUBLISHED","datePublished":"2024-09-27T12:39:34.998Z","dateUpdated":"2026-05-11T20:37:33.572Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-09-11T15:12:18.288Z"},"containers":{"cna":{"title":"btrfs: clean up our handling of refs == 0 in snapshot delete","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: clean up our handling of refs == 0 in snapshot delete\n\nIn reada we BUG_ON(refs == 0), which could be unkind since we aren't\nholding a lock on the extent leaf and thus could get a transient\nincorrect answer.  In walk_down_proc we also BUG_ON(refs == 0), which\ncould happen if we have extent tree corruption.  Change that to return\n-EUCLEAN.  In do_walk_down() we catch this case and handle it correctly,\nhowever we return -EIO, which -EUCLEAN is a more appropriate error code.\nFinally in walk_up_proc we have the same BUG_ON(refs == 0), so convert\nthat to proper error handling.  Also adjust the error message so we can\nactually do something with the information."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"c847b28a799733b04574060ab9d00f215970627d","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"71291aa7246645ef622621934d2067400380645e","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"c60676b81fab456b672796830f6d8057058f029c","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"728d4d045b628e006b48a448f3326a7194c88d32","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"9cc887ac24b7a0598f4042ae9af6b9a33072f75b","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"7d1df13bf078ffebfedd361d714ff6cee1ff01b9","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"03804641ec2d0da4fa088ad21c88e703d151ce16","versionType":"git"},{"version":"2c47e605a91dde6b0514f689645e7ab336c8592a","status":"affected","lessThan":"b8ccef048354074a548f108e51d0557d6adfd3a3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/extent-tree.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.31","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.31","versionType":"semver"},{"version":"4.19.322","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.284","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.226","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.167","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.110","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.51","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.10.10","status":"unaffected","lessThanOrEqual":"6.10.*","versionType":"semver"},{"version":"6.11","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/extent-tree.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c847b28a799733b04574060ab9d00f215970627d"},{"url":"https://git.kernel.org/stable/c/71291aa7246645ef622621934d2067400380645e"},{"url":"https://git.kernel.org/stable/c/c60676b81fab456b672796830f6d8057058f029c"},{"url":"https://git.kernel.org/stable/c/728d4d045b628e006b48a448f3326a7194c88d32"},{"url":"https://git.kernel.org/stable/c/9cc887ac24b7a0598f4042ae9af6b9a33072f75b"},{"url":"https://git.kernel.org/stable/c/7d1df13bf078ffebfedd361d714ff6cee1ff01b9"},{"url":"https://git.kernel.org/stable/c/03804641ec2d0da4fa088ad21c88e703d151ce16"},{"url":"https://git.kernel.org/stable/c/b8ccef048354074a548f108e51d0557d6adfd3a3"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:37:33.572Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"4.19.322"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.4.284"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.10.226"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.15.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.1.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.6.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.10.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.11"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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