{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-49880", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49880", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-05-01T14:10:27.947Z", "updatedAt": "2026-05-11T19:08:31.908Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ext4: fix warning in 'ext4_da_release_space'", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix warning in 'ext4_da_release_space'\n\nSyzkaller report issue as follows:\nEXT4-fs (loop0): Free/Dirty block details\nEXT4-fs (loop0): free_blocks=0\nEXT4-fs (loop0): dirty_blocks=0\nEXT4-fs (loop0): Block reservation details\nEXT4-fs (loop0): i_reserved_data_blocks=0\nEXT4-fs warning (device loop0): ext4_da_release_space:1527: ext4_da_release_space: ino 18, to_free 1 with only 0 reserved data blocks\n------------[ cut here ]------------\nWARNING: CPU: 0 PID: 92 at fs/ext4/inode.c:1528 ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1524\nModules linked in:\nCPU: 0 PID: 92 Comm: kworker/u4:4 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022\nWorkqueue: writeback wb_workfn (flush-7:0)\nRIP: 0010:ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1528\nRSP: 0018:ffffc900015f6c90 EFLAGS: 00010296\nRAX: 42215896cd52ea00 RBX: 0000000000000000 RCX: 42215896cd52ea00\nRDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000\nRBP: 1ffff1100e907d96 R08: ffffffff816aa79d R09: fffff520002bece5\nR10: fffff520002bece5 R11: 1ffff920002bece4 R12: ffff888021fd2000\nR13: ffff88807483ecb0 R14: 0000000000000001 R15: ffff88807483e740\nFS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00005555569ba628 CR3: 000000000c88e000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \n ext4_es_remove_extent+0x1ab/0x260 fs/ext4/extents_status.c:1461\n mpage_release_unused_pages+0x24d/0xef0 fs/ext4/inode.c:1589\n ext4_writepages+0x12eb/0x3be0 fs/ext4/inode.c:2852\n do_writepages+0x3c3/0x680 mm/page-writeback.c:2469\n __writeback_single_inode+0xd1/0x670 fs/fs-writeback.c:1587\n writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1870\n wb_writeback+0x41f/0x7b0 fs/fs-writeback.c:2044\n wb_do_writeback fs/fs-writeback.c:2187 [inline]\n wb_workfn+0x3cb/0xef0 fs/fs-writeback.c:2227\n process_one_work+0x877/0xdb0 kernel/workqueue.c:2289\n worker_thread+0xb14/0x1330 kernel/workqueue.c:2436\n kthread+0x266/0x300 kernel/kthread.c:376\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n \n\nAbove issue may happens as follows:\next4_da_write_begin\n ext4_create_inline_data\n ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);\n ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);\n__ext4_ioctl\n ext4_ext_migrate -> will lead to eh->eh_entries not zero, and set extent flag\next4_da_write_begin\n ext4_da_convert_inline_data_to_extent\n ext4_da_write_inline_data_begin\n ext4_da_map_blocks\n ext4_insert_delayed_block\n\t if (!ext4_es_scan_clu(inode, &ext4_es_is_delonly, lblk))\n\t if (!ext4_es_scan_clu(inode, &ext4_es_is_mapped, lblk))\n\t ext4_clu_mapped(inode, EXT4_B2C(sbi, lblk)); -> will return 1\n\t allocated = true;\n ext4_es_insert_delayed_block(inode, lblk, allocated);\next4_writepages\n mpage_map_and_submit_extent(handle, &mpd, &give_up_on_write); -> return -ENOSPC\n mpage_release_unused_pages(&mpd, give_up_on_write); -> give_up_on_write == 1\n ext4_es_remove_extent\n ext4_da_release_space(inode, reserved);\n if (unlikely(to_free > ei->i_reserved_data_blocks))\n\t -> to_free == 1 but ei->i_reserved_data_blocks == 0\n\t -> then trigger warning as above\n\nTo solve above issue, forbid inode do migrate which has inline data.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "67cf5b09a46f72e048501b84996f2f77bc42e947", "status": "affected", "versionType": "git", "lessThan": "0de5ee103747fd3a24f1c010c79caabe35e8f0bb" }, { "version": "67cf5b09a46f72e048501b84996f2f77bc42e947", "status": "affected", "versionType": "git", "lessThan": "c3bf1e95cfa7d950dc3c064d0c2e3d06b427bc63" }, { "version": "67cf5b09a46f72e048501b84996f2f77bc42e947", "status": "affected", "versionType": "git", "lessThan": "890d738f569fa9412b70ba09f15407f17a52da20" }, { "version": "67cf5b09a46f72e048501b84996f2f77bc42e947", "status": "affected", "versionType": "git", "lessThan": "72743d5598b9096950bbfd6a9b7f173d156eea97" }, { "version": "67cf5b09a46f72e048501b84996f2f77bc42e947", "status": "affected", "versionType": "git", "lessThan": "5370b965b7a945bb8f48b9ee23d83a76a947902e" }, { "version": "67cf5b09a46f72e048501b84996f2f77bc42e947", "status": "affected", "versionType": "git", "lessThan": "0a43c015e98121c91a76154edf42280ce1a8a883" }, { "version": "67cf5b09a46f72e048501b84996f2f77bc42e947", "status": "affected", "versionType": "git", "lessThan": "89bee03d2fb8c54119b38ac6c24e7d60fae036b6" }, { "version": "67cf5b09a46f72e048501b84996f2f77bc42e947", "status": "affected", "versionType": "git", "lessThan": "1b8f787ef547230a3249bcf897221ef0cc78481b" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.8", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.8" }, { "version": "4.9.333", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.299", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.265", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.224", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.154", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.78", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.0.8", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }