{ "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-2024-49884", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-49884", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-10-21T18:01:21.517Z", "updatedAt": "2026-10-15T00:53:34.802Z", "importedAt": "2026-10-24T01:57:16.009Z", "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 slab-use-after-free in ext4_split_extent_at()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix slab-use-after-free in ext4_split_extent_at()\n\nWe hit the following use-after-free:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0\nRead of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40\nCPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724\nCall Trace:\n \n kasan_report+0x93/0xc0\n ext4_split_extent_at+0xba8/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nAllocated by task 40:\n __kmalloc_noprof+0x1ac/0x480\n ext4_find_extent+0xf3b/0x1e70\n ext4_ext_map_blocks+0x188/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nFreed by task 40:\n kfree+0xf1/0x2b0\n ext4_find_extent+0xa71/0x1e70\n ext4_ext_insert_extent+0xa22/0x3260\n ext4_split_extent_at+0x3ef/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n==================================================================\n\nThe flow of issue triggering is as follows:\n\next4_split_extent_at\n path = *ppath\n ext4_ext_insert_extent(ppath)\n ext4_ext_create_new_leaf(ppath)\n ext4_find_extent(orig_path)\n path = *orig_path\n read_extent_tree_block\n // return -ENOMEM or -EIO\n ext4_free_ext_path(path)\n kfree(path)\n *orig_path = NULL\n a. If err is -ENOMEM:\n ext4_ext_dirty(path + path->p_depth)\n // path use-after-free !!!\n b. If err is -EIO and we have EXT_DEBUG defined:\n ext4_ext_show_leaf(path)\n eh = path[depth].p_hdr\n // path also use-after-free !!!\n\nSo when trying to zeroout or fix the extent length, call ext4_find_extent()\nto update the path.\n\nIn addition we use *ppath directly as an ext4_ext_show_leaf() input to\navoid possible use-after-free when EXT_DEBUG is defined, and to avoid\nunnecessary path updates.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "393a46f60ea4f249dc9d496d4eb2d542f5e11ade" }, { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "448100a29395b0c8b4c42967155849fe0fbe808f" }, { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "e52f933598b781d291b9297e39c463536da0e185" }, { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "cafcc1bd62934547c76abf46c6d0d54f135006fe" }, { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "a5401d4c3e2a3d25643c567d26e6de327774a2c9" }, { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "8fe117790b37c84c651e2bad9efc0e7fda73c0e3" }, { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "5d949ea75bb529ea6342e83465938a3b0ac51238" }, { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "915ac3630488af0ca194dc63b86d99802b4f6e18" }, { "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "status": "affected", "versionType": "git", "lessThan": "c26ab35702f8cd0cdc78f96aa5856bfb77be798f" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.18", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.18" }, { "version": "4.19.323", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.290", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.227", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.168", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.113", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.55", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.10.14", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.10.*" }, { "version": "6.11.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.11.*" }, { "version": "6.12", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }