{ "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-2024-49885", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-49885", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-10-21T18:01:22.186Z", "updatedAt": "2026-10-21T12:35:18.866Z", "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": "mm, slub: avoid zeroing kmalloc redzone", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm, slub: avoid zeroing kmalloc redzone\n\nSince commit 946fa0dbf2d8 (\"mm/slub: extend redzone check to extra\nallocated kmalloc space than requested\"), setting orig_size treats\nthe wasted space (object_size - orig_size) as a redzone. However with\ninit_on_free=1 we clear the full object->size, including the redzone.\n\nAdditionally we clear the object metadata, including the stored orig_size,\nmaking it zero, which makes check_object() treat the whole object as a\nredzone.\n\nThese issues lead to the following BUG report with \"slub_debug=FUZ\ninit_on_free=1\":\n\n[ 0.000000] =============================================================================\n[ 0.000000] BUG kmalloc-8 (Not tainted): kmalloc Redzone overwritten\n[ 0.000000] -----------------------------------------------------------------------------\n[ 0.000000]\n[ 0.000000] 0xffff000010032858-0xffff00001003285f @offset=2136. First byte 0x0 instead of 0xcc\n[ 0.000000] FIX kmalloc-8: Restoring kmalloc Redzone 0xffff000010032858-0xffff00001003285f=0xcc\n[ 0.000000] Slab 0xfffffdffc0400c80 objects=36 used=23 fp=0xffff000010032a18 flags=0x3fffe0000000200(workingset|node=0|zone=0|lastcpupid=0x1ffff)\n[ 0.000000] Object 0xffff000010032858 @offset=2136 fp=0xffff0000100328c8\n[ 0.000000]\n[ 0.000000] Redzone ffff000010032850: cc cc cc cc cc cc cc cc ........\n[ 0.000000] Object ffff000010032858: cc cc cc cc cc cc cc cc ........\n[ 0.000000] Redzone ffff000010032860: cc cc cc cc cc cc cc cc ........\n[ 0.000000] Padding ffff0000100328b4: 00 00 00 00 00 00 00 00 00 00 00 00 ............\n[ 0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc3-next-20240814-00004-g61844c55c3f4 #144\n[ 0.000000] Hardware name: NXP i.MX95 19X19 board (DT)\n[ 0.000000] Call trace:\n[ 0.000000] dump_backtrace+0x90/0xe8\n[ 0.000000] show_stack+0x18/0x24\n[ 0.000000] dump_stack_lvl+0x74/0x8c\n[ 0.000000] dump_stack+0x18/0x24\n[ 0.000000] print_trailer+0x150/0x218\n[ 0.000000] check_object+0xe4/0x454\n[ 0.000000] free_to_partial_list+0x2f8/0x5ec\n\nTo address the issue, use orig_size to clear the used area. And restore\nthe value of orig_size after clear the remaining area.\n\nWhen CONFIG_SLUB_DEBUG not defined, (get_orig_size()' directly returns\ns->object_size. So when using memset to init the area, the size can simply\nbe orig_size, as orig_size returns object_size when CONFIG_SLUB_DEBUG not\nenabled. And orig_size can never be bigger than object_size.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "946fa0dbf2d8923a587f7348adf16563d59f1b3d", "status": "affected", "versionType": "git", "lessThan": "7299868253c0e8ba9bf31f6e5198e8eafa1e700b" }, { "version": "946fa0dbf2d8923a587f7348adf16563d59f1b3d", "status": "affected", "versionType": "git", "lessThan": "7a2e823a19746d54052c625faecf0d2d6c52ee0a" }, { "version": "946fa0dbf2d8923a587f7348adf16563d59f1b3d", "status": "affected", "versionType": "git", "lessThan": "83f0440b2f92227fcce9898118ca7fe7e0d64b1f" }, { "version": "946fa0dbf2d8923a587f7348adf16563d59f1b3d", "status": "affected", "versionType": "git", "lessThan": "59090e479ac78ae18facd4c58eb332562a23020e" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.2" }, { "version": "6.6.160", "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": "*" } ] } ] } } }