{ "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-2024-46789", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-46789", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-09-18T07:12:45.154Z", "updatedAt": "2026-05-11T20:36:34.605Z", "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: add check for s->flags in the alloc_tagging_slab_free_hook", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: add check for s->flags in the alloc_tagging_slab_free_hook\n\nWhen enable CONFIG_MEMCG & CONFIG_KFENCE & CONFIG_KMEMLEAK, the following\nwarning always occurs,This is because the following call stack occurred:\nmem_pool_alloc\n kmem_cache_alloc_noprof\n slab_alloc_node\n kfence_alloc\n\nOnce the kfence allocation is successful,slab->obj_exts will not be empty,\nbecause it has already been assigned a value in kfence_init_pool.\n\nSince in the prepare_slab_obj_exts_hook function,we perform a check for\ns->flags & (SLAB_NO_OBJ_EXT | SLAB_NOLEAKTRACE),the alloc_tag_add function\nwill not be called as a result.Therefore,ref->ct remains NULL.\n\nHowever,when we call mem_pool_free,since obj_ext is not empty, it\neventually leads to the alloc_tag_sub scenario being invoked. This is\nwhere the warning occurs.\n\nSo we should add corresponding checks in the alloc_tagging_slab_free_hook.\nFor __GFP_NO_OBJ_EXT case,I didn't see the specific case where it's using\nkfence,so I won't add the corresponding check in\nalloc_tagging_slab_free_hook for now.\n\n[ 3.734349] ------------[ cut here ]------------\n[ 3.734807] alloc_tag was not set\n[ 3.735129] WARNING: CPU: 4 PID: 40 at ./include/linux/alloc_tag.h:130 kmem_cache_free+0x444/0x574\n[ 3.735866] Modules linked in: autofs4\n[ 3.736211] CPU: 4 UID: 0 PID: 40 Comm: ksoftirqd/4 Tainted: G W 6.11.0-rc3-dirty #1\n[ 3.736969] Tainted: [W]=WARN\n[ 3.737258] Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022\n[ 3.737875] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 3.738501] pc : kmem_cache_free+0x444/0x574\n[ 3.738951] lr : kmem_cache_free+0x444/0x574\n[ 3.739361] sp : ffff80008357bb60\n[ 3.739693] x29: ffff80008357bb70 x28: 0000000000000000 x27: 0000000000000000\n[ 3.740338] x26: ffff80008207f000 x25: ffff000b2eb2fd60 x24: ffff0000c0005700\n[ 3.740982] x23: ffff8000804229e4 x22: ffff800082080000 x21: ffff800081756000\n[ 3.741630] x20: fffffd7ff8253360 x19: 00000000000000a8 x18: ffffffffffffffff\n[ 3.742274] x17: ffff800ab327f000 x16: ffff800083398000 x15: ffff800081756df0\n[ 3.742919] x14: 0000000000000000 x13: 205d344320202020 x12: 5b5d373038343337\n[ 3.743560] x11: ffff80008357b650 x10: 000000000000005d x9 : 00000000ffffffd0\n[ 3.744231] x8 : 7f7f7f7f7f7f7f7f x7 : ffff80008237bad0 x6 : c0000000ffff7fff\n[ 3.744907] x5 : ffff80008237ba78 x4 : ffff8000820bbad0 x3 : 0000000000000001\n[ 3.745580] x2 : 68d66547c09f7800 x1 : 68d66547c09f7800 x0 : 0000000000000000\n[ 3.746255] Call trace:\n[ 3.746530] kmem_cache_free+0x444/0x574\n[ 3.746931] mem_pool_free+0x44/0xf4\n[ 3.747306] free_object_rcu+0xc8/0xdc\n[ 3.747693] rcu_do_batch+0x234/0x8a4\n[ 3.748075] rcu_core+0x230/0x3e4\n[ 3.748424] rcu_core_si+0x14/0x1c\n[ 3.748780] handle_softirqs+0x134/0x378\n[ 3.749189] run_ksoftirqd+0x70/0x9c\n[ 3.749560] smpboot_thread_fn+0x148/0x22c\n[ 3.749978] kthread+0x10c/0x118\n[ 3.750323] ret_from_fork+0x10/0x20\n[ 3.750696] ---[ end trace 0000000000000000 ]---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "4b8736964640fe160724e7135dc62883bddcdace", "status": "affected", "versionType": "git", "lessThan": "2d476c86ba4745fcbc912ce4627df4fa80caa9ad" }, { "version": "4b8736964640fe160724e7135dc62883bddcdace", "status": "affected", "versionType": "git", "lessThan": "ab7ca09520e9c41c219a4427fe0dae24024bfe7f" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.10" }, { "version": "6.10.10", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.10.*" }, { "version": "6.11", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }