{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-36892", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-30T15:25:07.065Z", "datePublished": "2024-05-30T15:28:58.528Z", "dateUpdated": "2026-05-11T20:16:30.669Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:16:30.669Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid zeroing outside-object freepointer for single free\n\nCommit 284f17ac13fe (\"mm/slub: handle bulk and single object freeing\nseparately\") splits single and bulk object freeing in two functions\nslab_free() and slab_free_bulk() which leads slab_free() to call\nslab_free_hook() directly instead of slab_free_freelist_hook().\n\nIf `init_on_free` is set, slab_free_hook() zeroes the object.\nAfterward, if `slub_debug=F` and `CONFIG_SLAB_FREELIST_HARDENED` are\nset, the do_slab_free() slowpath executes freelist consistency\nchecks and try to decode a zeroed freepointer which leads to a\n\"Freepointer corrupt\" detection in check_object().\n\nDuring bulk free, slab_free_freelist_hook() isn't affected as it always\nsets it objects freepointer using set_freepointer() to maintain its\nreconstructed freelist after `init_on_free`.\n\nFor single free, object's freepointer thus needs to be avoided when\nstored outside the object if `init_on_free` is set. The freepointer left\nas is, check_object() may later detect an invalid pointer value due to\nobjects overflow.\n\nTo reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the\ncommand line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`.\n\ndmesg sample log:\n[ 10.708715] =============================================================================\n[ 10.710323] BUG kmalloc-rnd-05-32 (Tainted: G B T ): Freepointer corrupt\n[ 10.712695] -----------------------------------------------------------------------------\n[ 10.712695]\n[ 10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2)\n[ 10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c\n[ 10.716698]\n[ 10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n[ 10.720703] Object ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n[ 10.720703] Object ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n[ 10.724696] Padding ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n[ 10.724696] Padding ffff9d9a8035667c: 00 00 00 00 ....\n[ 10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/slub.c" ], "versions": [ { "version": "284f17ac13fe34ae9eecbe57bb91553374d9b855", "lessThan": "56900355485f6e82114b18c812edd57fd7970dcb", "status": "affected", "versionType": "git" }, { "version": "284f17ac13fe34ae9eecbe57bb91553374d9b855", "lessThan": "8f828aa48812ced28aa39cb3cfe55ef2444d03dd", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/slub.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.10", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.8.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/56900355485f6e82114b18c812edd57fd7970dcb" }, { "url": "https://git.kernel.org/stable/c/8f828aa48812ced28aa39cb3cfe55ef2444d03dd" } ], "title": "mm/slub: avoid zeroing outside-object freepointer for single free", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-10T18:49:22.924151Z", "id": "CVE-2024-36892", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-30T15:12:52.190Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:43:49.159Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/56900355485f6e82114b18c812edd57fd7970dcb", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/8f828aa48812ced28aa39cb3cfe55ef2444d03dd", "tags": [ "x_transferred" ] } ] } ] } }