{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48674", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:44:28.322Z", "datePublished": "2024-05-03T14:51:57.294Z", "dateUpdated": "2026-08-05T08:51:44.056Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:51:44.056Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix pcluster use-after-free on UP platforms\n\nDuring stress testing with CONFIG_SMP disabled, KASAN reports as below:\n\n==================================================================\nBUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30\nRead of size 8 at addr ffff8881094223f8 by task stress/7789\n\nCPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3\nHardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\nCall Trace:\n \n..\n __mutex_lock+0xe5/0xc30\n..\n z_erofs_do_read_page+0x8ce/0x1560\n..\n z_erofs_readahead+0x31c/0x580\n..\nFreed by task 7787\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x20/0x30\n kasan_set_free_info+0x20/0x40\n __kasan_slab_free+0x10c/0x190\n kmem_cache_free+0xed/0x380\n rcu_core+0x3d5/0xc90\n __do_softirq+0x12d/0x389\n\nLast potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x97/0xb0\n call_rcu+0x3d/0x3f0\n erofs_shrink_workstation+0x11f/0x210\n erofs_shrink_scan+0xdc/0x170\n shrink_slab.constprop.0+0x296/0x530\n drop_slab+0x1c/0x70\n drop_caches_sysctl_handler+0x70/0x80\n proc_sys_call_handler+0x20a/0x2f0\n vfs_write+0x555/0x6c0\n ksys_write+0xbe/0x160\n do_syscall_64+0x3b/0x90\n\nThe root cause is that erofs_workgroup_unfreeze() doesn't reset to\norig_val thus it causes a race that the pcluster reuses unexpectedly\nbefore freeing.\n\nSince UP platforms are quite rare now, such path becomes unnecessary.\nLet's drop such specific-designed path directly instead." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is reached only through local VFS reads of compressed EROFS files (z_erofs_readahead/z_erofs_do_read_page → erofs_find_workgroup) racing the local erofs shrinker; erofs uses FS_REQUIRES_DEV and has no network-protocol entry point.\nAC:L - On a vulnerable !CONFIG_SMP kernel the attacker controls both sides—concurrent reads of already-mounted compressed EROFS files plus memory pressure that drives erofs_shrink_scan—so the failed unfreeze-to-0 race is reliably repeatable without conditions outside attacker influence.\nPR:L - Mounting needs CAP_SYS_ADMIN, but once EROFS is mounted (common on Android system images and container rootfs), an unprivileged local user triggers the path by ordinary open/read of compressed files and by inducing reclaim; no real root is required.\nUI:N - The attacker drives the reads and memory pressure themselves on a pre-mounted EROFS volume; no separate victim action such as mounting or opening a crafted file is required.\nS:U - The pcluster slab UAF corrupts host-kernel memory within the same privilege domain; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - This is a use-after-free of a z_erofs_pcluster (KASAN UAF in __mutex_lock on pcl->lock after RCU free), which enables heap reuse and arbitrary kernel read primitives.\nI:H - UAF of the heap-allocated pcluster (mutex, page pointers, decompression state) is heap-sprayable and can yield arbitrary write / control-flow hijacking primitives in kernel context.\nA:H - The demonstrated KASAN use-after-free and further use of the freed pcluster can oops or panic the kernel even without full exploitation, which is Availability High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/erofs/internal.h" ], "versions": [ { "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "8ddd001cef5e82d19192e6861068463ecca5f556", "status": "affected", "versionType": "git" }, { "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "94c34faaafe7b55adc2d8d881db195b646959b9e", "status": "affected", "versionType": "git" }, { "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "2f44013e39984c127c6efedf70e6b5f4e9dcf315", "status": "affected", "versionType": "git" }, { "version": "08ec9e6892cc792d7f8fe4d13bd8a0e91fb23488", "status": "affected", "versionType": "git" }, { "version": "78c46113413bea1cc345757112aa2642e0f66de5", "status": "affected", "versionType": "git" }, { "version": "4.19.26", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "4.20.13", "lessThan": "4.21", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/erofs/internal.h" ], "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.68", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.9", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "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": "5.0", "versionEndExcluding": "5.15.68" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.19.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.0" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8ddd001cef5e82d19192e6861068463ecca5f556" }, { "url": "https://git.kernel.org/stable/c/94c34faaafe7b55adc2d8d881db195b646959b9e" }, { "url": "https://git.kernel.org/stable/c/2f44013e39984c127c6efedf70e6b5f4e9dcf315" } ], "title": "erofs: fix pcluster use-after-free on UP platforms", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 6.2, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-17T17:40:01.935760Z", "id": "CVE-2022-48674", "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": "2024-11-21T21:25:20.019Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:17:55.810Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/8ddd001cef5e82d19192e6861068463ecca5f556", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/94c34faaafe7b55adc2d8d881db195b646959b9e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2f44013e39984c127c6efedf70e6b5f4e9dcf315", "tags": [ "x_transferred" ] } ] } ] } }