{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48923", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T06:06:23.296Z", "datePublished": "2024-08-22T01:32:58.084Z", "dateUpdated": "2026-08-05T08:52:55.898Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:52:55.898Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: prevent copying too big compressed lzo segment\n\nCompressed length can be corrupted to be a lot larger than memory\nwe have allocated for buffer.\nThis will cause memcpy in copy_compressed_segment to write outside\nof allocated memory.\n\nThis mostly results in stuck read syscall but sometimes when using\nbtrfs send can get #GP\n\n kernel: general protection fault, probably for non-canonical address 0x841551d5c1000: 0000 [#1] PREEMPT SMP NOPTI\n kernel: CPU: 17 PID: 264 Comm: kworker/u256:7 Tainted: P OE 5.17.0-rc2-1 #12\n kernel: Workqueue: btrfs-endio btrfs_work_helper [btrfs]\n kernel: RIP: 0010:lzo_decompress_bio (./include/linux/fortify-string.h:225 fs/btrfs/lzo.c:322 fs/btrfs/lzo.c:394) btrfs\n Code starting with the faulting instruction\n ===========================================\n 0:* 48 8b 06 mov (%rsi),%rax <-- trapping instruction\n 3: 48 8d 79 08 lea 0x8(%rcx),%rdi\n 7: 48 83 e7 f8 and $0xfffffffffffffff8,%rdi\n b: 48 89 01 mov %rax,(%rcx)\n e: 44 89 f0 mov %r14d,%eax\n 11: 48 8b 54 06 f8 mov -0x8(%rsi,%rax,1),%rdx\n kernel: RSP: 0018:ffffb110812efd50 EFLAGS: 00010212\n kernel: RAX: 0000000000001000 RBX: 000000009ca264c8 RCX: ffff98996e6d8ff8\n kernel: RDX: 0000000000000064 RSI: 000841551d5c1000 RDI: ffffffff9500435d\n kernel: RBP: ffff989a3be856c0 R08: 0000000000000000 R09: 0000000000000000\n kernel: R10: 0000000000000000 R11: 0000000000001000 R12: ffff98996e6d8000\n kernel: R13: 0000000000000008 R14: 0000000000001000 R15: 000841551d5c1000\n kernel: FS: 0000000000000000(0000) GS:ffff98a09d640000(0000) knlGS:0000000000000000\n kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n kernel: CR2: 00001e9f984d9ea8 CR3: 000000014971a000 CR4: 00000000003506e0\n kernel: Call Trace:\n kernel: \n kernel: end_compressed_bio_read (fs/btrfs/compression.c:104 fs/btrfs/compression.c:1363 fs/btrfs/compression.c:323) btrfs\n kernel: end_workqueue_fn (fs/btrfs/disk-io.c:1923) btrfs\n kernel: btrfs_work_helper (fs/btrfs/async-thread.c:326) btrfs\n kernel: process_one_work (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:212 ./include/trace/events/workqueue.h:108 kernel/workqueue.c:2312)\n kernel: worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2455)\n kernel: ? process_one_work (kernel/workqueue.c:2397)\n kernel: kthread (kernel/kthread.c:377)\n kernel: ? kthread_complete_and_exit (kernel/kthread.c:332)\n kernel: ret_from_fork (arch/x86/entry/entry_64.S:301)\n kernel: " } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The overflow is reached only through local VFS reads of LZO-compressed extents (read → btrfs_submit_compressed_read → end_compressed_bio_read → lzo_decompress_bio → copy_compressed_segment) on a mounted btrfs image, not via any network protocol handler.\nAC:L - A crafted on-disk LZO segment header with an oversized LE32 seg_len deterministically drives memcpy past workspace->cbuf (sized only to lzo1x_worst_compress(PAGE_SIZE)); no race or attacker-uncontrollable layout is required.\nPR:N - The attacker needs no account on the target—only a malicious btrfs image (USB/SD/loop/cloud volume); normal writes cannot plant bad segment lengths, encoded write requires CAP_SYS_ADMIN, and btrfs lacks FS_USERNS_MOUNT so the privileged mount is performed by the victim/automounter.\nUI:R - Exploitation requires a user or automount daemon to mount the attacker-supplied btrfs volume and then read a compressed LZO extent so lzo_decompress_bio runs.\nS:U - Impact is confined to host-kernel heap corruption in the btrfs decompression path within the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - The unbounded heap overflow of workspace->cbuf (and OOB indexing of compressed_pages as cur_in grows) is memory corruption that can be leveraged for kernel information disclosure, so Confidentiality is High.\nI:H - memcpy of attacker-controlled length/content past the allocated cbuf is a classic out-of-bounds write enabling heap corruption and control-flow hijacking primitives, so Integrity is High.\nA:H - The bug produces documented general protection faults in lzo_decompress_bio and stuck reads/hangs, which are full kernel availability impact under CVSS guidance." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/btrfs/lzo.c" ], "versions": [ { "version": "a6e66e6f8c1b685e11b778bef614480a9c1a5278", "lessThan": "8df508b7a44cd8110c726057cd28e8f8116885eb", "status": "affected", "versionType": "git" }, { "version": "a6e66e6f8c1b685e11b778bef614480a9c1a5278", "lessThan": "e326bd06cdde46df952361456232022298281d16", "status": "affected", "versionType": "git" }, { "version": "a6e66e6f8c1b685e11b778bef614480a9c1a5278", "lessThan": "741b23a970a79d5d3a1db2d64fa2c7b375a4febb", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/btrfs/lzo.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.26", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.12", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17", "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": "5.15", "versionEndExcluding": "5.15.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.16.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.17" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8df508b7a44cd8110c726057cd28e8f8116885eb" }, { "url": "https://git.kernel.org/stable/c/e326bd06cdde46df952361456232022298281d16" }, { "url": "https://git.kernel.org/stable/c/741b23a970a79d5d3a1db2d64fa2c7b375a4febb" } ], "title": "btrfs: prevent copying too big compressed lzo segment", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2022-48923", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:33:22.056264Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:00.797Z" } } ] } }