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CVE-2024-50278— dm cache: fix potential out-of-bounds access on the first resume

EPSS 0.02% · P3
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I. Basic Information for CVE-2024-50278

Vulnerability Information
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Vulnerability Title
dm cache: fix potential out-of-bounds access on the first resume
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm cache: fix potential out-of-bounds access on the first resume Out-of-bounds access occurs if the fast device is expanded unexpectedly before the first-time resume of the cache table. This happens because expanding the fast device requires reloading the cache table for cache_create to allocate new in-core data structures that fit the new size, and the check in cache_preresume is not performed during the first resume, leading to the issue. Reproduce steps: 1. prepare component devices: dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 65536 linear /dev/sdc 8192" dmsetup create corig --table "0 524288 linear /dev/sdc 262144" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct 2. load a cache table of 512 cache blocks, and deliberately expand the fast device before resuming the cache, making the in-core data structures inadequate. dmsetup create cache --notable dmsetup reload cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" dmsetup reload cdata --table "0 131072 linear /dev/sdc 8192" dmsetup resume cdata dmsetup resume cache 3. suspend the cache to write out the in-core dirty bitset and hint array, leading to out-of-bounds access to the dirty bitset at offset 0x40: dmsetup suspend cache KASAN reports: BUG: KASAN: vmalloc-out-of-bounds in is_dirty_callback+0x2b/0x80 Read of size 8 at addr ffffc90000085040 by task dmsetup/90 (...snip...) The buggy address belongs to the virtual mapping at [ffffc90000085000, ffffc90000087000) created by: cache_ctr+0x176a/0x35f0 (...snip...) Memory state around the buggy address: ffffc90000084f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90000084f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 >ffffc90000085000: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90000085080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90000085100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 Fix by checking the size change on the first resume.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于允许越界访问内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 ~ e492f71854ce03474d49e87fd98b8df1f7cd1d2d -
LinuxLinux 3.13 -

II. Public POCs for CVE-2024-50278

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III. Intelligence Information for CVE-2024-50278

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Same Patch Batch · Linux · 2024-11-19 · 88 CVEs total

CVE-2024-53057net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT
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CVE-2024-53055wifi: iwlwifi: mvm: fix 6 GHz scan construction
CVE-2024-53052io_uring/rw: fix missing NOWAIT check for O_DIRECT start write
CVE-2024-53048ice: fix crash on probe for DPLL enabled E810 LOM
CVE-2024-53049slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache_noprof
CVE-2024-53047mptcp: init: protect sched with rcu_read_lock
CVE-2024-53045ASoC: dapm: fix bounds checker error in dapm_widget_list_create
CVE-2024-53046arm64: dts: imx8ulp: correct the flexspi compatible string
CVE-2024-53051drm/i915/hdcp: Add encoder check in intel_hdcp_get_capability
CVE-2024-53056drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy()
CVE-2024-53058net: stmmac: TSO: Fix unbalanced DMA map/unmap for non-paged SKB data
CVE-2024-53059wifi: iwlwifi: mvm: Fix response handling in iwl_mvm_send_recovery_cmd()
CVE-2024-53060drm/amdgpu: prevent NULL pointer dereference if ATIF is not supported
CVE-2024-53061media: s5p-jpeg: prevent buffer overflows
CVE-2024-53062media: mgb4: protect driver against spectre
CVE-2024-53064idpf: fix idpf_vc_core_init error path
CVE-2024-53063media: dvbdev: prevent the risk of out of memory access
CVE-2024-53066nfs: Fix KMSAN warning in decode_getfattr_attrs()
CVE-2024-53065mm/slab: fix warning caused by duplicate kmem_cache creation in kmem_buckets_create

Showing top 20 of 88 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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