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CVE-2024-45025— fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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close_range组件存在位图损坏问题。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1003 · OS Credential Dumping

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 278a5fbaed89dacd04e9d052f4594ffd0e0585de< fe5bf14881701119aeeda7cf685f3c226c7380df affected
278a5fbaed89dacd04e9d052f4594ffd0e0585de< 5053581fe5dfb09b58c65dd8462bf5dea71f41ff affected
278a5fbaed89dacd04e9d052f4594ffd0e0585de< 8cad3b2b3ab81ca55f37405ffd1315bcc2948058 affected
278a5fbaed89dacd04e9d052f4594ffd0e0585de< dd72ae8b0fce9c0bbe9582b9b50820f0407f8d8a affected
278a5fbaed89dacd04e9d052f4594ffd0e0585de< c69d18f0ac7060de724511537810f10f29a27958 affected
278a5fbaed89dacd04e9d052f4594ffd0e0585de< 9a2fa1472083580b6c66bdaf291f591e1170123a affected
5.9 affected
< 5.9 unaffected
… +6 more rows
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I. Basic Information for CVE-2024-45025

Vulnerability Information
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Vulnerability Title
fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE copy_fd_bitmaps(new, old, count) is expected to copy the first count/BITS_PER_LONG bits from old->full_fds_bits[] and fill the rest with zeroes. What it does is copying enough words (BITS_TO_LONGS(count/BITS_PER_LONG)), then memsets the rest. That works fine, *if* all bits past the cutoff point are clear. Otherwise we are risking garbage from the last word we'd copied. For most of the callers that is true - expand_fdtable() has count equal to old->max_fds, so there's no open descriptors past count, let alone fully occupied words in ->open_fds[], which is what bits in ->full_fds_bits[] correspond to. The other caller (dup_fd()) passes sane_fdtable_size(old_fdt, max_fds), which is the smallest multiple of BITS_PER_LONG that covers all opened descriptors below max_fds. In the common case (copying on fork()) max_fds is ~0U, so all opened descriptors will be below it and we are fine, by the same reasons why the call in expand_fdtable() is safe. Unfortunately, there is a case where max_fds is less than that and where we might, indeed, end up with junk in ->full_fds_bits[] - close_range(from, to, CLOSE_RANGE_UNSHARE) with * descriptor table being currently shared * 'to' being above the current capacity of descriptor table * 'from' being just under some chunk of opened descriptors. In that case we end up with observably wrong behaviour - e.g. spawn a child with CLONE_FILES, get all descriptors in range 0..127 open, then close_range(64, ~0U, CLOSE_RANGE_UNSHARE) and watch dup(0) ending up with descriptor #128, despite #64 being observably not open. The minimally invasive fix would be to deal with that in dup_fd(). If this proves to add measurable overhead, we can go that way, but let's try to fix copy_fd_bitmaps() first. * new helper: bitmap_copy_and_expand(to, from, bits_to_copy, size). * make copy_fd_bitmaps() take the bitmap size in words, rather than bits; it's 'count' argument is always a multiple of BITS_PER_LONG, so we are not losing any information, and that way we can use the same helper for all three bitmaps - compiler will see that count is a multiple of BITS_PER_LONG for the large ones, so it'll generate plain memcpy()+memset(). Reproducer added to tools/testing/selftests/core/close_range_test.c
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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close_range组件存在位图损坏问题。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 278a5fbaed89dacd04e9d052f4594ffd0e0585de ~ fe5bf14881701119aeeda7cf685f3c226c7380df -
Linux Linux 5.9 -

II. Public POCs for CVE-2024-45025

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III. Intelligence Information for CVE-2024-45025

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Patches & Fixes for CVE-2024-45025 (8)

Same Patch Batch · Linux · 2024-09-11 · 23 CVEs total

CVE-2024-45030 9.8 CRITICAL igb: cope with large MAX_SKB_FRAGS
CVE-2024-45013 9.8 CRITICAL nvme: move stopping keep-alive into nvme_uninit_ctrl()
CVE-2024-45009 8.2 HIGH mptcp: pm: only decrement add_addr_accepted for MPJ req
CVE-2024-45019 7.8 HIGH net/mlx5e: Take state lock during tx timeout reporter
CVE-2024-45016 7.8 HIGH netem: fix return value if duplicate enqueue fails
CVE-2024-45017 7.8 HIGH net/mlx5: Fix IPsec RoCE MPV trace call
CVE-2024-45020 7.8 HIGH bpf: Fix a kernel verifier crash in stacksafe()
CVE-2024-45023 7.8 HIGH md/raid1: Fix data corruption for degraded array with slow disk
CVE-2024-45022 7.8 HIGH mm/vmalloc: fix page mapping if vm_area_alloc_pages() with high order fallback to order 0
CVE-2024-45024 7.8 HIGH mm/hugetlb: fix hugetlb vs. core-mm PT locking
CVE-2024-45021 7.1 HIGH memcg_write_event_control(): fix a user-triggerable oops
CVE-2024-45026 7.0 HIGH s390/dasd: fix error recovery leading to data corruption on ESE devices
CVE-2024-46672 wifi: brcmfmac: cfg80211: Handle SSID based pmksa deletion
CVE-2024-45018 netfilter: flowtable: initialise extack before use
CVE-2024-45027 usb: xhci: Check for xhci->interrupters being allocated in xhci_mem_clearup()
CVE-2024-45014 s390/boot: Avoid possible physmem_info segment corruption
CVE-2024-45015 drm/msm/dpu: move dpu_encoder's connector assignment to atomic_enable()
CVE-2024-45012 nouveau/firmware: use dma non-coherent allocator
CVE-2024-45029 i2c: tegra: Do not mark ACPI devices as irq safe
CVE-2024-45011 char: xillybus: Check USB endpoints when probing device

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-45025

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