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CVE-2022-48731— mm/kmemleak: avoid scanning potential huge holes

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。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。

AI Predicted 5.5 Difficulty: Easy EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378< d3533ee20e9a0e2e8f60384da7450d43d1c63d1a affected
4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378< 352715593e81b917ce1b321e794549815b850134 affected
4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378< a5389c80992f0001ee505838fe6a8b20897ce96e affected
4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378< cebb0aceb21ad91429617a40e3a17444fabf1529 affected
4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378< c10a0f877fe007021d70f9cada240f42adc2b5db affected
4.14 affected
< 4.14 unaffected
5.4.178≤ 5.4.* unaffected
… +4 more rows
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I. Basic Information for CVE-2022-48731

Vulnerability Information
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Vulnerability Title
mm/kmemleak: avoid scanning potential huge holes
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid scanning potential huge holes When using devm_request_free_mem_region() and devm_memremap_pages() to add ZONE_DEVICE memory, if requested free mem region's end pfn were huge(e.g., 0x400000000), the node_end_pfn() will be also huge (see move_pfn_range_to_zone()). Thus it creates a huge hole between node_start_pfn() and node_end_pfn(). We found on some AMD APUs, amdkfd requested such a free mem region and created a huge hole. In such a case, following code snippet was just doing busy test_bit() looping on the huge hole. for (pfn = start_pfn; pfn < end_pfn; pfn++) { struct page *page = pfn_to_online_page(pfn); if (!page) continue; ... } So we got a soft lockup: watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221] CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1 RIP: 0010:pfn_to_online_page+0x5/0xd0 Call Trace: ? kmemleak_scan+0x16a/0x440 kmemleak_write+0x306/0x3a0 ? common_file_perm+0x72/0x170 full_proxy_write+0x5c/0x90 vfs_write+0xb9/0x260 ksys_write+0x67/0xe0 __x64_sys_write+0x1a/0x20 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae I did some tests with the patch. (1) amdgpu module unloaded before the patch: real 0m0.976s user 0m0.000s sys 0m0.968s after the patch: real 0m0.981s user 0m0.000s sys 0m0.973s (2) amdgpu module loaded before the patch: real 0m35.365s user 0m0.000s sys 0m35.354s after the patch: real 0m1.049s user 0m0.000s sys 0m1.042s
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。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
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 4ef589dc9b10cdcae75a2b2b0e9b2c5e8a92c378 ~ d3533ee20e9a0e2e8f60384da7450d43d1c63d1a -
Linux Linux 4.14 -

II. Public POCs for CVE-2022-48731

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III. Intelligence Information for CVE-2022-48731

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Other References for CVE-2022-48731 (4)

Same Patch Batch · Linux · 2024-06-20 · 67 CVEs total

CVE-2022-48711 9.8 CRITICAL tipc: improve size validations for received domain records
CVE-2024-38620 8.8 HIGH Bluetooth: HCI: Remove HCI_AMP support
CVE-2021-47620 8.1 HIGH Bluetooth: refactor malicious adv data check
CVE-2022-48743 8.1 HIGH net: amd-xgbe: Fix skb data length underflow
CVE-2022-48720 7.8 HIGH net: macsec: Fix offload support for NETDEV_UNREGISTER event
CVE-2022-48716 7.8 HIGH ASoC: codecs: wcd938x: fix incorrect used of portid
CVE-2022-48771 7.8 HIGH drm/vmwgfx: Fix stale file descriptors on failed usercopy
CVE-2022-48751 7.8 HIGH net/smc: Transitional solution for clcsock race issue
CVE-2022-48742 7.8 HIGH rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink()
CVE-2022-48754 7.8 HIGH phylib: fix potential use-after-free
CVE-2022-48733 7.8 HIGH btrfs: fix use-after-free after failure to create a snapshot
CVE-2022-48721 7.8 HIGH net/smc: Forward wakeup to smc socket waitqueue after fallback
CVE-2022-48762 7.8 HIGH arm64: extable: fix load_unaligned_zeropad() reg indices
CVE-2022-48726 7.8 HIGH RDMA/ucma: Protect mc during concurrent multicast leaves
CVE-2022-48735 7.8 HIGH ALSA: hda: Fix UAF of leds class devs at unbinding
CVE-2022-48729 7.8 HIGH IB/hfi1: Fix panic with larger ipoib send_queue_size
CVE-2022-48759 7.8 HIGH rpmsg: char: Fix race between the release of rpmsg_ctrldev and cdev
CVE-2022-48744 7.5 HIGH net/mlx5e: Avoid field-overflowing memcpy()
CVE-2022-48727 7.3 HIGH KVM: arm64: Avoid consuming a stale esr value when SError occur
CVE-2022-48739 7.1 HIGH ASoC: hdmi-codec: Fix OOB memory accesses

Showing top 20 of 67 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-48731

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