Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2023-52438— binder: fix use-after-free in shinker's callback

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 binder 模块的 shinker 回调中存在释放后重用问题。

CVSS 7.8 · High EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux dd2283f2605e3b3e9c61bcae844b34f2afa4813f< a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3 affected
dd2283f2605e3b3e9c61bcae844b34f2afa4813f< c8c1158ffb007197f31f9d9170cf13e4f34cbb5c affected
dd2283f2605e3b3e9c61bcae844b34f2afa4813f< 8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6 affected
dd2283f2605e3b3e9c61bcae844b34f2afa4813f< 9fa04c93f24138747807fe75b5591bb680098f56 affected
dd2283f2605e3b3e9c61bcae844b34f2afa4813f< a49087ab93508b60d9b8add91707a22dda832869 affected
dd2283f2605e3b3e9c61bcae844b34f2afa4813f< e074686e993ff1be5f21b085a3b1b4275ccd5727 affected
dd2283f2605e3b3e9c61bcae844b34f2afa4813f< 3f489c2067c5824528212b0fc18b28d51332d906 affected
4.20 affected
… +8 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2023-52438

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
binder: fix use-after-free in shinker's callback
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: binder: fix use-after-free in shinker's callback The mmap read lock is used during the shrinker's callback, which means that using alloc->vma pointer isn't safe as it can race with munmap(). As of commit dd2283f2605e ("mm: mmap: zap pages with read mmap_sem in munmap") the mmap lock is downgraded after the vma has been isolated. I was able to reproduce this issue by manually adding some delays and triggering page reclaiming through the shrinker's debug sysfs. The following KASAN report confirms the UAF: ================================================================== BUG: KASAN: slab-use-after-free in zap_page_range_single+0x470/0x4b8 Read of size 8 at addr ffff356ed50e50f0 by task bash/478 CPU: 1 PID: 478 Comm: bash Not tainted 6.6.0-rc5-00055-g1c8b86a3799f-dirty #70 Hardware name: linux,dummy-virt (DT) Call trace: zap_page_range_single+0x470/0x4b8 binder_alloc_free_page+0x608/0xadc __list_lru_walk_one+0x130/0x3b0 list_lru_walk_node+0xc4/0x22c binder_shrink_scan+0x108/0x1dc shrinker_debugfs_scan_write+0x2b4/0x500 full_proxy_write+0xd4/0x140 vfs_write+0x1ac/0x758 ksys_write+0xf0/0x1dc __arm64_sys_write+0x6c/0x9c Allocated by task 492: kmem_cache_alloc+0x130/0x368 vm_area_alloc+0x2c/0x190 mmap_region+0x258/0x18bc do_mmap+0x694/0xa60 vm_mmap_pgoff+0x170/0x29c ksys_mmap_pgoff+0x290/0x3a0 __arm64_sys_mmap+0xcc/0x144 Freed by task 491: kmem_cache_free+0x17c/0x3c8 vm_area_free_rcu_cb+0x74/0x98 rcu_core+0xa38/0x26d4 rcu_core_si+0x10/0x1c __do_softirq+0x2fc/0xd24 Last potentially related work creation: __call_rcu_common.constprop.0+0x6c/0xba0 call_rcu+0x10/0x1c vm_area_free+0x18/0x24 remove_vma+0xe4/0x118 do_vmi_align_munmap.isra.0+0x718/0xb5c do_vmi_munmap+0xdc/0x1fc __vm_munmap+0x10c/0x278 __arm64_sys_munmap+0x58/0x7c Fix this issue by performing instead a vma_lookup() which will fail to find the vma that was isolated before the mmap lock downgrade. Note that this option has better performance than upgrading to a mmap write lock which would increase contention. Plus, mmap_write_trylock() has been recently removed anyway.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 binder 模块的 shinker 回调中存在释放后重用问题。
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 dd2283f2605e3b3e9c61bcae844b34f2afa4813f ~ a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3 -
Linux Linux 4.20 -

II. Public POCs for CVE-2023-52438

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2023-52438

请登录查看更多情报信息。

Mailing List Discussions for CVE-2023-52438 (1)

Other References for CVE-2023-52438 (7)

Same Patch Batch · Linux · 2024-02-20 · 7 CVEs total

CVE-2023-52434 8.1 HIGH smb: client: fix potential OOBs in smb2_parse_contexts()
CVE-2023-52433 7.8 HIGH netfilter: nft_set_rbtree: skip sync GC for new elements in this transaction
CVE-2024-26581 7.8 HIGH netfilter: nft_set_rbtree: skip end interval element from gc
CVE-2023-52436 7.8 HIGH f2fs: explicitly null-terminate the xattr list
CVE-2023-52439 7.8 HIGH uio: Fix use-after-free in uio_open
CVE-2023-52435 net: prevent mss overflow in skb_segment()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52438

No comments yet

Leave a comment