CVE-2023-52438 (GCVE-0-2023-52438)
Vulnerability from cvelistv5
Published
2024-02-20 18:34
Modified
2026-08-05 09:09
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f |
||
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\"e074686e993ff1be5f21b085a3b1b4275ccd5727\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dd2283f2605e3b3e9c61bcae844b34f2afa4813f\", \"lessThan\": \"3f489c2067c5824528212b0fc18b28d51332d906\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/android/binder_alloc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.20\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.268\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.74\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/android/binder_alloc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3\"}, {\"url\": \"https://git.kernel.org/stable/c/c8c1158ffb007197f31f9d9170cf13e4f34cbb5c\"}, {\"url\": \"https://git.kernel.org/stable/c/8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6\"}, {\"url\": \"https://git.kernel.org/stable/c/9fa04c93f24138747807fe75b5591bb680098f56\"}, {\"url\": \"https://git.kernel.org/stable/c/a49087ab93508b60d9b8add91707a22dda832869\"}, {\"url\": \"https://git.kernel.org/stable/c/e074686e993ff1be5f21b085a3b1b4275ccd5727\"}, {\"url\": \"https://git.kernel.org/stable/c/3f489c2067c5824528212b0fc18b28d51332d906\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbinder: fix use-after-free in shinker\u0027s callback\\n\\nThe mmap read lock is used during the shrinker\u0027s callback, which means\\nthat using alloc-\u003evma pointer isn\u0027t safe as it can race with munmap().\\nAs of commit dd2283f2605e (\\\"mm: mmap: zap pages with read mmap_sem in\\nmunmap\\\") the mmap lock is downgraded after the vma has been isolated.\\n\\nI was able to reproduce this issue by manually adding some delays and\\ntriggering page reclaiming through the shrinker\u0027s debug sysfs. The\\nfollowing KASAN report confirms the UAF:\\n\\n ==================================================================\\n BUG: KASAN: slab-use-after-free in zap_page_range_single+0x470/0x4b8\\n Read of size 8 at addr ffff356ed50e50f0 by task bash/478\\n\\n CPU: 1 PID: 478 Comm: bash Not tainted 6.6.0-rc5-00055-g1c8b86a3799f-dirty #70\\n Hardware name: linux,dummy-virt (DT)\\n Call trace:\\n zap_page_range_single+0x470/0x4b8\\n binder_alloc_free_page+0x608/0xadc\\n __list_lru_walk_one+0x130/0x3b0\\n list_lru_walk_node+0xc4/0x22c\\n binder_shrink_scan+0x108/0x1dc\\n shrinker_debugfs_scan_write+0x2b4/0x500\\n full_proxy_write+0xd4/0x140\\n vfs_write+0x1ac/0x758\\n ksys_write+0xf0/0x1dc\\n __arm64_sys_write+0x6c/0x9c\\n\\n Allocated by task 492:\\n kmem_cache_alloc+0x130/0x368\\n vm_area_alloc+0x2c/0x190\\n mmap_region+0x258/0x18bc\\n do_mmap+0x694/0xa60\\n vm_mmap_pgoff+0x170/0x29c\\n ksys_mmap_pgoff+0x290/0x3a0\\n __arm64_sys_mmap+0xcc/0x144\\n\\n Freed by task 491:\\n kmem_cache_free+0x17c/0x3c8\\n vm_area_free_rcu_cb+0x74/0x98\\n rcu_core+0xa38/0x26d4\\n rcu_core_si+0x10/0x1c\\n __do_softirq+0x2fc/0xd24\\n\\n Last potentially related work creation:\\n __call_rcu_common.constprop.0+0x6c/0xba0\\n call_rcu+0x10/0x1c\\n vm_area_free+0x18/0x24\\n remove_vma+0xe4/0x118\\n do_vmi_align_munmap.isra.0+0x718/0xb5c\\n do_vmi_munmap+0xdc/0x1fc\\n __vm_munmap+0x10c/0x278\\n __arm64_sys_munmap+0x58/0x7c\\n\\nFix this issue by performing instead a vma_lookup() which will fail to\\nfind the vma that was isolated before the mmap lock downgrade. Note that\\nthis option has better performance than upgrading to a mmap write lock\\nwhich would increase contention. Plus, mmap_write_trylock() has been\\nrecently removed anyway.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.268\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.209\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.148\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.74\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.13\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.1\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"4.20\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:36:28.136Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2023-52438\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:36:28.136Z\", \"dateReserved\": \"2024-02-20T12:30:33.290Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-20T18:34:48.694Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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