binder: fix use-after-free in shinker's callback (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.29 % · percentile 22 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
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.
Weaknesses (CWE)
- CWE-416 — Use After Free
References
- https://git.kernel.org/stable/c/a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3
- https://git.kernel.org/stable/c/c8c1158ffb007197f31f9d9170cf13e4f34cbb5c
- https://git.kernel.org/stable/c/8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6
- https://git.kernel.org/stable/c/9fa04c93f24138747807fe75b5591bb680098f56
- https://git.kernel.org/stable/c/a49087ab93508b60d9b8add91707a22dda832869
- https://git.kernel.org/stable/c/e074686e993ff1be5f21b085a3b1b4275ccd5727
- https://git.kernel.org/stable/c/3f489c2067c5824528212b0fc18b28d51332d906
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2023-57063
- GCVE · GCVE-0-2023-52438
CERT-FR advisories
- CERTFR-2024-AVI-0527 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0301 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0226 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.20.0 < 5.4.268cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.5.0 < 5.10.209cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11.0 < 5.15.148cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16.0 < 6.1.74cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2.0 < 6.6.13cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7.0 < 6.7.1
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f < a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3 ; affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f < c8c1158ffb007197f31f9d9170cf13e4f34cbb5c ; affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f < 8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6 ; affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f < 9fa04c93f24138747807fe75b5591bb680098f56 ; affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f < a49087ab93508b60d9b8add91707a22dda832869 ; affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f < e074686e993ff1be5f21b085a3b1b4275ccd5727 |
| Linux · Linux | affected 4.20 ; unaffected 0 < 4.20 ; unaffected 5.4.268 ≤ 5.4.* ; unaffected 5.10.209 ≤ 5.10.* ; unaffected 5.15.148 ≤ 5.15.* ; unaffected 6.1.74 ≤ 6.1.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |