CVE-2022-50240
android: binder: stop saving a pointer to the VMA
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: android: binder: stop saving a pointer to the VMA Do not record a pointer to a VMA outside of the mmap_lock for later use. This is unsafe and there are a number of failure paths *after* the recorded VMA pointer may be freed during setup. There is no callback to the driver to clear the saved pointer from generic mm code. Furthermore, the VMA pointer may become stale if any number of VMA operations end up freeing the VMA so saving it was fragile to being with. Instead, change the binder_alloc struct to record the start address of the VMA and use vma_lookup() to get the vma when needed. Add lockdep mmap_lock checks on updates to the vma pointer to ensure the lock is held and depend on that lock for synchronization of readers and writers - which was already the case anyways, so the smp_wmb()/smp_rmb() was not necessary. [[email protected]: fix drivers/android/binder_alloc_selftest.c]
Timeline
ID reserved
By Linux
Published
- 11 months later
· 11 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (8 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f – < 27a594bc7a7c8238d239e3cdbcf2edfa3bbe9a1b
- affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f – < 015ac18be7de25d17d6e5f1643cb3b60bfbe859e
- affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f – < 622ef885a89ad04cfb76ee478fb44f051125d1f1
- affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f – < 925e6b6f82c9c80ab3c17acbde8d16f349da7d26
- affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f – < 1ec3f76a436d750fd5023caec5da0494fc2870d2
- affected dd2283f2605e3b3e9c61bcae844b34f2afa4813f – < a43cfc87caaf46710c8027a8c23b8a55f1078f19
- affected 4.20
- unaffected < 4.20
- unaffected 5.4.224 – ≤ 5.4.*
- unaffected 5.10.154 – ≤ 5.10.*
- unaffected 5.15.61 – ≤ 5.15.*
- unaffected 5.18.18 – ≤ 5.18.*
- unaffected 5.19.2 – ≤ 5.19.*
- unaffected 6.0 – ≤ *
References (6)
- https://git.kernel.org/stable/c/27a594bc7a7c8238d239e3cdbcf2edfa3bbe9a1b (opens in a new tab)
- https://git.kernel.org/stable/c/015ac18be7de25d17d6e5f1643cb3b60bfbe859e (opens in a new tab)
- https://git.kernel.org/stable/c/622ef885a89ad04cfb76ee478fb44f051125d1f1 (opens in a new tab)
- https://git.kernel.org/stable/c/925e6b6f82c9c80ab3c17acbde8d16f349da7d26 (opens in a new tab)
- https://git.kernel.org/stable/c/1ec3f76a436d750fd5023caec5da0494fc2870d2 (opens in a new tab)
- https://git.kernel.org/stable/c/a43cfc87caaf46710c8027a8c23b8a55f1078f19 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2022-50240)Record last updated .