CVE-2022-49077
mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) If an mremap() syscall with old_size=0 ends up in move_page_tables(), it will call invalidate_range_start()/invalidate_range_end() unnecessarily, i.e. with an empty range. This causes a WARN in KVM's mmu_notifier. In the past, empty ranges have been diagnosed to be off-by-one bugs, hence the WARNing. Given the low (so far) number of unique reports, the benefits of detecting more buggy callers seem to outweigh the cost of having to fix cases such as this one, where userspace is doing something silly. In this particular case, an early return from move_page_tables() is enough to fix the issue.
Timeline
ID reserved
By Linux
Published
- 21 months later
· 21 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 |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 83% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < a05540f3903bd8295e8c4cd90dd3d416239a115b
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < eeaf28e2a0128147d687237e59d5407ee1b14693
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < e2c328c2a8f9de8b761bd4025b66c63120c55761
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < 7d659cb1763ff17d1c6ee082fa6feb4267c7a30b
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < 2358aa84ef6dafcf544a557caaa6b91afb4a0bd2
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < 04bc13dae4a27b8d030843c85ae452bb2f1d9c1f
- affected 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 – < 01e67e04c28170c47700c2c226d732bbfedb1ad0
- affected 3.2
- unaffected < 3.2
- unaffected 4.9.311 – ≤ 4.9.*
- unaffected 4.14.276 – ≤ 4.14.*
- unaffected 4.19.238 – ≤ 4.19.*
- unaffected 5.4.189 – ≤ 5.4.*
- unaffected 5.10.111 – ≤ 5.10.*
- unaffected 5.15.34 – ≤ 5.15.*
- unaffected 5.16.20 – ≤ 5.16.*
- unaffected 5.17.3 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References (9)
- https://git.kernel.org/stable/c/a05540f3903bd8295e8c4cd90dd3d416239a115b (opens in a new tab)
- https://git.kernel.org/stable/c/eeaf28e2a0128147d687237e59d5407ee1b14693 (opens in a new tab)
- https://git.kernel.org/stable/c/e2c328c2a8f9de8b761bd4025b66c63120c55761 (opens in a new tab)
- https://git.kernel.org/stable/c/c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31 (opens in a new tab)
- https://git.kernel.org/stable/c/7d659cb1763ff17d1c6ee082fa6feb4267c7a30b (opens in a new tab)
- https://git.kernel.org/stable/c/a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219 (opens in a new tab)
- https://git.kernel.org/stable/c/2358aa84ef6dafcf544a557caaa6b91afb4a0bd2 (opens in a new tab)
- https://git.kernel.org/stable/c/04bc13dae4a27b8d030843c85ae452bb2f1d9c1f (opens in a new tab)
- https://git.kernel.org/stable/c/01e67e04c28170c47700c2c226d732bbfedb1ad0 (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://trackcve.app/cve/CVE-2022-49077)Record last updated .