CVE-2021-47649
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
udmabuf: validate ubuf->pagecount
In the Linux kernel, the following vulnerability has been resolved: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR. ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR. Fix it by validating ubuf->pagecount before passing it to kmalloc_array().
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| fbb0de795078190a9834b3409e4b009cfb18a6d4 | affected | git | 5d50f851dd307c07ca5591297093f19967c834a9 | Unavailable | None listed |
| fbb0de795078190a9834b3409e4b009cfb18a6d4 | affected | git | b267a8118c2b171bf7d67b90ed64154eeab9fae0 | Unavailable | None listed |
| fbb0de795078190a9834b3409e4b009cfb18a6d4 | affected | git | 811b667cefbea9cb7511a874b169d6a92907137e | Unavailable | None listed |
| fbb0de795078190a9834b3409e4b009cfb18a6d4 | affected | git | a3728d32fc61eb0fe283cb8ff60b2c8f751e2202 | Unavailable | None listed |
| fbb0de795078190a9834b3409e4b009cfb18a6d4 | affected | git | 9e9b4a269f84d3230f2af84ff42322db676440d9 | Unavailable | None listed |
| fbb0de795078190a9834b3409e4b009cfb18a6d4 | affected | git | 2b6dd600dd72573c23ea180b5b0b2f1813405882 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.20 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.20 | Unavailable | None listed |
| 5.4.189 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.110 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.33 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 5.16.19 | unaffected | semver | Unavailable | 5.16.* | None listed |
| 5.17.2 | unaffected | semver | Unavailable | 5.17.* | None listed |
| 5.18 | unaffected | original_commit_for_fix | Unavailable | * | None listed |