CVE-2021-47245
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)
netfilter: synproxy: Fix out of bounds when parsing TCP options
In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: Fix out of bounds when parsing TCP options The TCP option parser in synproxy (synproxy_parse_options) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1. This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options."). v2 changes: Added an early return when length < 0 to avoid calling skb_header_pointer with negative length.
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) |
|---|---|---|---|---|---|
| 48b1de4c110a7afa4b85862f6c75af817db26fad | affected | git | e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 | Unavailable | None listed |
| 48b1de4c110a7afa4b85862f6c75af817db26fad | affected | git | 576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 | Unavailable | None listed |
| 48b1de4c110a7afa4b85862f6c75af817db26fad | affected | git | 674b5f0c6a4fc5d3abce877048290cea6091fcb1 | Unavailable | None listed |
| 48b1de4c110a7afa4b85862f6c75af817db26fad | affected | git | 7d9a9a1a88a3da574e019b4de756bc73337b3b0b | Unavailable | None listed |
| 48b1de4c110a7afa4b85862f6c75af817db26fad | affected | git | 6defc77d48eff74075b80ad5925061b2fc010d98 | Unavailable | None listed |
| 48b1de4c110a7afa4b85862f6c75af817db26fad | affected | git | 9cdf299ba4e153b5e56187648420de22c6216f02 | Unavailable | None listed |
| 48b1de4c110a7afa4b85862f6c75af817db26fad | affected | git | f648089337cb8ed40b2bb96e244f72b9d97dc96b | Unavailable | None listed |
| 48b1de4c110a7afa4b85862f6c75af817db26fad | affected | git | 5fc177ab759418c9537433e63301096e733fb915 | 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) |
|---|---|---|---|---|---|
| 3.12 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.12 | Unavailable | None listed |
| 4.4.274 | unaffected | semver | Unavailable | 4.4.* | None listed |
| 4.9.274 | unaffected | semver | Unavailable | 4.9.* | None listed |
| 4.14.238 | unaffected | semver | Unavailable | 4.14.* | None listed |
| 4.19.196 | unaffected | semver | Unavailable | 4.19.* | None listed |
| 5.4.128 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.46 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.12.13 | unaffected | semver | Unavailable | 5.12.* | None listed |
| 5.13 | unaffected | original_commit_for_fix | Unavailable | * | None listed |