CVE-2026-98621
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
net: gue: reject invalid REMCSUM offsets
In the Linux kernel, the following vulnerability has been resolved: net: gue: reject invalid REMCSUM offsets The REMCSUM option carries an absolute checksum start and checksum field offset. gue_remcsum() passes them to skb_remcsum_process(), whose partial path stores offset - start in the u16 skb->csum_offset variable. If offset is less than start, this underflows. A forwarded packet can retain CHECKSUM_PARTIAL and reach a NETIF_F_HW_CSUM driver which trusts the metadata, leading skb_copy_and_csum_dev() to write two bytes about 64 KiB beyond the destination buffer. Reject reversed tuples in validate_gue_flags(), after the existing length validation, so all GUE parsers enforce the ordering in one place.
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) |
|---|---|---|---|---|---|
| fe881ef11cf0220f118816181930494d484c4883 | affected | git | 4b9bc21b2396c396d88dd909caaf73d5be6ff593 | Unavailable | None listed |
| fe881ef11cf0220f118816181930494d484c4883 | affected | git | 43efb1f997e976f386aa89716f55870cd2cff9ad | Unavailable | None listed |
| fe881ef11cf0220f118816181930494d484c4883 | affected | git | 1eeec0c51fd5598da44080ed96bbd9880021c28b | Unavailable | None listed |
| fe881ef11cf0220f118816181930494d484c4883 | affected | git | 1d664be4ca49d1696e85239236f4988dfc4653c3 | Unavailable | None listed |
| fe881ef11cf0220f118816181930494d484c4883 | affected | git | 97f907203321eee2cc9132d5c9eb47698fb41d35 | Unavailable | None listed |
| fe881ef11cf0220f118816181930494d484c4883 | affected | git | 40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f | Unavailable | None listed |
| fe881ef11cf0220f118816181930494d484c4883 | affected | git | c20f755338ca234e523dfc943719f194dfc1f903 | Unavailable | None listed |
| fe881ef11cf0220f118816181930494d484c4883 | affected | git | 2566866fc30965d915d0b52b5c3323b362619f0e | 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) |
|---|---|---|---|---|---|
| 4.0 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.0 | Unavailable | None listed |
| 5.10.271 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.222 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.189 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.158 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.112 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.55 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.9 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |