CVE-2026-72351
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved:
gue: validate REMCSUM private option length
GUE private flags can indicate that remote checksum offload metadata is present. The private flags field itself is accounted for by guehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even when GUE_PFLAG_REMCSUM is set.
This lets a packet with only the private flags field pass validate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum() read the missing REMCSUM start/offset fields from the following bytes.
Account for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that malformed packets are rejected during option validation.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 158b9995d3c87f3b93f5c22df54a12e12a3438b3 | affected |
| Linux | Linux | c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 7c6876ec1b227261b51803f784c7be1b2242a1a0 | affected |
| Linux | Linux | c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 2c4de9988e9ddc760b750d6b6e701c35ff60ad14 | affected |
| Linux | Linux | c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 2a99224c120823987e4d829726f4ecb33e03fc1e | affected |
| Linux | Linux | c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 61e78679c7c9ca685bff58e4b6348304dc60aafd | affected |
| Linux | Linux | c1aa8347e73e4092411fbd96cc59531fb7e76d04 < 4a4a1d41c6e901e773bcf795f562a47fa71f692a | affected |
| Linux | Linux | c1aa8347e73e4092411fbd96cc59531fb7e76d04 < f618cbe9b24cd0202004d2db781d5f80ab77037f | affected |
| Linux | Linux | c1aa8347e73e4092411fbd96cc59531fb7e76d04 < d335dcc6f521571d57117b8deeebc940836e5450 | affected |
| Linux | Linux | 3.19 | affected |
| Linux | Linux | 0 < 3.19 | unaffected |
| Linux | Linux | 5.10.261 <= 5.10.* | unaffected |
| Linux | Linux | 5.15.212 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.178 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.145 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.97 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.40 <= 6.18.* | unaffected |
| Linux | Linux | 7.1.5 <= 7.1.* | unaffected |
| Linux | Linux | 7.2 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3
- https://git.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0
- https://git.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14
- https://git.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e
- https://git.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd
- https://git.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a
- https://git.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f
- https://git.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450
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