Answer in brief
CVE-2026-31570 records a High severity (CVSS 8.8) vulnerability in can: gw: fix OOB heap access in cgw_csum_crc8_rel(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=456a8a646b2563438c16a9b27decf9aa717f1ebb <e7c99348b0612b2bc02d5ce6ff9873261cc7605f || >=456a8a646b2563438c16a9b27decf9aa717f1ebb <999ca48d55a8a46da21519db7e834e5867200379 || >=456a8a646b2563438c16a9b27decf9aa717f1ebb <a025283d7f7404c739225e457fb99db2368bb544 || >=456a8a646b2563438c16a9b27decf9aa717f1ebb <54ecdf76a55e75c1f5085e440f8ab671a3283ef5 || >=456a8a646b2563438c16a9b27decf9aa717f1ebb <c4e8eaa75fa0b6bcbfa5356d6195c4ad0e05e57a || >=456a8a646b2563438c16a9b27decf9aa717f1ebb <84f8b76d24273175a22713e83e90874e1880d801 || >=456a8a646b2563438c16a9b27decf9aa717f1ebb <66b689efd08227da2c5ca49b58b30a95d23c695a || >=456a8a646b2563438c16a9b27decf9aa717f1ebb <b9c310d72783cc2f30d103eed83920a5a29c671a | e7c99348b0612b2bc02d5ce6ff9873261cc7605f, 999ca48d55a8a46da21519db7e834e5867200379, a025283d7f7404c739225e457fb99db2368bb544, 54ecdf76a55e75c1f5085e440f8ab671a3283ef5, c4e8eaa75fa0b6bcbfa5356d6195c4ad0e05e57a, 84f8b76d24273175a22713e83e90874e1880d801, 66b689efd08227da2c5ca49b58b30a95d23c695a, b9c310d72783cc2f30d103eed83920a5a29c671a |
| Linux/Linuxgeneric | 5.4 | Not reported |
Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
In the Linux kernel, the following vulnerability has been resolved: can: gw: fix OOB heap access in cgw_csum_crc8_rel() cgw_csum_crc8_rel() correctly computes bounds-safe indices via calc_idx(): int from = calc_idx(crc8->from_idx, cf->len); int to = calc_idx(crc8->to_idx, cf->len); int res = calc_idx(crc8->result_idx, cf->len); if (from < 0 || to < 0 || res < 0) return; However, the loop and the result write then use the raw s8 fields directly instead of the computed variables: for (i = crc8->from_idx; ...) /* BUG: raw negative index */ cf->data[crc8->result_idx] = ...; /* BUG: raw negative index */ With from_idx = to_idx = result_idx = -64 on a 64-byte CAN FD frame, calc_idx(-64, 64) = 0 so the guard passes, but the loop iterates with i = -64, reading cf->data[-64], and the write goes to cf->data[-64]. This write might end up to 56 (7.0-rc) or 40 (<= 6.19) bytes before the start of the canfd_frame on the heap. The companion function cgw_csum_xor_rel() uses `from`/`to`/`res` correctly throughout; fix cgw_csum_crc8_rel() to match. Confirmed with KASAN on linux-7.0-rc2: BUG: KASAN: slab-out-of-bounds in cgw_csum_crc8_rel+0x515/0x5b0 Read of size 1 at addr ffff8880076619c8 by task poc_cgw_oob/62 To configure the can-gw crc8 checksums CAP_NET_ADMIN is needed.
Quoted source text, attributed separately from HOL analysis.