CVE-2026-31570 (GCVE-0-2026-31570)
Vulnerability from cvelistv5
Published
2026-04-24 14:35
Modified
2026-10-19 18:55
Severity ?
8.8 (High) - CVSS:3.1/AV:A/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: 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 456a8a646b2563438c16a9b27decf9aa717f1ebb
Version: 456a8a646b2563438c16a9b27decf9aa717f1ebb
Version: 456a8a646b2563438c16a9b27decf9aa717f1ebb
Version: 456a8a646b2563438c16a9b27decf9aa717f1ebb
Version: 456a8a646b2563438c16a9b27decf9aa717f1ebb
Version: 456a8a646b2563438c16a9b27decf9aa717f1ebb
Version: 456a8a646b2563438c16a9b27decf9aa717f1ebb
Version: 456a8a646b2563438c16a9b27decf9aa717f1ebb
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: gw: fix OOB heap access in cgw_csum_crc8_rel()\n\ncgw_csum_crc8_rel() correctly computes bounds-safe indices via calc_idx():\n\n    int from = calc_idx(crc8-\u003efrom_idx, cf-\u003elen);\n    int to   = calc_idx(crc8-\u003eto_idx,   cf-\u003elen);\n    int res  = calc_idx(crc8-\u003eresult_idx, cf-\u003elen);\n\n    if (from \u003c 0 || to \u003c 0 || res \u003c 0)\n        return;\n\nHowever, the loop and the result write then use the raw s8 fields directly\ninstead of the computed variables:\n\n    for (i = crc8-\u003efrom_idx; ...)        /* BUG: raw negative index */\n    cf-\u003edata[crc8-\u003eresult_idx] = ...;    /* BUG: raw negative index */\n\nWith from_idx = to_idx = result_idx = -64 on a 64-byte CAN FD frame,\ncalc_idx(-64, 64) = 0 so the guard passes, but the loop iterates with\ni = -64, reading cf-\u003edata[-64], and the write goes to cf-\u003edata[-64].\nThis write might end up to 56 (7.0-rc) or 40 (\u003c= 6.19) bytes before the\nstart of the canfd_frame on the heap.\n\nThe companion function cgw_csum_xor_rel() uses `from`/`to`/`res`\ncorrectly throughout; fix cgw_csum_crc8_rel() to match.\n\nConfirmed with KASAN on linux-7.0-rc2:\n  BUG: KASAN: slab-out-of-bounds in cgw_csum_crc8_rel+0x515/0x5b0\n  Read of size 1 at addr ffff8880076619c8 by task poc_cgw_oob/62\n\nTo configure the can-gw crc8 checksums CAP_NET_ADMIN is needed."
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              "value": "AV:A - The vulnerable function runs in the CAN gateway receive path for CAN/CAN FD frames, after a matching gateway rule processes traffic. In a reasonable automotive or industrial CAN gateway deployment, an attacker on the same CAN segment can send matching CAN FD frames, so this is Adjacent.\nAC:L - There is no race or probabilistic condition; once an affected CRC8 relative-index gateway rule exists, the attacker can choose CAN ID, payload length, and frame contents to trigger the bad negative index path reliably. A 64-byte CAN FD frame reaches the demonstrated OOB case directly.\nPR:N - No host privileges are required to inject trigger CAN FD traffic into an already configured gateway route on the CAN segment. Creating or changing the rule requires CAP_NET_ADMIN in init_user_ns, but the highest reasonable deployed gateway scenario only requires attacker-controlled bus traffic.\nUI:N - No victim user action is required after the affected gateway configuration is present. The vulnerable code runs automatically while processing matching CAN FD frames.\nS:U - The impact is within the same kernel security authority as the vulnerable CAN gateway code. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug performs out-of-bounds heap reads before the CAN FD frame while computing CRC8. Because this is kernel heap memory exposure potential from memory corruption, confidentiality impact is High.\nI:H - The bug performs an out-of-bounds heap write through cf-\u003edata[result_idx] using a raw negative index. Kernel heap corruption is defensibly exploitable for integrity compromise, so integrity impact is High.\nA:H - KASAN confirms a slab-out-of-bounds access in the receive path, and repeated crafted frames can trigger kernel memory corruption. This can crash or destabilize the kernel, so availability impact is High."
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    "datePublished": "2026-04-24T14:35:49.435Z",
    "dateReserved": "2026-03-09T15:48:24.117Z",
    "dateUpdated": "2026-10-19T18:55:59.285Z",
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In a reasonable automotive or industrial CAN gateway deployment, an attacker on the same CAN segment can send matching CAN FD frames, so this is Adjacent.\\nAC:L - There is no race or probabilistic condition; once an affected CRC8 relative-index gateway rule exists, the attacker can choose CAN ID, payload length, and frame contents to trigger the bad negative index path reliably. A 64-byte CAN FD frame reaches the demonstrated OOB case directly.\\nPR:N - No host privileges are required to inject trigger CAN FD traffic into an already configured gateway route on the CAN segment. Creating or changing the rule requires CAP_NET_ADMIN in init_user_ns, but the highest reasonable deployed gateway scenario only requires attacker-controlled bus traffic.\\nUI:N - No victim user action is required after the affected gateway configuration is present. The vulnerable code runs automatically while processing matching CAN FD frames.\\nS:U - The impact is within the same kernel security authority as the vulnerable CAN gateway code. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\\nC:H - The bug performs out-of-bounds heap reads before the CAN FD frame while computing CRC8. Because this is kernel heap memory exposure potential from memory corruption, confidentiality impact is High.\\nI:H - The bug performs an out-of-bounds heap write through cf-\u003edata[result_idx] using a raw negative index. Kernel heap corruption is defensibly exploitable for integrity compromise, so integrity impact is High.\\nA:H - KASAN confirms a slab-out-of-bounds access in the receive path, and repeated crafted frames can trigger kernel memory corruption. This can crash or destabilize the kernel, so availability impact is High.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"456a8a646b2563438c16a9b27decf9aa717f1ebb\", \"lessThan\": \"e7c99348b0612b2bc02d5ce6ff9873261cc7605f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"456a8a646b2563438c16a9b27decf9aa717f1ebb\", \"lessThan\": \"999ca48d55a8a46da21519db7e834e5867200379\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"456a8a646b2563438c16a9b27decf9aa717f1ebb\", \"lessThan\": \"a025283d7f7404c739225e457fb99db2368bb544\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"456a8a646b2563438c16a9b27decf9aa717f1ebb\", \"lessThan\": \"54ecdf76a55e75c1f5085e440f8ab671a3283ef5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"456a8a646b2563438c16a9b27decf9aa717f1ebb\", \"lessThan\": \"c4e8eaa75fa0b6bcbfa5356d6195c4ad0e05e57a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"456a8a646b2563438c16a9b27decf9aa717f1ebb\", \"lessThan\": \"84f8b76d24273175a22713e83e90874e1880d801\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"456a8a646b2563438c16a9b27decf9aa717f1ebb\", \"lessThan\": \"66b689efd08227da2c5ca49b58b30a95d23c695a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"456a8a646b2563438c16a9b27decf9aa717f1ebb\", \"lessThan\": \"b9c310d72783cc2f30d103eed83920a5a29c671a\", \"versionType\": \"git\"}], \"programFiles\": [\"net/can/gw.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.253\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.203\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.131\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.80\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/can/gw.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e7c99348b0612b2bc02d5ce6ff9873261cc7605f\"}, {\"url\": \"https://git.kernel.org/stable/c/999ca48d55a8a46da21519db7e834e5867200379\"}, {\"url\": \"https://git.kernel.org/stable/c/a025283d7f7404c739225e457fb99db2368bb544\"}, {\"url\": \"https://git.kernel.org/stable/c/54ecdf76a55e75c1f5085e440f8ab671a3283ef5\"}, {\"url\": \"https://git.kernel.org/stable/c/c4e8eaa75fa0b6bcbfa5356d6195c4ad0e05e57a\"}, {\"url\": \"https://git.kernel.org/stable/c/84f8b76d24273175a22713e83e90874e1880d801\"}, {\"url\": \"https://git.kernel.org/stable/c/66b689efd08227da2c5ca49b58b30a95d23c695a\"}, {\"url\": \"https://git.kernel.org/stable/c/b9c310d72783cc2f30d103eed83920a5a29c671a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncan: gw: fix OOB heap access in cgw_csum_crc8_rel()\\n\\ncgw_csum_crc8_rel() correctly computes bounds-safe indices via calc_idx():\\n\\n    int from = calc_idx(crc8-\u003efrom_idx, cf-\u003elen);\\n    int to   = calc_idx(crc8-\u003eto_idx,   cf-\u003elen);\\n    int res  = calc_idx(crc8-\u003eresult_idx, cf-\u003elen);\\n\\n    if (from \u003c 0 || to \u003c 0 || res \u003c 0)\\n        return;\\n\\nHowever, the loop and the result write then use the raw s8 fields directly\\ninstead of the computed variables:\\n\\n    for (i = crc8-\u003efrom_idx; ...)        /* BUG: raw negative index */\\n    cf-\u003edata[crc8-\u003eresult_idx] = ...;    /* BUG: raw negative index */\\n\\nWith from_idx = to_idx = result_idx = -64 on a 64-byte CAN FD frame,\\ncalc_idx(-64, 64) = 0 so the guard passes, but the loop iterates with\\ni = -64, reading cf-\u003edata[-64], and the write goes to cf-\u003edata[-64].\\nThis write might end up to 56 (7.0-rc) or 40 (\u003c= 6.19) bytes before the\\nstart of the canfd_frame on the heap.\\n\\nThe companion function cgw_csum_xor_rel() uses `from`/`to`/`res`\\ncorrectly throughout; fix cgw_csum_crc8_rel() to match.\\n\\nConfirmed with KASAN on linux-7.0-rc2:\\n  BUG: KASAN: slab-out-of-bounds in cgw_csum_crc8_rel+0x515/0x5b0\\n  Read of size 1 at addr ffff8880076619c8 by task poc_cgw_oob/62\\n\\nTo configure the can-gw crc8 checksums CAP_NET_ADMIN is needed.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.253\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.203\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.168\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.131\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.80\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.21\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.11\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"5.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:23:34.970Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31570\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:55:59.285Z\", \"dateReserved\": \"2026-03-09T15:48:24.117Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-24T14:35:49.435Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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