138 lines
7.3 KiB
JSON
138 lines
7.3 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-39962",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.149Z",
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"datePublished": "2025-10-09T12:13:22.684Z",
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"dateUpdated": "2026-08-05T12:06:31.023Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:06:31.023Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix untrusted unsigned subtract\n\nFix the following Smatch static checker warning:\n\n net/rxrpc/rxgk_app.c:65 rxgk_yfs_decode_ticket()\n warn: untrusted unsigned subtract. 'ticket_len - 10 * 4'\n\nby prechecking the length of what we're trying to extract in two places in\nthe token and decoding for a response packet.\n\nAlso use sizeof() on the struct we're extracting rather specifying the size\nnumerically to be consistent with the other related statements."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The vulnerable code parses RxGK RESPONSE packets received over UDP by an rxrpc server connection; the AFS cache manager (present on every kafs client) exposes this path to remote peers on the network.\nAC:L - A single crafted RESPONSE packet with a small token_len and oversized ticket_len reliably bypasses the check and triggers the crash; the required server key exists by default on the CM and kvno/enctype are standard, with no attacker-uncontrolled conditions.\nPR:N - The malformed length is processed during the challenge/response handshake (CONN_SERVICE_CHALLENGING), before any credential is verified, so no authentication or privileges are required.\nUI:N - Exploitation is fully driven by attacker-sent network packets; no action by any local user is needed.\nS:U - The impact is confined to the kernel that processes the packet; no crossing of a security/authority boundary such as VM or IOMMU escape occurs.\nC:N - The reliably reachable path is a BUG_ON crash with no data returned to the attacker; the OOB-read variant requires server-key knowledge to control decrypted content and its data is stored in a no-leak key, so there is no defensible information disclosure.\nI:N - The reachable outcome is a kernel panic in skb_to_sgvec; the length-check bypass does not yield an attacker-controlled write primitive (the payload allocation scales with the corrupted length), so no data modification results.\nA:H - The oversized attacker-controlled length reaches skb_to_sgvec and triggers BUG_ON(len), causing a kernel panic — a remote, unauthenticated denial of service."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/rxrpc/rxgk_app.c"
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],
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"versions": [
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{
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"version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
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"lessThan": "71571e187106631a8127f2dde780f35caa358d33",
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"status": "affected",
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"versionType": "git"
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},
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{
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/rxrpc/rxgk_app.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.16.9",
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"lessThanOrEqual": "6.16.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.16.9"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/71571e187106631a8127f2dde780f35caa358d33"
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},
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{
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"url": "https://git.kernel.org/stable/c/2429a197648178cd4dc930a9d87c13c547460564"
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}
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],
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"title": "rxrpc: Fix untrusted unsigned subtract",
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"x_generator": {
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