263 lines
14 KiB
JSON
263 lines
14 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-2021-4454",
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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": "2025-02-26T02:29:43.631Z",
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"datePublished": "2025-03-27T16:37:09.381Z",
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"dateUpdated": "2026-10-15T21:21:06.266Z"
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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": "2026-08-05T08:44:58.812Z"
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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\ncan: j1939: fix errant WARN_ON_ONCE in j1939_session_deactivate\n\nThe conclusion \"j1939_session_deactivate() should be called with a\nsession ref-count of at least 2\" is incorrect. In some concurrent\nscenarios, j1939_session_deactivate can be called with the session\nref-count less than 2. But there is not any problem because it\nwill check the session active state before session putting in\nj1939_session_deactivate_locked().\n\nHere is the concurrent scenario of the problem reported by syzbot\nand my reproduction log.\n\n cpu0 cpu1\n j1939_xtp_rx_eoma\nj1939_xtp_rx_abort_one\n j1939_session_get_by_addr [kref == 2]\nj1939_session_get_by_addr [kref == 3]\nj1939_session_deactivate [kref == 2]\nj1939_session_put [kref == 1]\n\t\t\t\tj1939_session_completed\n\t\t\t\tj1939_session_deactivate\n\t\t\t\tWARN_ON_ONCE(kref < 2)\n\n=====================================================\nWARNING: CPU: 1 PID: 21 at net/can/j1939/transport.c:1088 j1939_session_deactivate+0x5f/0x70\nCPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 5.14.0-rc7+ #32\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014\nRIP: 0010:j1939_session_deactivate+0x5f/0x70\nCall Trace:\n j1939_session_deactivate_activate_next+0x11/0x28\n j1939_xtp_rx_eoma+0x12a/0x180\n j1939_tp_recv+0x4a2/0x510\n j1939_can_recv+0x226/0x380\n can_rcv_filter+0xf8/0x220\n can_receive+0x102/0x220\n ? process_backlog+0xf0/0x2c0\n can_rcv+0x53/0xf0\n __netif_receive_skb_one_core+0x67/0x90\n ? process_backlog+0x97/0x2c0\n __netif_receive_skb+0x22/0x80"
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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 WARN fires on the packet receive path (can_rcv → j1939_can_recv → j1939_tp_recv → j1939_xtp_rx_eoma/abort → j1939_session_deactivate). An unauthenticated CAN/J1939 peer can trigger it without local code on the target, consistent with other packet-triggered j1939 scores (e.g. CVE-2023-52887, CVE-2026-22997).\nAC:L - The attacker controls both sides of the race by injecting concurrent TP.CM EOMA and Abort frames for the same session; packet content and timing are fully attacker-influenced, so success does not depend on external conditions.\nPR:N - J1939/CAN receive processing has no authentication or credential check; once a legitimate J1939 socket is bound (normal deployment state), an unauthenticated bus peer can inject the crafted frame sequence.\nUI:N - Frames are processed automatically in softirq receive context; no victim or administrator action is required beyond the target already running the J1939 stack.\nS:U - Impact is confined to kernel J1939 session handling within the same host kernel authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The defect is only a spurious WARN_ON_ONCE; the concurrent deactivate path checks session active state before putting, and investigation found no info leak, OOB read, or UAF disclosure primitive.\nI:N - No out-of-bounds write, type confusion, or other integrity/write primitive exists—the fix only removes an incorrect assertion while leaving correct deactivate_locked behavior unchanged.\nA:H - WARN_ON_ONCE in softirq receive context can panic the kernel when panic_on_warn is set (and warn_limit exhaustion similarly), producing a denial of service inducible by an unauthenticated peer."
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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/can/j1939/transport.c"
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],
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"versions": [
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{
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"version": "7eef18c0479ba5d9f54fba30cd77c233ebca3eb1",
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"lessThan": "6950df42a03c9ac9290503ced3f371199cb68fa9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "55dd22c5d029423f513fd849e633adf0e9c10d0c",
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"lessThan": "b6d44072117bba057d50f7a2f96e5d070c65926d",
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"status": "affected",
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},
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{
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"version": "0c71437dd50dd687c15d8ca80b3b68f10bb21d63",
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{
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"version": "0c71437dd50dd687c15d8ca80b3b68f10bb21d63",
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"lessThan": "d0553680f94c49bbe0e39eb50d033ba563b4212d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5e1fc537c1be332aef9621ca9146aeb3ba59522f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.4.138",
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"lessThan": "5.4.232",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.10.56",
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"lessThan": "5.10.168",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.13.8",
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"lessThan": "5.14",
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"status": "affected",
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"versionType": "semver"
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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/can/j1939/transport.c"
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],
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"versions": [
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{
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"version": "5.14",
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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": "5.14",
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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": "5.4.232",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.168",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.93",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.11",
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"lessThanOrEqual": "6.1.*",
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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": "6.2",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.4.138",
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"versionEndExcluding": "5.4.232"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/6950df42a03c9ac9290503ced3f371199cb68fa9"
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},
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{
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"url": "https://git.kernel.org/stable/c/b6d44072117bba057d50f7a2f96e5d070c65926d"
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},
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{
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"url": "https://git.kernel.org/stable/c/9ab896775f98ff54b68512f345eed178bf961084"
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"url": "https://git.kernel.org/stable/c/1740a1e45eee65099a92fb502e1e67e63aad277d"
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{
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"url": "https://git.kernel.org/stable/c/d0553680f94c49bbe0e39eb50d033ba563b4212d"
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}
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],
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"title": "can: j1939: fix errant WARN_ON_ONCE in j1939_session_deactivate",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2021-4454",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:02:43.206452Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T21:21:06.266Z"
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}
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}
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]
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}
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} |