CVE-2021-4454 (GCVE-0-2021-4454)
Vulnerability from cvelistv5
Published
2025-03-27 16:37
Modified
2026-10-15 21:21
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix errant WARN_ON_ONCE in j1939_session_deactivate The conclusion "j1939_session_deactivate() should be called with a session ref-count of at least 2" is incorrect. In some concurrent scenarios, j1939_session_deactivate can be called with the session ref-count less than 2. But there is not any problem because it will check the session active state before session putting in j1939_session_deactivate_locked(). Here is the concurrent scenario of the problem reported by syzbot and my reproduction log. cpu0 cpu1 j1939_xtp_rx_eoma j1939_xtp_rx_abort_one j1939_session_get_by_addr [kref == 2] j1939_session_get_by_addr [kref == 3] j1939_session_deactivate [kref == 2] j1939_session_put [kref == 1] j1939_session_completed j1939_session_deactivate WARN_ON_ONCE(kref < 2) ===================================================== WARNING: CPU: 1 PID: 21 at net/can/j1939/transport.c:1088 j1939_session_deactivate+0x5f/0x70 CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 5.14.0-rc7+ #32 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 RIP: 0010:j1939_session_deactivate+0x5f/0x70 Call Trace: j1939_session_deactivate_activate_next+0x11/0x28 j1939_xtp_rx_eoma+0x12a/0x180 j1939_tp_recv+0x4a2/0x510 j1939_can_recv+0x226/0x380 can_rcv_filter+0xf8/0x220 can_receive+0x102/0x220 ? process_backlog+0xf0/0x2c0 can_rcv+0x53/0xf0 __netif_receive_skb_one_core+0x67/0x90 ? process_backlog+0x97/0x2c0 __netif_receive_skb+0x22/0x80
References
Impacted products
Vendor Product Version
Linux Linux Version: 7eef18c0479ba5d9f54fba30cd77c233ebca3eb1
Version: 55dd22c5d029423f513fd849e633adf0e9c10d0c
Version: 0c71437dd50dd687c15d8ca80b3b68f10bb21d63
Version: 0c71437dd50dd687c15d8ca80b3b68f10bb21d63
Version: 0c71437dd50dd687c15d8ca80b3b68f10bb21d63
Version: 5e1fc537c1be332aef9621ca9146aeb3ba59522f
Version: 5.4.138   ≤
Version: 5.10.56   ≤
Version: 5.13.8   ≤
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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 \u003c 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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.232\", \"versionStartIncluding\": \"5.4.138\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.168\", \"versionStartIncluding\": \"5.10.56\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.93\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.11\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.13.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:44:58.812Z\"}}}",
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Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.