CVE-2024-35920 (GCVE-0-2024-35920)
Vulnerability from cvelistv5
Published
2024-05-19 10:10
Modified
2026-08-05 11:30
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: media: mediatek: vcodec: adding lock to protect decoder context list Add a lock for the ctx_list, to avoid accessing a NULL pointer within the 'vpu_dec_ipi_handler' function when the ctx_list has been deleted due to an unexpected behavior on the SCP IP block. Hardware name: Google juniper sku16 board (DT) pstate: 20400005 (nzCv daif +PAN -UAO -TCO BTYPE=--) pc : vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec] lr : scp_ipi_handler+0xd0/0x194 [mtk_scp] sp : ffffffc0131dbbd0 x29: ffffffc0131dbbd0 x28: 0000000000000000 x27: ffffff9bb277f348 x26: ffffff9bb242ad00 x25: ffffffd2d440d3b8 x24: ffffffd2a13ff1d4 x23: ffffff9bb7fe85a0 x22: ffffffc0133fbdb0 x21: 0000000000000010 x20: ffffff9b050ea328 x19: ffffffc0131dbc08 x18: 0000000000001000 x17: 0000000000000000 x16: ffffffd2d461c6e0 x15: 0000000000000242 x14: 000000000000018f x13: 000000000000004d x12: 0000000000000000 x11: 0000000000000001 x10: fffffffffffffff0 x9 : ffffff9bb6e793a8 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : fffffffffffffff0 x3 : 0000000000000020 x2 : ffffff9bb6e79080 x1 : 0000000000000010 x0 : ffffffc0131dbc08 Call trace: vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec (HASH:6c3f 2)] scp_ipi_handler+0xd0/0x194 [mtk_scp (HASH:7046 3)] mt8183_scp_irq_handler+0x44/0x88 [mtk_scp (HASH:7046 3)] scp_irq_handler+0x48/0x90 [mtk_scp (HASH:7046 3)] irq_thread_fn+0x38/0x94 irq_thread+0x100/0x1c0 kthread+0x140/0x1fc ret_from_fork+0x10/0x30 Code: 54000088 f94ca50a eb14015f 54000060 (f9400108) ---[ end trace ace43ce36cbd5c93 ]--- Kernel panic - not syncing: Oops: Fatal exception SMP: stopping secondary CPUs Kernel Offset: 0x12c4000000 from 0xffffffc010000000 PHYS_OFFSET: 0xffffffe580000000 CPU features: 0x08240002,2188200c Memory Limit: none
References
Impacted products
Vendor Product Version
Linux Linux Version: 655b86e52eacdce79c2e02c5ec7258a97fcc2e4a
Version: 655b86e52eacdce79c2e02c5ec7258a97fcc2e4a
Version: 655b86e52eacdce79c2e02c5ec7258a97fcc2e4a
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mediatek: vcodec: adding lock to protect decoder context list\n\nAdd a lock for the ctx_list, to avoid accessing a NULL pointer\nwithin the \u0027vpu_dec_ipi_handler\u0027 function when the ctx_list has\nbeen deleted due to an unexpected behavior on the SCP IP block.\n\nHardware name: Google juniper sku16 board (DT)\npstate: 20400005 (nzCv daif +PAN -UAO -TCO BTYPE=--)\npc : vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec]\nlr : scp_ipi_handler+0xd0/0x194 [mtk_scp]\nsp : ffffffc0131dbbd0\nx29: ffffffc0131dbbd0 x28: 0000000000000000\nx27: ffffff9bb277f348 x26: ffffff9bb242ad00\nx25: ffffffd2d440d3b8 x24: ffffffd2a13ff1d4\nx23: ffffff9bb7fe85a0 x22: ffffffc0133fbdb0\nx21: 0000000000000010 x20: ffffff9b050ea328\nx19: ffffffc0131dbc08 x18: 0000000000001000\nx17: 0000000000000000 x16: ffffffd2d461c6e0\nx15: 0000000000000242 x14: 000000000000018f\nx13: 000000000000004d x12: 0000000000000000\nx11: 0000000000000001 x10: fffffffffffffff0\nx9 : ffffff9bb6e793a8 x8 : 0000000000000000\nx7 : 0000000000000000 x6 : 000000000000003f\nx5 : 0000000000000040 x4 : fffffffffffffff0\nx3 : 0000000000000020 x2 : ffffff9bb6e79080\nx1 : 0000000000000010 x0 : ffffffc0131dbc08\nCall trace:\nvpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec (HASH:6c3f 2)]\nscp_ipi_handler+0xd0/0x194 [mtk_scp (HASH:7046 3)]\nmt8183_scp_irq_handler+0x44/0x88 [mtk_scp (HASH:7046 3)]\nscp_irq_handler+0x48/0x90 [mtk_scp (HASH:7046 3)]\nirq_thread_fn+0x38/0x94\nirq_thread+0x100/0x1c0\nkthread+0x140/0x1fc\nret_from_fork+0x10/0x30\nCode: 54000088 f94ca50a eb14015f 54000060 (f9400108)\n---[ end trace ace43ce36cbd5c93 ]---\nKernel panic - not syncing: Oops: Fatal exception\nSMP: stopping secondary CPUs\nKernel Offset: 0x12c4000000 from 0xffffffc010000000\nPHYS_OFFSET: 0xffffffe580000000\nCPU features: 0x08240002,2188200c\nMemory Limit: none"
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There is no network-facing path into `vpu_dec_check_ap_inst()`.\\nAC:L - The attacker controls both sides of the race \\u2014 an `open()`/`close()` loop mutates the shared `dev-\u003ectx_list` while decode jobs it submitted drive the SCP IPI ACKs that enter the unlocked `list_for_each_entry()`. It can also deterministically widen the window by opening many contexts and by forcing the 2000 ms `scp_ipi_send()` ACK timeout so late ACKs arrive after the context was freed.\\nPR:L - `fops_vcodec_open()` enforces no capability check; any local user with access to the `/dev/video*` node (video group, and the sandboxed media/GPU processes on ChromeOS and Android that routinely hold it) can reach it. No root or CAP_* privilege is needed.\\nUI:N - The attacking process performs every step itself \\u2014 opening the decoder, submitting a bitstream, and closing the fd concurrently. 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That is a use-after-free write at fixed offsets, exploitable for cross-object corruption and control-flow hijack.\\nA:H - The commit records a reproduced fatal oops in `vpu_dec_ipi_handler+0x58` ending in \\\"Kernel panic - not syncing: Oops: Fatal exception\\\" with secondary CPUs stopped. Any local user able to open the decoder node can trigger this repeatedly for a full system crash.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"655b86e52eacdce79c2e02c5ec7258a97fcc2e4a\", \"lessThan\": \"0a2dc707aa42214f9c4827bd57e344e29a0841d6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"655b86e52eacdce79c2e02c5ec7258a97fcc2e4a\", \"lessThan\": \"23aaf824121055ba81b55f75444355bd83c8eb38\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"655b86e52eacdce79c2e02c5ec7258a97fcc2e4a\", \"lessThan\": \"6467cda18c9f9b5f2f9a0aa1e2861c653e41f382\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c\", \"drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c\", \"drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h\", \"drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.27\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c\", \"drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c\", \"drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h\", \"drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/0a2dc707aa42214f9c4827bd57e344e29a0841d6\"}, {\"url\": \"https://git.kernel.org/stable/c/23aaf824121055ba81b55f75444355bd83c8eb38\"}, {\"url\": \"https://git.kernel.org/stable/c/6467cda18c9f9b5f2f9a0aa1e2861c653e41f382\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmedia: mediatek: vcodec: adding lock to protect decoder context list\\n\\nAdd a lock for the ctx_list, to avoid accessing a NULL pointer\\nwithin the \u0027vpu_dec_ipi_handler\u0027 function when the ctx_list has\\nbeen deleted due to an unexpected behavior on the SCP IP block.\\n\\nHardware name: Google juniper sku16 board (DT)\\npstate: 20400005 (nzCv daif +PAN -UAO -TCO BTYPE=--)\\npc : vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec]\\nlr : scp_ipi_handler+0xd0/0x194 [mtk_scp]\\nsp : ffffffc0131dbbd0\\nx29: ffffffc0131dbbd0 x28: 0000000000000000\\nx27: ffffff9bb277f348 x26: ffffff9bb242ad00\\nx25: ffffffd2d440d3b8 x24: ffffffd2a13ff1d4\\nx23: ffffff9bb7fe85a0 x22: ffffffc0133fbdb0\\nx21: 0000000000000010 x20: ffffff9b050ea328\\nx19: ffffffc0131dbc08 x18: 0000000000001000\\nx17: 0000000000000000 x16: ffffffd2d461c6e0\\nx15: 0000000000000242 x14: 000000000000018f\\nx13: 000000000000004d x12: 0000000000000000\\nx11: 0000000000000001 x10: fffffffffffffff0\\nx9 : ffffff9bb6e793a8 x8 : 0000000000000000\\nx7 : 0000000000000000 x6 : 000000000000003f\\nx5 : 0000000000000040 x4 : fffffffffffffff0\\nx3 : 0000000000000020 x2 : ffffff9bb6e79080\\nx1 : 0000000000000010 x0 : ffffffc0131dbc08\\nCall trace:\\nvpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec (HASH:6c3f 2)]\\nscp_ipi_handler+0xd0/0x194 [mtk_scp (HASH:7046 3)]\\nmt8183_scp_irq_handler+0x44/0x88 [mtk_scp (HASH:7046 3)]\\nscp_irq_handler+0x48/0x90 [mtk_scp (HASH:7046 3)]\\nirq_thread_fn+0x38/0x94\\nirq_thread+0x100/0x1c0\\nkthread+0x140/0x1fc\\nret_from_fork+0x10/0x30\\nCode: 54000088 f94ca50a eb14015f 54000060 (f9400108)\\n---[ end trace ace43ce36cbd5c93 ]---\\nKernel panic - not syncing: Oops: Fatal exception\\nSMP: stopping secondary CPUs\\nKernel Offset: 0x12c4000000 from 0xffffffc010000000\\nPHYS_OFFSET: 0xffffffe580000000\\nCPU features: 0x08240002,2188200c\\nMemory Limit: none\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.27\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.6\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:30:59.577Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35920\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:30:59.577Z\", \"dateReserved\": \"2024-05-17T13:50:33.124Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-19T10:10:32.379Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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