CVE-2024-26984 (GCVE-0-2024-26984)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:27 – Updated: 2025-11-04 17:15
VLAI?
Title
nouveau: fix instmem race condition around ptr stores
Summary
In the Linux kernel, the following vulnerability has been resolved: nouveau: fix instmem race condition around ptr stores Running a lot of VK CTS in parallel against nouveau, once every few hours you might see something like this crash. BUG: kernel NULL pointer dereference, address: 0000000000000008 PGD 8000000114e6e067 P4D 8000000114e6e067 PUD 109046067 PMD 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 7 PID: 53891 Comm: deqp-vk Not tainted 6.8.0-rc6+ #27 Hardware name: Gigabyte Technology Co., Ltd. Z390 I AORUS PRO WIFI/Z390 I AORUS PRO WIFI-CF, BIOS F8 11/05/2021 RIP: 0010:gp100_vmm_pgt_mem+0xe3/0x180 [nouveau] Code: c7 48 01 c8 49 89 45 58 85 d2 0f 84 95 00 00 00 41 0f b7 46 12 49 8b 7e 08 89 da 42 8d 2c f8 48 8b 47 08 41 83 c7 01 48 89 ee <48> 8b 40 08 ff d0 0f 1f 00 49 8b 7e 08 48 89 d9 48 8d 75 04 48 c1 RSP: 0000:ffffac20c5857838 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 00000000004d8001 RCX: 0000000000000001 RDX: 00000000004d8001 RSI: 00000000000006d8 RDI: ffffa07afe332180 RBP: 00000000000006d8 R08: ffffac20c5857ad0 R09: 0000000000ffff10 R10: 0000000000000001 R11: ffffa07af27e2de0 R12: 000000000000001c R13: ffffac20c5857ad0 R14: ffffa07a96fe9040 R15: 000000000000001c FS: 00007fe395eed7c0(0000) GS:ffffa07e2c980000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 000000011febe001 CR4: 00000000003706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ... ? gp100_vmm_pgt_mem+0xe3/0x180 [nouveau] ? gp100_vmm_pgt_mem+0x37/0x180 [nouveau] nvkm_vmm_iter+0x351/0xa20 [nouveau] ? __pfx_nvkm_vmm_ref_ptes+0x10/0x10 [nouveau] ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau] ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau] ? __lock_acquire+0x3ed/0x2170 ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau] nvkm_vmm_ptes_get_map+0xc2/0x100 [nouveau] ? __pfx_nvkm_vmm_ref_ptes+0x10/0x10 [nouveau] ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau] nvkm_vmm_map_locked+0x224/0x3a0 [nouveau] Adding any sort of useful debug usually makes it go away, so I hand wrote the function in a line, and debugged the asm. Every so often pt->memory->ptrs is NULL. This ptrs ptr is set in the nv50_instobj_acquire called from nvkm_kmap. If Thread A and Thread B both get to nv50_instobj_acquire around the same time, and Thread A hits the refcount_set line, and in lockstep thread B succeeds at refcount_inc_not_zero, there is a chance the ptrs value won't have been stored since refcount_set is unordered. Force a memory barrier here, I picked smp_mb, since we want it on all CPUs and it's write followed by a read. v2: use paired smp_rmb/smp_wmb.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: be55287aa5ba6895e9d4d3ed2f08a1be7a065957 , < bba8ec5e9b16649d85bc9e9086bf7ae5b5716ff9 (git)
Affected: be55287aa5ba6895e9d4d3ed2f08a1be7a065957 , < 1bc4825d4c3ec6abe43cf06c3c39d664d044cbf7 (git)
Affected: be55287aa5ba6895e9d4d3ed2f08a1be7a065957 , < 13d76b2f443dc371842916dd8768009ff1594716 (git)
Affected: be55287aa5ba6895e9d4d3ed2f08a1be7a065957 , < 3ab056814cd8ab84744c9a19ef51360b2271c572 (git)
Affected: be55287aa5ba6895e9d4d3ed2f08a1be7a065957 , < ad74d208f213c06d860916ad40f609ade8c13039 (git)
Affected: be55287aa5ba6895e9d4d3ed2f08a1be7a065957 , < a019b44b1bc6ed224c46fb5f88a8a10dd116e525 (git)
Affected: be55287aa5ba6895e9d4d3ed2f08a1be7a065957 , < 21ca9539f09360fd83654f78f2c361f2f5ddcb52 (git)
Affected: be55287aa5ba6895e9d4d3ed2f08a1be7a065957 , < fff1386cc889d8fb4089d285f883f8cba62d82ce (git)
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    Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 4.19.313 , ≤ 4.19.* (semver)
Unaffected: 5.4.275 , ≤ 5.4.* (semver)
Unaffected: 5.10.216 , ≤ 5.10.* (semver)
Unaffected: 5.15.157 , ≤ 5.15.* (semver)
Unaffected: 6.1.88 , ≤ 6.1.* (semver)
Unaffected: 6.6.29 , ≤ 6.6.* (semver)
Unaffected: 6.8.8 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnouveau: fix instmem race condition around ptr stores\n\nRunning a lot of VK CTS in parallel against nouveau, once every\nfew hours you might see something like this crash.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000008\nPGD 8000000114e6e067 P4D 8000000114e6e067 PUD 109046067 PMD 0\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 7 PID: 53891 Comm: deqp-vk Not tainted 6.8.0-rc6+ #27\nHardware name: Gigabyte Technology Co., Ltd. Z390 I AORUS PRO WIFI/Z390 I AORUS PRO WIFI-CF, BIOS F8 11/05/2021\nRIP: 0010:gp100_vmm_pgt_mem+0xe3/0x180 [nouveau]\nCode: c7 48 01 c8 49 89 45 58 85 d2 0f 84 95 00 00 00 41 0f b7 46 12 49 8b 7e 08 89 da 42 8d 2c f8 48 8b 47 08 41 83 c7 01 48 89 ee \u003c48\u003e 8b 40 08 ff d0 0f 1f 00 49 8b 7e 08 48 89 d9 48 8d 75 04 48 c1\nRSP: 0000:ffffac20c5857838 EFLAGS: 00010202\nRAX: 0000000000000000 RBX: 00000000004d8001 RCX: 0000000000000001\nRDX: 00000000004d8001 RSI: 00000000000006d8 RDI: ffffa07afe332180\nRBP: 00000000000006d8 R08: ffffac20c5857ad0 R09: 0000000000ffff10\nR10: 0000000000000001 R11: ffffa07af27e2de0 R12: 000000000000001c\nR13: ffffac20c5857ad0 R14: ffffa07a96fe9040 R15: 000000000000001c\nFS:  00007fe395eed7c0(0000) GS:ffffa07e2c980000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000008 CR3: 000000011febe001 CR4: 00000000003706f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n\n...\n\n ? gp100_vmm_pgt_mem+0xe3/0x180 [nouveau]\n ? gp100_vmm_pgt_mem+0x37/0x180 [nouveau]\n nvkm_vmm_iter+0x351/0xa20 [nouveau]\n ? __pfx_nvkm_vmm_ref_ptes+0x10/0x10 [nouveau]\n ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau]\n ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau]\n ? __lock_acquire+0x3ed/0x2170\n ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau]\n nvkm_vmm_ptes_get_map+0xc2/0x100 [nouveau]\n ? __pfx_nvkm_vmm_ref_ptes+0x10/0x10 [nouveau]\n ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau]\n nvkm_vmm_map_locked+0x224/0x3a0 [nouveau]\n\nAdding any sort of useful debug usually makes it go away, so I hand\nwrote the function in a line, and debugged the asm.\n\nEvery so often pt-\u003ememory-\u003eptrs is NULL. This ptrs ptr is set in\nthe nv50_instobj_acquire called from nvkm_kmap.\n\nIf Thread A and Thread B both get to nv50_instobj_acquire around\nthe same time, and Thread A hits the refcount_set line, and in\nlockstep thread B succeeds at refcount_inc_not_zero, there is a\nchance the ptrs value won\u0027t have been stored since refcount_set\nis unordered. Force a memory barrier here, I picked smp_mb, since\nwe want it on all CPUs and it\u0027s write followed by a read.\n\nv2: use paired smp_rmb/smp_wmb."
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      "providerMetadata": {
        "dateUpdated": "2025-05-04T09:01:29.153Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/bba8ec5e9b16649d85bc9e9086bf7ae5b5716ff9"
        },
        {
          "url": "https://git.kernel.org/stable/c/1bc4825d4c3ec6abe43cf06c3c39d664d044cbf7"
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          "url": "https://git.kernel.org/stable/c/a019b44b1bc6ed224c46fb5f88a8a10dd116e525"
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          "url": "https://git.kernel.org/stable/c/21ca9539f09360fd83654f78f2c361f2f5ddcb52"
        },
        {
          "url": "https://git.kernel.org/stable/c/fff1386cc889d8fb4089d285f883f8cba62d82ce"
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      "title": "nouveau: fix instmem race condition around ptr stores",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26984",
    "datePublished": "2024-05-01T05:27:20.506Z",
    "dateReserved": "2024-02-19T14:20:24.204Z",
    "dateUpdated": "2025-11-04T17:15:10.866Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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\"unaffected\", \"version\": \"0\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.313\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.275\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.88\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.29\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/bba8ec5e9b16649d85bc9e9086bf7ae5b5716ff9\"}, {\"url\": \"https://git.kernel.org/stable/c/1bc4825d4c3ec6abe43cf06c3c39d664d044cbf7\"}, {\"url\": \"https://git.kernel.org/stable/c/13d76b2f443dc371842916dd8768009ff1594716\"}, {\"url\": \"https://git.kernel.org/stable/c/3ab056814cd8ab84744c9a19ef51360b2271c572\"}, {\"url\": \"https://git.kernel.org/stable/c/ad74d208f213c06d860916ad40f609ade8c13039\"}, {\"url\": \"https://git.kernel.org/stable/c/a019b44b1bc6ed224c46fb5f88a8a10dd116e525\"}, {\"url\": \"https://git.kernel.org/stable/c/21ca9539f09360fd83654f78f2c361f2f5ddcb52\"}, {\"url\": \"https://git.kernel.org/stable/c/fff1386cc889d8fb4089d285f883f8cba62d82ce\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnouveau: fix instmem race condition around ptr stores\\n\\nRunning a lot of VK CTS in parallel against nouveau, once every\\nfew hours you might see something like this crash.\\n\\nBUG: kernel NULL pointer dereference, address: 0000000000000008\\nPGD 8000000114e6e067 P4D 8000000114e6e067 PUD 109046067 PMD 0\\nOops: 0000 [#1] PREEMPT SMP PTI\\nCPU: 7 PID: 53891 Comm: deqp-vk Not tainted 6.8.0-rc6+ #27\\nHardware name: Gigabyte Technology Co., Ltd. Z390 I AORUS PRO WIFI/Z390 I AORUS PRO WIFI-CF, BIOS F8 11/05/2021\\nRIP: 0010:gp100_vmm_pgt_mem+0xe3/0x180 [nouveau]\\nCode: c7 48 01 c8 49 89 45 58 85 d2 0f 84 95 00 00 00 41 0f b7 46 12 49 8b 7e 08 89 da 42 8d 2c f8 48 8b 47 08 41 83 c7 01 48 89 ee \u003c48\u003e 8b 40 08 ff d0 0f 1f 00 49 8b 7e 08 48 89 d9 48 8d 75 04 48 c1\\nRSP: 0000:ffffac20c5857838 EFLAGS: 00010202\\nRAX: 0000000000000000 RBX: 00000000004d8001 RCX: 0000000000000001\\nRDX: 00000000004d8001 RSI: 00000000000006d8 RDI: ffffa07afe332180\\nRBP: 00000000000006d8 R08: ffffac20c5857ad0 R09: 0000000000ffff10\\nR10: 0000000000000001 R11: ffffa07af27e2de0 R12: 000000000000001c\\nR13: ffffac20c5857ad0 R14: ffffa07a96fe9040 R15: 000000000000001c\\nFS:  00007fe395eed7c0(0000) GS:ffffa07e2c980000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000000000000008 CR3: 000000011febe001 CR4: 00000000003706f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n\\n...\\n\\n ? gp100_vmm_pgt_mem+0xe3/0x180 [nouveau]\\n ? gp100_vmm_pgt_mem+0x37/0x180 [nouveau]\\n nvkm_vmm_iter+0x351/0xa20 [nouveau]\\n ? __pfx_nvkm_vmm_ref_ptes+0x10/0x10 [nouveau]\\n ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau]\\n ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau]\\n ? __lock_acquire+0x3ed/0x2170\\n ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau]\\n nvkm_vmm_ptes_get_map+0xc2/0x100 [nouveau]\\n ? __pfx_nvkm_vmm_ref_ptes+0x10/0x10 [nouveau]\\n ? __pfx_gp100_vmm_pgt_mem+0x10/0x10 [nouveau]\\n nvkm_vmm_map_locked+0x224/0x3a0 [nouveau]\\n\\nAdding any sort of useful debug usually makes it go away, so I hand\\nwrote the function in a line, and debugged the asm.\\n\\nEvery so often pt-\u003ememory-\u003eptrs is NULL. This ptrs ptr is set in\\nthe nv50_instobj_acquire called from nvkm_kmap.\\n\\nIf Thread A and Thread B both get to nv50_instobj_acquire around\\nthe same time, and Thread A hits the refcount_set line, and in\\nlockstep thread B succeeds at refcount_inc_not_zero, there is a\\nchance the ptrs value won\u0027t have been stored since refcount_set\\nis unordered. Force a memory barrier here, I picked smp_mb, since\\nwe want it on all CPUs and it\u0027s write followed by a read.\\n\\nv2: use paired smp_rmb/smp_wmb.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.313\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.275\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.216\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.157\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.88\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.29\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.8\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"4.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:01:29.153Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26984\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T17:15:10.866Z\", \"dateReserved\": \"2024-02-19T14:20:24.204Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:27:20.506Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.