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CVE-2024-49926 (GCVE-0-2024-49926)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2026-05-11 20:41
VLAI
Title
rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()
Summary
In the Linux kernel, the following vulnerability has been resolved: rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb() For kernels built with CONFIG_FORCE_NR_CPUS=y, the nr_cpu_ids is defined as NR_CPUS instead of the number of possible cpus, this will cause the following system panic: smpboot: Allowing 4 CPUs, 0 hotplug CPUs ... setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:512 nr_node_ids:1 ... BUG: unable to handle page fault for address: ffffffff9911c8c8 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: G W 6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6 RIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0 RSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082 CR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0 Call Trace: <TASK> ? __die+0x23/0x80 ? page_fault_oops+0xa4/0x180 ? exc_page_fault+0x152/0x180 ? asm_exc_page_fault+0x26/0x40 ? rcu_tasks_need_gpcb+0x25d/0x2c0 ? __pfx_rcu_tasks_kthread+0x40/0x40 rcu_tasks_one_gp+0x69/0x180 rcu_tasks_kthread+0x94/0xc0 kthread+0xe8/0x140 ? __pfx_kthread+0x40/0x40 ret_from_fork+0x34/0x80 ? __pfx_kthread+0x40/0x40 ret_from_fork_asm+0x1b/0x80 </TASK> Considering that there may be holes in the CPU numbers, use the maximum possible cpu number, instead of nr_cpu_ids, for configuring enqueue and dequeue limits. [ neeraj.upadhyay: Fix htmldocs build error reported by Stephen Rothwell ]
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:39 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8610b65680390a103b58f46282a1b05f7eebbba4 , < b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf (git)
Affected: 8610b65680390a103b58f46282a1b05f7eebbba4 , < 3104bddc666ff64b90491868bbc4c7ebdd90aedf (git)
Affected: 8610b65680390a103b58f46282a1b05f7eebbba4 , < 05095271a4fb0f6497121a057f9a2edf386d5d96 (git)
Affected: 8610b65680390a103b58f46282a1b05f7eebbba4 , < fd70e9f1d85f5323096ad313ba73f5fe3d15ea41 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.6.60 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: ffffffff9911c8c8 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: GW 6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6 RIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0 RSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082 CR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0 Rastreo de llamadas:  ? __die+0x23/0x80 ? page_fault_oops+0xa4/0x180 ? exc_page_fault+0x152/0x180 ? asm_exc_page_fault+0x26/0x40 ? rcu_tasks_need_gpcb+0x25d/0x2c0 ? __pfx_rcu_tasks_kthread+0x40/0x40 rcu_tasks_one_gp+0x69/0x180 rcu_tasks_kthread+0x94/0xc0 kthread+0xe8/0x140 ? __pfx_kthread+0x40/0x40 ret_from_fork+0x34/0x80 ? __pfx_kthread+0x40/0x40 ret_from_fork_asm+0x1b/0x80  Teniendo en cuenta que puede haber agujeros en los n\u00fameros de CPU, utilice el n\u00famero m\u00e1ximo posible de CPU, en lugar de nr_cpu_ids, para configurar los l\u00edmites de encolado y desencolado. 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    "redhat_vex": {
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      "cve": "CVE-2024-49926",
      "id": "CVE-2024-49926",
      "initial_release_date": "2024-10-21T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-49926.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49926\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:39:42.362013Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:39:45.749Z\"}}], \"cna\": {\"title\": \"rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\", \"lessThan\": \"b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\", \"lessThan\": \"3104bddc666ff64b90491868bbc4c7ebdd90aedf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\", \"lessThan\": \"05095271a4fb0f6497121a057f9a2edf386d5d96\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8610b65680390a103b58f46282a1b05f7eebbba4\", \"lessThan\": \"fd70e9f1d85f5323096ad313ba73f5fe3d15ea41\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/rcu/tasks.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.60\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/rcu/tasks.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf\"}, {\"url\": \"https://git.kernel.org/stable/c/3104bddc666ff64b90491868bbc4c7ebdd90aedf\"}, {\"url\": \"https://git.kernel.org/stable/c/05095271a4fb0f6497121a057f9a2edf386d5d96\"}, {\"url\": \"https://git.kernel.org/stable/c/fd70e9f1d85f5323096ad313ba73f5fe3d15ea41\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()\\n\\nFor kernels built with CONFIG_FORCE_NR_CPUS=y, the nr_cpu_ids is\\ndefined as NR_CPUS instead of the number of possible cpus, this\\nwill cause the following system panic:\\n\\nsmpboot: Allowing 4 CPUs, 0 hotplug CPUs\\n...\\nsetup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:512 nr_node_ids:1\\n...\\nBUG: unable to handle page fault for address: ffffffff9911c8c8\\nOops: 0000 [#1] PREEMPT SMP PTI\\nCPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: G W\\n6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6\\nRIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0\\nRSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082\\nCR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0\\nCall Trace:\\n\u003cTASK\u003e\\n? __die+0x23/0x80\\n? page_fault_oops+0xa4/0x180\\n? exc_page_fault+0x152/0x180\\n? asm_exc_page_fault+0x26/0x40\\n? rcu_tasks_need_gpcb+0x25d/0x2c0\\n? __pfx_rcu_tasks_kthread+0x40/0x40\\nrcu_tasks_one_gp+0x69/0x180\\nrcu_tasks_kthread+0x94/0xc0\\nkthread+0xe8/0x140\\n? __pfx_kthread+0x40/0x40\\nret_from_fork+0x34/0x80\\n? __pfx_kthread+0x40/0x40\\nret_from_fork_asm+0x1b/0x80\\n\u003c/TASK\u003e\\n\\nConsidering that there may be holes in the CPU numbers, use the\\nmaximum possible cpu number, instead of nr_cpu_ids, for configuring\\nenqueue and dequeue limits.\\n\\n[ neeraj.upadhyay: Fix htmldocs build error reported by Stephen Rothwell ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.60\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"5.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:54:22.931Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49926\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:54:22.931Z\", \"dateReserved\": \"2024-10-21T12:17:06.038Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:50.405Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.