CVE-2023-53419 (GCVE-0-2023-53419)
Vulnerability from cvelistv5
Published
2025-09-18 16:04
Modified
2025-09-18 16:04
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access
For kernels built with CONFIG_PREEMPT_RCU=y, the following scenario can
result in a NULL-pointer dereference:
CPU1 CPU2
rcu_preempt_deferred_qs_irqrestore rcu_print_task_exp_stall
if (special.b.blocked) READ_ONCE(rnp->exp_tasks) != NULL
raw_spin_lock_rcu_node
np = rcu_next_node_entry(t, rnp)
if (&t->rcu_node_entry == rnp->exp_tasks)
WRITE_ONCE(rnp->exp_tasks, np)
....
raw_spin_unlock_irqrestore_rcu_node
raw_spin_lock_irqsave_rcu_node
t = list_entry(rnp->exp_tasks->prev,
struct task_struct, rcu_node_entry)
(if rnp->exp_tasks is NULL, this
will dereference a NULL pointer)
The problem is that CPU2 accesses the rcu_node structure's->exp_tasks
field without holding the rcu_node structure's ->lock and CPU2 did
not observe CPU1's change to rcu_node structure's ->exp_tasks in time.
Therefore, if CPU1 sets rcu_node structure's->exp_tasks pointer to NULL,
then CPU2 might dereference that NULL pointer.
This commit therefore holds the rcu_node structure's ->lock while
accessing that structure's->exp_tasks field.
[ paulmck: Apply Frederic Weisbecker feedback. ]
References
Impacted products
{ "containers": { "cna": { "affected": [ { "defaultStatus": "unaffected", "product": "Linux", "programFiles": [ "kernel/rcu/tree_exp.h" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThan": "a7d21b8585894e6fff973f6ddae42f02b13f600f", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git" }, { "lessThan": "e30a55e98ae6c44253d8b129efefd5da5bc6e3bc", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git" }, { "lessThan": "d0a8c0e31a09ec1efd53079083e2a677956b4d91", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git" }, { "lessThan": "2bc0ae94ef1f9ed322d8ee439de3239ea3632ab2", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git" }, { "lessThan": "3c1566bca3f8349f12b75d0a2d5e4a20ad6262ec", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git" } ] }, { "defaultStatus": "affected", "product": "Linux", "programFiles": [ "kernel/rcu/tree_exp.h" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.181", "versionType": "semver" }, { "lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.113", "versionType": "semver" }, { "lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.30", "versionType": "semver" }, { "lessThanOrEqual": "6.3.*", "status": "unaffected", "version": "6.3.4", "versionType": "semver" }, { "lessThanOrEqual": "*", "status": "unaffected", "version": "6.4", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.10.181", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.15.113", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.1.30", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.3.4", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.4", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu: Protect rcu_print_task_exp_stall() -\u003eexp_tasks access\n\nFor kernels built with CONFIG_PREEMPT_RCU=y, the following scenario can\nresult in a NULL-pointer dereference:\n\n CPU1 CPU2\nrcu_preempt_deferred_qs_irqrestore rcu_print_task_exp_stall\n if (special.b.blocked) READ_ONCE(rnp-\u003eexp_tasks) != NULL\n raw_spin_lock_rcu_node\n np = rcu_next_node_entry(t, rnp)\n if (\u0026t-\u003ercu_node_entry == rnp-\u003eexp_tasks)\n WRITE_ONCE(rnp-\u003eexp_tasks, np)\n ....\n raw_spin_unlock_irqrestore_rcu_node\n raw_spin_lock_irqsave_rcu_node\n t = list_entry(rnp-\u003eexp_tasks-\u003eprev,\n struct task_struct, rcu_node_entry)\n (if rnp-\u003eexp_tasks is NULL, this\n will dereference a NULL pointer)\n\nThe problem is that CPU2 accesses the rcu_node structure\u0027s-\u003eexp_tasks\nfield without holding the rcu_node structure\u0027s -\u003elock and CPU2 did\nnot observe CPU1\u0027s change to rcu_node structure\u0027s -\u003eexp_tasks in time.\nTherefore, if CPU1 sets rcu_node structure\u0027s-\u003eexp_tasks pointer to NULL,\nthen CPU2 might dereference that NULL pointer.\n\nThis commit therefore holds the rcu_node structure\u0027s -\u003elock while\naccessing that structure\u0027s-\u003eexp_tasks field.\n\n[ paulmck: Apply Frederic Weisbecker feedback. ]" } ], "providerMetadata": { "dateUpdated": "2025-09-18T16:04:02.955Z", "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux" }, "references": [ { "url": "https://git.kernel.org/stable/c/a7d21b8585894e6fff973f6ddae42f02b13f600f" }, { "url": "https://git.kernel.org/stable/c/e30a55e98ae6c44253d8b129efefd5da5bc6e3bc" }, { "url": "https://git.kernel.org/stable/c/d0a8c0e31a09ec1efd53079083e2a677956b4d91" }, { "url": "https://git.kernel.org/stable/c/2bc0ae94ef1f9ed322d8ee439de3239ea3632ab2" }, { "url": "https://git.kernel.org/stable/c/3c1566bca3f8349f12b75d0a2d5e4a20ad6262ec" } ], "title": "rcu: Protect rcu_print_task_exp_stall() -\u003eexp_tasks access", "x_generator": { "engine": "bippy-1.2.0" } } }, "cveMetadata": { "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "assignerShortName": "Linux", "cveId": "CVE-2023-53419", "datePublished": "2025-09-18T16:04:02.955Z", "dateReserved": "2025-09-17T14:54:09.741Z", "dateUpdated": "2025-09-18T16:04:02.955Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1", "vulnerability-lookup:meta": { "nvd": "{\"cve\":{\"id\":\"CVE-2023-53419\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-18T16:15:45.650\",\"lastModified\":\"2025-09-19T16:00:27.847\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrcu: Protect rcu_print_task_exp_stall() -\u003eexp_tasks access\\n\\nFor kernels built with CONFIG_PREEMPT_RCU=y, the following scenario can\\nresult in a NULL-pointer dereference:\\n\\n CPU1 CPU2\\nrcu_preempt_deferred_qs_irqrestore rcu_print_task_exp_stall\\n if (special.b.blocked) READ_ONCE(rnp-\u003eexp_tasks) != NULL\\n raw_spin_lock_rcu_node\\n np = rcu_next_node_entry(t, rnp)\\n if (\u0026t-\u003ercu_node_entry == rnp-\u003eexp_tasks)\\n WRITE_ONCE(rnp-\u003eexp_tasks, np)\\n ....\\n raw_spin_unlock_irqrestore_rcu_node\\n raw_spin_lock_irqsave_rcu_node\\n t = list_entry(rnp-\u003eexp_tasks-\u003eprev,\\n struct task_struct, rcu_node_entry)\\n (if rnp-\u003eexp_tasks is NULL, this\\n will dereference a NULL pointer)\\n\\nThe problem is that CPU2 accesses the rcu_node structure\u0027s-\u003eexp_tasks\\nfield without holding the rcu_node structure\u0027s -\u003elock and CPU2 did\\nnot observe CPU1\u0027s change to rcu_node structure\u0027s -\u003eexp_tasks in time.\\nTherefore, if CPU1 sets rcu_node structure\u0027s-\u003eexp_tasks pointer to NULL,\\nthen CPU2 might dereference that NULL pointer.\\n\\nThis commit therefore holds the rcu_node structure\u0027s -\u003elock while\\naccessing that structure\u0027s-\u003eexp_tasks field.\\n\\n[ paulmck: Apply Frederic Weisbecker feedback. ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2bc0ae94ef1f9ed322d8ee439de3239ea3632ab2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c1566bca3f8349f12b75d0a2d5e4a20ad6262ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7d21b8585894e6fff973f6ddae42f02b13f600f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0a8c0e31a09ec1efd53079083e2a677956b4d91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e30a55e98ae6c44253d8b129efefd5da5bc6e3bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}" } }
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Sightings
Author | Source | Type | Date |
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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.
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