CVE-2026-72431

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72431", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.929Z", "datePublished": "2026-08-15T05:56:46.821Z", "dateUpdated": "2026-08-17T05:14:31.058Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:14:31.058Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nalloc_tag: fix use-after-free in /proc/allocinfo after module unload\n\nallocinfo_start() only reinitializes the codetag iterator at position 0. \nFor subsequent reads (position > 0), it reuses cached iterator state from\nthe previous batch. allocinfo_stop() drops mod_lock between read batches,\nwhich allows module unload to complete and free the module memory that the\ncached iterator still references:\n\n CPU0 (read) CPU1 (rmmod)\n ---- ----\n allocinfo_start(pos=0)\n down_read(mod_lock)\n allocinfo_show()\n ...\n allocinfo_stop()\n up_read(mod_lock)\n codetag_unload_module()\n kfree(cmod)\n release_module_tags()\n ...\n free_mod_mem()\n allocinfo_start(pos=N)\n down_read(mod_lock)\n // reuses cached iter, skips re-init\n allocinfo_show()\n ct->filename <-- UAF\n\nAfter free_mod_mem() frees the module's .rodata, allocinfo_show()\ndereferences ct->filename, ct->function which point there.\n\nSave the iterator state in allocinfo_next() and resume from it in\nallocinfo_start() with codetag_next_ct(), which detects module removal via\nidr_find() returning NULL and skips to the next module."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["lib/alloc_tag.c"], "versions": [{"version": "9f44df50fee4d2f6cb374177244ccfa9f0a5cc95", "lessThan": "37e3e8a2c3bfdd503209f043f8bbfbdcf5a1d92f", "status": "affected", "versionType": "git"}, {"version": "9f44df50fee4d2f6cb374177244ccfa9f0a5cc95", "lessThan": "008ceffd44040f809aead6d7bef7cb1210c4149a", "status": "affected", "versionType": "git"}, {"version": "9f44df50fee4d2f6cb374177244ccfa9f0a5cc95", "lessThan": "2956268efc457cb05d29c1bf94de1e8e684d7bbc", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["lib/alloc_tag.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/37e3e8a2c3bfdd503209f043f8bbfbdcf5a1d92f"}, {"url": "https://git.kernel.org/stable/c/008ceffd44040f809aead6d7bef7cb1210c4149a"}, {"url": "https://git.kernel.org/stable/c/2956268efc457cb05d29c1bf94de1e8e684d7bbc"}], "title": "alloc_tag: fix use-after-free in /proc/allocinfo after module unload", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["lib/alloc_tag.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "37e3e8a2c3bfdd503209f043f8bbfbdcf5a1d92f", "status": "affected", "version": "9f44df50fee4d2f6cb374177244ccfa9f0a5cc95", "versionType": "git"}, {"lessThan": "008ceffd44040f809aead6d7bef7cb1210c4149a", "status": "affected", "version": "9f44df50fee4d2f6cb374177244ccfa9f0a5cc95", "versionType": "git"}, {"lessThan": "2956268efc457cb05d29c1bf94de1e8e684d7bbc", "status": "affected", "version": "9f44df50fee4d2f6cb374177244ccfa9f0a5cc95", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["lib/alloc_tag.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"lessThan": "6.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nalloc_tag: fix use-after-free in /proc/allocinfo after module unload\n\nallocinfo_start() only reinitializes the codetag iterator at position 0. \nFor subsequent reads (position > 0), it reuses cached iterator state from\nthe previous batch. allocinfo_stop() drops mod_lock between read batches,\nwhich allows module unload to complete and free the module memory that the\ncached iterator still references:\n\n CPU0 (read) CPU1 (rmmod)\n ---- ----\n allocinfo_start(pos=0)\n down_read(mod_lock)\n allocinfo_show()\n ...\n allocinfo_stop()\n up_read(mod_lock)\n codetag_unload_module()\n kfree(cmod)\n release_module_tags()\n ...\n free_mod_mem()\n allocinfo_start(pos=N)\n down_read(mod_lock)\n // reuses cached iter, skips re-init\n allocinfo_show()\n ct->filename <-- UAF\n\nAfter free_mod_mem() frees the module's .rodata, allocinfo_show()\ndereferences ct->filename, ct->function which point there.\n\nSave the iterator state in allocinfo_next() and resume from it in\nallocinfo_start() with codetag_next_ct(), which detects module removal via\nidr_find() returning NULL and skips to the next module."}], "id": "CVE-2026-72431", "lastModified": "2026-08-17T06:19:10.443", "metrics": {}, "published": "2026-08-15T06:22:16.960", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/008ceffd44040f809aead6d7bef7cb1210c4149a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2956268efc457cb05d29c1bf94de1e8e684d7bbc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37e3e8a2c3bfdd503209f043f8bbfbdcf5a1d92f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: alloc_tag: fix use-after-free in /proc/allocinfo after module unload", "id": "2516600", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516600"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nalloc_tag: fix use-after-free in /proc/allocinfo after module unload\nallocinfo_start() only reinitializes the codetag iterator at position 0. \nFor subsequent reads (position > 0), it reuses cached iterator state from\nthe previous batch. allocinfo_stop() drops mod_lock between read batches,\nwhich allows module unload to complete and free the module memory that the\ncached iterator still references:\nCPU0 (read) CPU1 (rmmod)\n---- ----\nallocinfo_start(pos=0)\ndown_read(mod_lock)\nallocinfo_show()\n...\nallocinfo_stop()\nup_read(mod_lock)\ncodetag_unload_module()\nkfree(cmod)\nrelease_module_tags()\n...\nfree_mod_mem()\nallocinfo_start(pos=N)\ndown_read(mod_lock)\n// reuses cached iter, skips re-init\nallocinfo_show()\nct->filename <-- UAF\nAfter free_mod_mem() frees the module's .rodata, allocinfo_show()\ndereferences ct->filename, ct->function which point there.\nSave the iterator state in allocinfo_next() and resume from it in\nallocinfo_start() with codetag_next_ct(), which detects module removal via\nidr_find() returning NULL and skips to the next module.", "A flaw was found in the Linux kernel. A vulnerability exists in the `/proc/allocinfo` feature where the system may attempt to access memory after it has been freed, known as a use-after-free. This can happen when a kernel module is unloaded while the system is still processing information from `/proc/allocinfo` that references the module's memory. A local attacker could potentially exploit this flaw to cause a system crash, leading to a Denial of Service."], "name": "CVE-2026-72431", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72431\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72431\nhttps://lore.kernel.org/linux-cve-announce/2026081527-CVE-2026-72431-30a8@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9f44df50fee4d2f6cb374177244ccfa9f0a5cc95,37e3e8a2c3bfdd503209f043f8bbfbdcf5a1d92f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9f44df50fee4d2f6cb374177244ccfa9f0a5cc95,008ceffd44040f809aead6d7bef7cb1210c4149a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9f44df50fee4d2f6cb374177244ccfa9f0a5cc95,2956268efc457cb05d29c1bf94de1e8e684d7bbc)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T12:00:05.303000+00:00", "updated": "2026-08-22T07:00:07.535979+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}