{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64416", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.786Z", "datePublished": "2026-07-25T08:50:55.997Z", "dateUpdated": "2026-07-25T08:50:55.997Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-25T08:50:55.997Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: swap_cgroup: fix NULL deref in lookup_swap_cgroup_id on swapless host\n\nlookup_swap_cgroup_id() passes swap_cgroup_ctrl[type].map to\n__swap_cgroup_id_lookup() without checking that the type was ever\nregistered via swap_cgroup_swapon(). On a swapless host every ctrl->map\nis NULL, so __swap_cgroup_id_lookup() dereferences NULL + a scaled\nswp_offset().\n\nSince commit bea67dcc5eea (\"mm: attempt to batch free swap entries for\nzap_pte_range()\"), zap_pte_range() -> swap_pte_batch() calls\nlookup_swap_cgroup_id() on any non-present, non-none PTE that decodes as a\nreal swap entry, without first validating it against swap_info[]. A\nsingle PTE corrupted into a type-0 swap entry takes the host down at\nprocess exit.\n\nWe hit this in production on a swapless 6.12.58 host: ~1s of\n\"get_swap_device: Bad swap file entry 3f800204222bb\" (do_swap_page() being\ncorrectly defensive about the same entry) followed by\n\n BUG: unable to handle page fault for address: 000003f800204220\n RIP: 0010:lookup_swap_cgroup_id+0x2b/0x60\n Call Trace:\n swap_pte_batch+0xbf/0x230\n zap_pte_range+0x4c8/0x780\n unmap_page_range+0x190/0x3e0\n exit_mmap+0xd9/0x3c0\n do_exit+0x20c/0x4b0\n\nsyzbot has reported the identical stack.\n\nThe source of the PTE corruption is a separate bug; this change makes the\nteardown path as robust as the fault path already is. Every other caller\nof lookup_swap_cgroup_id() is downstream of a get_swap_device() that has\nalready validated the entry, so the new branch is cold."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/swap_cgroup.c"], "versions": [{"version": "bea67dcc5eea0f6a213897a59b9e644977cd07e6", "lessThan": "818416fef38759f23210de449663cd9d7e293d39", "status": "affected", "versionType": "git"}, {"version": "bea67dcc5eea0f6a213897a59b9e644977cd07e6", "lessThan": "b415c00bf23df577a4a95673d00ae76687bcc1d4", "status": "affected", "versionType": "git"}, {"version": "bea67dcc5eea0f6a213897a59b9e644977cd07e6", "lessThan": "6a4196d19f477524d2f92adca90fc1fbe9a0420a", "status": "affected", "versionType": "git"}, {"version": "bea67dcc5eea0f6a213897a59b9e644977cd07e6", "lessThan": "63b02a9409cb5180398491b093e48bcb5315f5fb", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/swap_cgroup.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "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": "6.12", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/818416fef38759f23210de449663cd9d7e293d39"}, {"url": "https://git.kernel.org/stable/c/b415c00bf23df577a4a95673d00ae76687bcc1d4"}, {"url": "https://git.kernel.org/stable/c/6a4196d19f477524d2f92adca90fc1fbe9a0420a"}, {"url": "https://git.kernel.org/stable/c/63b02a9409cb5180398491b093e48bcb5315f5fb"}], "title": "mm: swap_cgroup: fix NULL deref in lookup_swap_cgroup_id on swapless host", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: mm: swap_cgroup: fix NULL deref in lookup_swap_cgroup_id on swapless host", "id": "2507064", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507064"}, "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-476", "details": ["A flaw was found in the Linux kernel's memory management subsystem, specifically within the swap cgroup functionality. When a system is configured without swap, a corrupted page table entry (PTE) can lead to a null pointer dereference during process exit. This vulnerability allows a local attacker to cause a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-64416", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64416\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64416\nhttps://lore.kernel.org/linux-cve-announce/2026072533-CVE-2026-64416-21e6@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bea67dcc5eea0f6a213897a59b9e644977cd07e6,818416fef38759f23210de449663cd9d7e293d39)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bea67dcc5eea0f6a213897a59b9e644977cd07e6,b415c00bf23df577a4a95673d00ae76687bcc1d4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bea67dcc5eea0f6a213897a59b9e644977cd07e6,6a4196d19f477524d2f92adca90fc1fbe9a0420a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bea67dcc5eea0f6a213897a59b9e644977cd07e6,63b02a9409cb5180398491b093e48bcb5315f5fb)"}}], "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": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"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": "2026-07-26T01:30:05.151301+00:00", "updated": "2026-08-01T01:45:03.537064+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}