CVE-2026-98036

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98036", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:19:56.071Z", "datePublished": "2026-09-25T10:23:50.530Z", "dateUpdated": "2026-10-19T09:12:41.963Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:12:41.963Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve special fields in recycled rhtab elements\n\nrhtab_map_update_elem() initializes special fields after obtaining an\nelement from bpf_mem_cache_alloc(). The allocator can return a fresh,\nzeroed unit, or recycle one from its RCU-pending lists before the\nregistered destructor has run.\n\nA BPF program can retain a map-value pointer after deleting its element\nand initialize and arm a timer through that pointer. If the deleted unit\nis recycled, check_and_init_map_value() clears the only pointer to the\ntimer. Neither a later deletion nor rhtab_mem_dtor() can then cancel it,\nand the callback can run with its key and value pointing into freed memory.\n\nDo not reinitialize special fields on insertion. Fresh allocator units are\nalready zeroed. For recycled units, the special fields are ownership state\nthat must remain visible to the eventual destructor. copy_map_value()\nalready skips those fields, matching the non-preallocated hash-map path and\nthe lifecycle established by commit 275c30bcee66 (\"bpf: Don't reinit map\nvalue in prealloc_lru_pop\").\n\n[ kkd: Split out the fix and rewrote the commit log ]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/hashtab.c"], "versions": [{"version": "6905f8601298ecd2d1932a4b4849bf265201118e", "lessThan": "6a5266b8288216b86602ff687d528abfb066dfd8", "status": "affected", "versionType": "git"}, {"version": "6905f8601298ecd2d1932a4b4849bf265201118e", "lessThan": "5df46ddcb7b36878c1b691e9057a0509042a2567", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/hashtab.c"], "versions": [{"version": "7.2", "status": "affected"}, {"version": "0", "lessThan": "7.2", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "7.2", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.2", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6a5266b8288216b86602ff687d528abfb066dfd8"}, {"url": "https://git.kernel.org/stable/c/5df46ddcb7b36878c1b691e9057a0509042a2567"}], "title": "bpf: Preserve special fields in recycled rhtab elements", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/hashtab.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6a5266b8288216b86602ff687d528abfb066dfd8", "status": "affected", "version": "6905f8601298ecd2d1932a4b4849bf265201118e", "versionType": "git"}, {"lessThan": "5df46ddcb7b36878c1b691e9057a0509042a2567", "status": "affected", "version": "6905f8601298ecd2d1932a4b4849bf265201118e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/hashtab.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.2"}, {"lessThan": "7.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nbpf: Preserve special fields in recycled rhtab elements\n\nrhtab_map_update_elem() initializes special fields after obtaining an\nelement from bpf_mem_cache_alloc(). The allocator can return a fresh,\nzeroed unit, or recycle one from its RCU-pending lists before the\nregistered destructor has run.\n\nA BPF program can retain a map-value pointer after deleting its element\nand initialize and arm a timer through that pointer. If the deleted unit\nis recycled, check_and_init_map_value() clears the only pointer to the\ntimer. Neither a later deletion nor rhtab_mem_dtor() can then cancel it,\nand the callback can run with its key and value pointing into freed memory.\n\nDo not reinitialize special fields on insertion. Fresh allocator units are\nalready zeroed. For recycled units, the special fields are ownership state\nthat must remain visible to the eventual destructor. copy_map_value()\nalready skips those fields, matching the non-preallocated hash-map path and\nthe lifecycle established by commit 275c30bcee66 (\"bpf: Don't reinit map\nvalue in prealloc_lru_pop\").\n\n[ kkd: Split out the fix and rewrote the commit log ]"}], "id": "CVE-2026-98036", "lastModified": "2026-10-19T10:17:57.567", "metrics": {}, "published": "2026-09-25T11:17:32.340", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5df46ddcb7b36878c1b691e9057a0509042a2567"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6a5266b8288216b86602ff687d528abfb066dfd8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf: Preserve special fields in recycled rhtab elements", "id": "2541055", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541055"}, "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:\nbpf: Preserve special fields in recycled rhtab elements\nrhtab_map_update_elem() initializes special fields after obtaining an\nelement from bpf_mem_cache_alloc(). The allocator can return a fresh,\nzeroed unit, or recycle one from its RCU-pending lists before the\nregistered destructor has run.\nA BPF program can retain a map-value pointer after deleting its element\nand initialize and arm a timer through that pointer. If the deleted unit\nis recycled, check_and_init_map_value() clears the only pointer to the\ntimer. Neither a later deletion nor rhtab_mem_dtor() can then cancel it,\nand the callback can run with its key and value pointing into freed memory.\nDo not reinitialize special fields on insertion. Fresh allocator units are\nalready zeroed. For recycled units, the special fields are ownership state\nthat must remain visible to the eventual destructor. copy_map_value()\nalready skips those fields, matching the non-preallocated hash-map path and\nthe lifecycle established by commit 275c30bcee66 (\"bpf: Don't reinit map\nvalue in prealloc_lru_pop\").\n[ kkd: Split out the fix and rewrote the commit log ]", "A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. A local user with permission to run BPF programs can trigger a use-after-free condition, potentially leading to a system crash, denial of service (DoS), or privilege escalation. This flaw occurs during the recycling of resizable hash table elements, where the kernel overwrites references to active timers before they are cancelled. As a result, the timer callback executes with memory pointers referencing already-freed memory."], "name": "CVE-2026-98036", "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98036\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98036\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98036.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6905f8601298ecd2d1932a4b4849bf265201118e,6a5266b8288216b86602ff687d528abfb066dfd8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6905f8601298ecd2d1932a4b4849bf265201118e,5df46ddcb7b36878c1b691e9057a0509042a2567)"}}], "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": "semver", "value": "7.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc2,*]"}}], "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": "2026-09-25T15:15:14.510145+00:00", "updated": "2026-09-30T14:30:18.586333+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}