CVE-2026-98364

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98364", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.344Z", "datePublished": "2026-10-06T08:46:50.051Z", "dateUpdated": "2026-10-19T09:18:16.366Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:18:16.366Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: hold net_device reference under RCU in bundle creation\n\nxfrm_bundle_create() and xfrm_create_dummy_bundle() read dst->dev into\na local pointer without taking a device reference, then pass it to\nxfrm_fill_dst(). A concurrent RTM_DELLINK replaces dst->dev via\ndst_dev_put() and frees the old net_device, causing a use-after-free\nwhen xfrm6_fill_dst() later dereferences the stale dev pointer.\n\n BUG: KASAN: slab-use-after-free in xfrm6_fill_dst+0x82c/0x860\n (net/ipv6/xfrm6_policy.c:86 netdev_hold())\n Read of size 8 at addr ffff8880142fe588 by task exploit/153\n Call Trace:\n xfrm6_fill_dst+0x82c/0x860\n xfrm_resolve_and_create_bundle+0x21d4/0x2bd0\n xfrm_lookup_with_ifid+0x485/0x1640\n ip6_dst_lookup_flow+0x19b/0x1e0\n udpv6_sendmsg+0x1443/0x2dd0\n\nFix this by reading dst->dev via dst_dev_rcu() and keeping the RCU\nread-side critical section active until xfrm_fill_dst() has taken the\nrequired device references."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Both sides of the race are local syscalls: sendmsg() (udpv6_sendmsg->ip6_dst_lookup_flow->xfrm_lookup_with_ifid->xfrm_bundle_create) and an RTM_DELLINK rtnetlink request that frees the net_device. A remote peer cannot delete the link, so the network cannot cause the freed state.\nAC:L - The attacker controls both sides of the race: they repeatedly send through an xfrm-policy-matched route while deleting the link in a loop. The window between reading dst->dev and netdev_hold() in xfrm_fill_dst() is short, but the attacker can retry as often as needed.\nPR:L - xfrm_user_rcv_msg only checks netlink_net_capable(CAP_NET_ADMIN), and RTM_DELLINK is also checked per namespace. An unprivileged user with unshare -Urn can create a device, install the XFRM policy and state, and delete the device inside their own network namespace.\nUI:N - No victim action is needed: the attacker sets up the namespace, the xfrm configuration, the sending socket and the link deletion entirely on their own.\nS:U - The use-after-free is inside the kernel's own networking code and the impact stays within the kernel's security authority; no VM or IOMMU boundary is crossed.\nC:H - xfrm6_fill_dst() reads dev->ip6_ptr from the freed net_device through in6_dev_get() and stores the stale dev in a new dst. A reclaimed object controls those values, which can be used to disclose kernel memory.\nI:H - netdev_hold() increments a refcount inside the freed net_device, and in6_dev_get() increments a refcount on a pointer taken from the reclaimed object. Both are writes into attacker-reclaimable slab memory, usable to corrupt kernel data and hijack control flow.\nA:H - KASAN reports a slab-use-after-free in xfrm6_fill_dst(). On production kernels the stale dev stays attached to the new xfrm dst and is dereferenced later, which leads to an oops or panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_policy.c"], "versions": [{"version": "25ee3286dcbc830a833354bb1d15567956844813", "lessThan": "8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807", "status": "affected", "versionType": "git"}, {"version": "25ee3286dcbc830a833354bb1d15567956844813", "lessThan": "9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_policy.c"], "versions": [{"version": "2.6.25", "status": "affected"}, {"version": "0", "lessThan": "2.6.25", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.8", "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": "2.6.25", "versionEndExcluding": "7.2.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807"}, {"url": "https://git.kernel.org/stable/c/9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1"}], "title": "xfrm: hold net_device reference under RCU in bundle creation", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/xfrm/xfrm_policy.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807", "status": "affected", "version": "25ee3286dcbc830a833354bb1d15567956844813", "versionType": "git"}, {"lessThan": "9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1", "status": "affected", "version": "25ee3286dcbc830a833354bb1d15567956844813", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/xfrm/xfrm_policy.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.25"}, {"lessThan": "2.6.25", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "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\nxfrm: hold net_device reference under RCU in bundle creation\n\nxfrm_bundle_create() and xfrm_create_dummy_bundle() read dst->dev into\na local pointer without taking a device reference, then pass it to\nxfrm_fill_dst(). A concurrent RTM_DELLINK replaces dst->dev via\ndst_dev_put() and frees the old net_device, causing a use-after-free\nwhen xfrm6_fill_dst() later dereferences the stale dev pointer.\n\n BUG: KASAN: slab-use-after-free in xfrm6_fill_dst+0x82c/0x860\n (net/ipv6/xfrm6_policy.c:86 netdev_hold())\n Read of size 8 at addr ffff8880142fe588 by task exploit/153\n Call Trace:\n xfrm6_fill_dst+0x82c/0x860\n xfrm_resolve_and_create_bundle+0x21d4/0x2bd0\n xfrm_lookup_with_ifid+0x485/0x1640\n ip6_dst_lookup_flow+0x19b/0x1e0\n udpv6_sendmsg+0x1443/0x2dd0\n\nFix this by reading dst->dev via dst_dev_rcu() and keeping the RCU\nread-side critical section active until xfrm_fill_dst() has taken the\nrequired device references."}], "id": "CVE-2026-98364", "lastModified": "2026-10-19T10:18:39.290", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-10-06T09:18:30.547", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: xfrm: hold net_device reference under RCU in bundle creation", "id": "2546487", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546487"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxfrm: hold net_device reference under RCU in bundle creation\nxfrm_bundle_create() and xfrm_create_dummy_bundle() read dst->dev into\na local pointer without taking a device reference, then pass it to\nxfrm_fill_dst(). A concurrent RTM_DELLINK replaces dst->dev via\ndst_dev_put() and frees the old net_device, causing a use-after-free\nwhen xfrm6_fill_dst() later dereferences the stale dev pointer.\nBUG: KASAN: slab-use-after-free in xfrm6_fill_dst+0x82c/0x860\n(net/ipv6/xfrm6_policy.c:86 netdev_hold())\nRead of size 8 at addr ffff8880142fe588 by task exploit/153\nCall Trace:\nxfrm6_fill_dst+0x82c/0x860\nxfrm_resolve_and_create_bundle+0x21d4/0x2bd0\nxfrm_lookup_with_ifid+0x485/0x1640\nip6_dst_lookup_flow+0x19b/0x1e0\nudpv6_sendmsg+0x1443/0x2dd0\nFix this by reading dst->dev via dst_dev_rcu() and keeping the RCU\nread-side critical section active until xfrm_fill_dst() has taken the\nrequired device references.", "A flaw was found in the Linux kernel's IPsec (XFRM) networking subsystem. A race condition occurs when creating policy bundles while a network device is concurrently removed, leading to a use-after-free condition where the kernel accesses already-freed device memory. A local attacker can exploit this flaw to potentially escalate privileges or cause a Denial of Service (DoS) by crashing the system."], "name": "CVE-2026-98364", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98364\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98364\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98364.mbox"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[25ee3286dcbc830a833354bb1d15567956844813,8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[25ee3286dcbc830a833354bb1d15567956844813,9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1)"}}], "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": "2.6.25"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.25)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.8,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc4,*]"}}], "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": "2026-10-06T13:30:08.245778+00:00", "updated": "2026-10-09T06:15:18.842937+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}