{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53270", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.395Z", "datePublished": "2026-06-25T08:39:55.830Z", "dateUpdated": "2026-08-05T12:34:46.621Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:46.621Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: clear the svc scheduler ptr early on edit\n\nip_vs_edit_service() while unbinding the old scheduler clears\nthe svc->scheduler ptr after the scheduler module initiates\nRCU callbacks. This can cause packets to use the old\nscheduler at the time when svc->sched_data is already freed\nafter RCU grace period.\n\nFix it by clearing the ptr early in ip_vs_unbind_scheduler(),\nbefore the done_service method schedules any RCU callbacks.\n\nAlso, if the new scheduler fails to initialize when replacing\nthe old scheduler, try to restore the old scheduler while still\nreturning the error code." } ], "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 - The vulnerable transition is reached through local IPVS service-edit control paths such as `setsockopt(IP_VS_SO_SET_EDIT)` or IPVS generic netlink; packets exercise the stale scheduler afterward, but the attacker must initiate the local service edit.\nAC:L - The attacker can control both sides of the condition by changing the scheduler and generating new TCP/UDP/SCTP traffic to the service, so this is not dependent on an uncontrollable race.\nPR:L - The legacy setsockopt path checks `CAP_NET_ADMIN` in the socket network namespace, which is reachable by an unprivileged local user via user and network namespaces in plausible deployments.\nUI:N - No victim interaction is needed once the attacker has local access and namespace privileges; the attacker can create/edit the IPVS service and send triggering traffic.\nS:U - The impact is kernel memory corruption within the same host security authority, not a VM, IOMMU, or separate security-scope escape.\nC:H - This is an RCU use-after-free of scheduler-private `svc->sched_data`, and freed scheduler state can be reused and dereferenced by packet scheduling, making high confidentiality impact defensible.\nI:H - Several affected schedulers write through the stale `sched_data` pointer, so the UAF can plausibly become arbitrary kernel memory corruption or control-flow compromise.\nA:H - At minimum the stale scheduler pointer can dereference freed scheduler state during packet processing and crash or panic the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/ip_vs.h", "net/netfilter/ipvs/ip_vs_ctl.c", "net/netfilter/ipvs/ip_vs_sched.c" ], "versions": [ { "version": "05f00505a89acd21f5d0d20f5797dfbc4cf85243", "lessThan": "d10730a1f2caf08088e0db1b19b242f3e6fa5f06", "status": "affected", "versionType": "git" }, { "version": "05f00505a89acd21f5d0d20f5797dfbc4cf85243", "lessThan": "e4feec3174036ba772006be74beee0efa09a9eb8", "status": "affected", "versionType": "git" }, { "version": "05f00505a89acd21f5d0d20f5797dfbc4cf85243", "lessThan": "7d4f5004511757e3984901ffb412fcf858d80ed5", "status": "affected", "versionType": "git" }, { "version": "05f00505a89acd21f5d0d20f5797dfbc4cf85243", "lessThan": "c6376b9b1b4d2bad638256b1b3588e073344ae69", "status": "affected", "versionType": "git" }, { "version": "05f00505a89acd21f5d0d20f5797dfbc4cf85243", "lessThan": "14e4689c113b4c06af1069364ade24fdd7055f33", "status": "affected", "versionType": "git" }, { "version": "05f00505a89acd21f5d0d20f5797dfbc4cf85243", "lessThan": "25918720ba97f974a4f8d433b5a0132c5b43f6f3", "status": "affected", "versionType": "git" }, { "version": "05f00505a89acd21f5d0d20f5797dfbc4cf85243", "lessThan": "19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03", "status": "affected", "versionType": "git" }, { "version": "05f00505a89acd21f5d0d20f5797dfbc4cf85243", "lessThan": "193989cc6d80dd8e0460fb3992e69fa03bf0ff9b", "status": "affected", "versionType": "git" }, { "version": "c803fddd2a95a70873c68dbff42d4c59fd2e674e", "status": "affected", "versionType": "git" }, { "version": "4ec8fb23158797affae7993c15beba080488482f", "status": "affected", "versionType": "git" }, { "version": "3.18.23", "lessThan": "3.19", "status": "affected", "versionType": "semver" }, { "version": "4.1.11", "lessThan": "4.2", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/ip_vs.h", "net/netfilter/ipvs/ip_vs_ctl.c", "net/netfilter/ipvs/ip_vs_sched.c" ], "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "4.2", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d10730a1f2caf08088e0db1b19b242f3e6fa5f06" }, { "url": "https://git.kernel.org/stable/c/e4feec3174036ba772006be74beee0efa09a9eb8" }, { "url": "https://git.kernel.org/stable/c/7d4f5004511757e3984901ffb412fcf858d80ed5" }, { "url": "https://git.kernel.org/stable/c/c6376b9b1b4d2bad638256b1b3588e073344ae69" }, { "url": "https://git.kernel.org/stable/c/14e4689c113b4c06af1069364ade24fdd7055f33" }, { "url": "https://git.kernel.org/stable/c/25918720ba97f974a4f8d433b5a0132c5b43f6f3" }, { "url": "https://git.kernel.org/stable/c/19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03" }, { "url": "https://git.kernel.org/stable/c/193989cc6d80dd8e0460fb3992e69fa03bf0ff9b" } ], "title": "ipvs: clear the svc scheduler ptr early on edit", "x_generator": { "engine": "bippy-1.2.0" } } } }