{"id":"CVE-2026-53270","state":"PUBLISHED","title":"ipvs: clear the svc scheduler ptr early on edit","description":"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.","publishedAt":"2026-06-25T08:39:55.830Z","updatedAt":"2026-10-19T19:57:32.999Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"d10730a1f2caf08088e0db1b19b242f3e6fa5f06","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"e4feec3174036ba772006be74beee0efa09a9eb8","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"7d4f5004511757e3984901ffb412fcf858d80ed5","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"c6376b9b1b4d2bad638256b1b3588e073344ae69","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"14e4689c113b4c06af1069364ade24fdd7055f33","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"25918720ba97f974a4f8d433b5a0132c5b43f6f3","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"193989cc6d80dd8e0460fb3992e69fa03bf0ff9b","versionType":"git"},{"version":"c803fddd2a95a70873c68dbff42d4c59fd2e674e","status":"affected","versionType":"git"},{"version":"4ec8fb23158797affae7993c15beba080488482f","status":"affected","versionType":"git"},{"version":"3.18.23","status":"affected","lessThan":"3.19","versionType":"semver"},{"version":"4.1.11","status":"affected","lessThan":"4.2","versionType":"semver"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"references":["https://git.kernel.org/stable/c/d10730a1f2caf08088e0db1b19b242f3e6fa5f06","https://git.kernel.org/stable/c/e4feec3174036ba772006be74beee0efa09a9eb8","https://git.kernel.org/stable/c/7d4f5004511757e3984901ffb412fcf858d80ed5","https://git.kernel.org/stable/c/c6376b9b1b4d2bad638256b1b3588e073344ae69","https://git.kernel.org/stable/c/14e4689c113b4c06af1069364ade24fdd7055f33","https://git.kernel.org/stable/c/25918720ba97f974a4f8d433b5a0132c5b43f6f3","https://git.kernel.org/stable/c/19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03","https://git.kernel.org/stable/c/193989cc6d80dd8e0460fb3992e69fa03bf0ff9b"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53270.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53270","state":"PUBLISHED","datePublished":"2026-06-25T08:39:55.830Z","dateUpdated":"2026-10-19T19:57:32.999Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.395Z"},"containers":{"cna":{"title":"ipvs: clear the svc scheduler ptr early on edit","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"d10730a1f2caf08088e0db1b19b242f3e6fa5f06","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"e4feec3174036ba772006be74beee0efa09a9eb8","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"7d4f5004511757e3984901ffb412fcf858d80ed5","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"c6376b9b1b4d2bad638256b1b3588e073344ae69","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"14e4689c113b4c06af1069364ade24fdd7055f33","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"25918720ba97f974a4f8d433b5a0132c5b43f6f3","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03","versionType":"git"},{"version":"05f00505a89acd21f5d0d20f5797dfbc4cf85243","status":"affected","lessThan":"193989cc6d80dd8e0460fb3992e69fa03bf0ff9b","versionType":"git"},{"version":"c803fddd2a95a70873c68dbff42d4c59fd2e674e","status":"affected","versionType":"git"},{"version":"4ec8fb23158797affae7993c15beba080488482f","status":"affected","versionType":"git"},{"version":"3.18.23","status":"affected","lessThan":"3.19","versionType":"semver"},{"version":"4.1.11","status":"affected","lessThan":"4.2","versionType":"semver"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:34:46.621Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-53270","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:28:13.169684Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:57:32.999Z"}}]}}}