{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53189", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-15T13:59:19.066Z", "datePublished": "2025-09-15T14:05:26.685Z", "dateUpdated": "2026-08-05T09:13:02.180Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:13:02.180Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6/addrconf: fix a potential refcount underflow for idev\n\nNow in addrconf_mod_rs_timer(), reference idev depends on whether\nrs_timer is not pending. Then modify rs_timer timeout.\n\nThere is a time gap in [1], during which if the pending rs_timer\nbecomes not pending. It will miss to hold idev, but the rs_timer\nis activated. Thus rs_timer callback function addrconf_rs_timer()\nwill be executed and put idev later without holding idev. A refcount\nunderflow issue for idev can be caused by this.\n\n\tif (!timer_pending(&idev->rs_timer))\n\t\tin6_dev_hold(idev);\n\t\t <--------------[1]\n\tmod_timer(&idev->rs_timer, jiffies + when);\n\nTo fix the issue, hold idev if mod_timer() return 0." } ], "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 bug is only reachable via local IPv6 addrconf paths that call addrconf_mod_rs_timer()—DAD completion on interface bring-up and inet6_set_iftoken() via rtnetlink—not via processing remote packets.\nAC:L - An attacker who can configure the netns controls both sides of the race: they can arm the RS timer, set a very short router_solicitation_interval via netns sysctl, and spam set_iftoken/ifup to hit the timer_pending-to-mod_timer window as the timer fires.\nPR:L - Triggering requires CAP_NET_ADMIN for interface/token/sysctl configuration, which an unprivileged user can obtain inside a user+network namespace; it does not require host-init-namespace root.\nUI:N - No victim interaction is needed; the attacker performs all interface and netlink operations themselves.\nS:U - Impact is memory corruption within the same kernel networking authority (inet6_dev UAF/refcount corruption), not a cross-boundary escape.\nC:H - The missed in6_dev_hold lets addrconf_rs_timer() put without a matching hold, which can free or leave inet6_dev at refcnt 0 while still reachable via the device, enabling a use-after-free read primitive.\nI:H - The same inet6_dev use-after-free/refcount corruption can be exploited for heap reuse and arbitrary write/control-flow hijack against the kernel network stack.\nA:H - Refcount underflow or premature destruction of inet6_dev leads to kernel WARN/oops, unstable networking state, or crash when the dangling idev is used." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/addrconf.c" ], "versions": [ { "version": "b7b1bfce0bb68bd8f6e62a28295922785cc63781", "lessThan": "c6395e32935d35e6f935e7caf1c2dac5a95943b4", "status": "affected", "versionType": "git" }, { "version": "b7b1bfce0bb68bd8f6e62a28295922785cc63781", "lessThan": "df62fdcd004afa72ecbed0e862ebb983acd3aa57", "status": "affected", "versionType": "git" }, { "version": "b7b1bfce0bb68bd8f6e62a28295922785cc63781", "lessThan": "c7eeba47058532f6077d6a658e38b6698f6ae71a", "status": "affected", "versionType": "git" }, { "version": "b7b1bfce0bb68bd8f6e62a28295922785cc63781", "lessThan": "2ad31ce40e8182860b631e37209e93e543790b7c", "status": "affected", "versionType": "git" }, { "version": "b7b1bfce0bb68bd8f6e62a28295922785cc63781", "lessThan": "82abd1c37d3bf2a2658b34772c17a25a6f9cca42", "status": "affected", "versionType": "git" }, { "version": "b7b1bfce0bb68bd8f6e62a28295922785cc63781", "lessThan": "436b7cc7eae7851c184b671ed7a4a64c750b86f7", "status": "affected", "versionType": "git" }, { "version": "b7b1bfce0bb68bd8f6e62a28295922785cc63781", "lessThan": "1f656e483eb4733d62f18dfb206a49b78f60f495", "status": "affected", "versionType": "git" }, { "version": "b7b1bfce0bb68bd8f6e62a28295922785cc63781", "lessThan": "06a0716949c22e2aefb648526580671197151acc", "status": "affected", "versionType": "git" }, { "version": "973d5956f754cfc306f5e274d71503498f4b0324", "status": "affected", "versionType": "git" }, { "version": "3.10.105", "lessThan": "3.11", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/addrconf.c" ], "versions": [ { "version": "3.11", "status": "affected" }, { "version": "0", "lessThan": "3.11", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.322", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.291", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.251", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.188", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.121", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.40", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.5", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "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": "3.11", "versionEndExcluding": "4.14.322" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "4.19.291" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.4.251" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.10.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.15.121" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.1.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.4.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10.105" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c6395e32935d35e6f935e7caf1c2dac5a95943b4" }, { "url": "https://git.kernel.org/stable/c/df62fdcd004afa72ecbed0e862ebb983acd3aa57" }, { "url": "https://git.kernel.org/stable/c/c7eeba47058532f6077d6a658e38b6698f6ae71a" }, { "url": "https://git.kernel.org/stable/c/2ad31ce40e8182860b631e37209e93e543790b7c" }, { "url": "https://git.kernel.org/stable/c/82abd1c37d3bf2a2658b34772c17a25a6f9cca42" }, { "url": "https://git.kernel.org/stable/c/436b7cc7eae7851c184b671ed7a4a64c750b86f7" }, { "url": "https://git.kernel.org/stable/c/1f656e483eb4733d62f18dfb206a49b78f60f495" }, { "url": "https://git.kernel.org/stable/c/06a0716949c22e2aefb648526580671197151acc" } ], "title": "ipv6/addrconf: fix a potential refcount underflow for idev", "x_generator": { "engine": "bippy-1.2.0" } } } }