{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23245", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.989Z", "datePublished": "2026-03-18T10:05:07.406Z", "dateUpdated": "2026-08-05T12:20:54.157Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:54.157Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_gate: snapshot parameters with RCU on replace\n\nThe gate action can be replaced while the hrtimer callback or dump path is\nwalking the schedule list.\n\nConvert the parameters to an RCU-protected snapshot and swap updates under\ntcf_lock, freeing the previous snapshot via call_rcu(). When REPLACE omits\nthe entry list, preserve the existing schedule so the effective state is\nunchanged." } ], "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 - This is a tc/netlink qdisc action (act_gate) configured via RTM_NEWTFILTER/RTM_NEWACTION netlink messages, requiring local system access through a netlink socket.\nAC:L - The attacker controls both sides of the race by creating a gate action with a short timer interval and then issuing a REPLACE operation with different clock parameters, reliably triggering the lock-drop window in gate_setup_timer. The error-path UAF is even more reliable.\nPR:L - CAP_NET_ADMIN is required but rtnetlink_rcv_msg uses netlink_net_capable() which checks the capability in the network namespace's user_ns, so an unprivileged user can reach this code via unshare -Urn.\nUI:N - No user interaction is needed; the attacker creates the gate action, triggers the timer, and issues the replace operation entirely on their own.\nS:U - The vulnerability affects the kernel within the same security authority; there is no crossing of a virtualization or sandbox boundary.\nC:H - The use-after-free on the replace error path allows the timer callback to read freed heap memory, and an attacker can spray controlled data into the freed slab to leak arbitrary kernel memory.\nI:H - The use-after-free gives the attacker control over freed list entry objects; via heap spraying, this can be leveraged into arbitrary kernel write primitives and control flow hijacking.\nA:H - Dereferencing freed memory in the timer callback will cause a kernel crash/oops, and the race condition itself can corrupt linked list state leading to NULL pointer dereferences or infinite loops." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/tc_act/tc_gate.h", "net/sched/act_gate.c" ], "versions": [ { "version": "a51c328df3106663879645680609eb49b3ff6444", "lessThan": "fc98fd8d214693be91253d9a88cdf8e5e143d124", "status": "affected", "versionType": "git" }, { "version": "a51c328df3106663879645680609eb49b3ff6444", "lessThan": "8b1251bbf0f10ac745ed74bad4d3b433caa1eeae", "status": "affected", "versionType": "git" }, { "version": "a51c328df3106663879645680609eb49b3ff6444", "lessThan": "dfc314d7c767e350f78a46a8f8b134f80e8ad432", "status": "affected", "versionType": "git" }, { "version": "a51c328df3106663879645680609eb49b3ff6444", "lessThan": "035d0d09d5ab3ed3e93d18cde2b562a6719eea23", "status": "affected", "versionType": "git" }, { "version": "a51c328df3106663879645680609eb49b3ff6444", "lessThan": "04d75529dc0f9be78786162ebab7424af4644df2", "status": "affected", "versionType": "git" }, { "version": "a51c328df3106663879645680609eb49b3ff6444", "lessThan": "58b162e318d0243ad2d7d92456c0873f2494c351", "status": "affected", "versionType": "git" }, { "version": "a51c328df3106663879645680609eb49b3ff6444", "lessThan": "62413a9c3cb183afb9bb6e94dd68caf4e4145f4c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/tc_act/tc_gate.h", "net/sched/act_gate.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.18", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.8", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "5.8", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.19.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fc98fd8d214693be91253d9a88cdf8e5e143d124" }, { "url": "https://git.kernel.org/stable/c/8b1251bbf0f10ac745ed74bad4d3b433caa1eeae" }, { "url": "https://git.kernel.org/stable/c/dfc314d7c767e350f78a46a8f8b134f80e8ad432" }, { "url": "https://git.kernel.org/stable/c/035d0d09d5ab3ed3e93d18cde2b562a6719eea23" }, { "url": "https://git.kernel.org/stable/c/04d75529dc0f9be78786162ebab7424af4644df2" }, { "url": "https://git.kernel.org/stable/c/58b162e318d0243ad2d7d92456c0873f2494c351" }, { "url": "https://git.kernel.org/stable/c/62413a9c3cb183afb9bb6e94dd68caf4e4145f4c" } ], "title": "net/sched: act_gate: snapshot parameters with RCU on replace", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:46:15.971Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC 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"https://cert-portal.siemens.com/productcert/html/ssa-019113.html" } ] } ] } }