{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26739", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.166Z", "datePublished": "2024-04-03T17:00:24.879Z", "dateUpdated": "2026-08-05T11:26:57.172Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:57.172Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_mirred: don't override retval if we already lost the skb\n\nIf we're redirecting the skb, and haven't called tcf_mirred_forward(),\nyet, we need to tell the core to drop the skb by setting the retcode\nto SHOT. If we have called tcf_mirred_forward(), however, the skb\nis out of our hands and returning SHOT will lead to UaF.\n\nMove the retval override to the error path which actually need it." } ], "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 configuration (ingress qdisc + filter with an act_mirred redirect) must be installed locally via rtnetlink, and the attacker drives the trigger by injecting frames locally into that device. Per kernel scoring convention, tc/qdisc netlink-configured paths are Local.\nAC:L - There is no race or memory-layout precondition; the attacker fully controls both the mirred configuration and the drop condition (unhandled ethertype, or a drop filter/saturated qdisc on the target device), so every injected packet deterministically produces the double free.\nPR:L - Configuring the mirred action requires only CAP_NET_ADMIN within a network namespace, which any unprivileged user obtains via `unshare -Urn`; CAP_NET_RAW in that same user namespace supplies the AF_PACKET frame injection.\nUI:N - The attacker sets up the qdisc/filter and sends the packets entirely on their own; no action by any other user or administrator is needed.\nS:U - The corruption is confined to the kernel's own heap and privilege domain; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - The skb and its data buffer are freed twice, so the same slab object is handed to two owners; this use-after-free lets an attacker read the contents of a kernel object aliased onto the reclaimed skb, giving arbitrary kernel memory disclosure.\nI:H - The same double-free/UAF primitive permits heap spraying of the reclaimed skb with attacker-controlled data, yielding a write primitive over adjacent kernel structures and a path to control-flow hijack and privilege escalation.\nA:H - Even without further exploitation, freeing an already-freed skb corrupts the slab freelist and reliably triggers a kernel oops/panic (or BUG on a debug kernel), and it can be repeated at packet rate." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/act_mirred.c" ], "versions": [ { "version": "e5cf1baf92cb785b90390db1c624948e70c8b8bd", "lessThan": "0117fe0a4615a7c8d30d6ebcbf87332fbe63e6fd", "status": "affected", "versionType": "git" }, { "version": "e5cf1baf92cb785b90390db1c624948e70c8b8bd", "lessThan": "9d3ef89b6a5e9f2e940de2cef3d543be0be8dec5", "status": "affected", "versionType": "git" }, { "version": "e5cf1baf92cb785b90390db1c624948e70c8b8bd", "lessThan": "e873e8f7d03a2ee5b77fb1a305c782fed98e2754", "status": "affected", "versionType": "git" }, { "version": "e5cf1baf92cb785b90390db1c624948e70c8b8bd", "lessThan": "28cdbbd38a4413b8eff53399b3f872fd4e80db9d", "status": "affected", "versionType": "git" }, { "version": "e5cf1baf92cb785b90390db1c624948e70c8b8bd", "lessThan": "f4e294bbdca8ac8757db436fc82214f3882fc7e7", "status": "affected", "versionType": "git" }, { "version": "e5cf1baf92cb785b90390db1c624948e70c8b8bd", "lessThan": "166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210", "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/sched/act_mirred.c" ], "versions": [ { "version": "4.19", "status": "affected" }, { "version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.238", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.182", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.136", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.19", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.7", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "4.19", "versionEndExcluding": "5.10.238" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.15.182" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.1.136" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.7.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0117fe0a4615a7c8d30d6ebcbf87332fbe63e6fd" }, { "url": "https://git.kernel.org/stable/c/9d3ef89b6a5e9f2e940de2cef3d543be0be8dec5" }, { "url": "https://git.kernel.org/stable/c/e873e8f7d03a2ee5b77fb1a305c782fed98e2754" }, { "url": "https://git.kernel.org/stable/c/28cdbbd38a4413b8eff53399b3f872fd4e80db9d" }, { "url": "https://git.kernel.org/stable/c/f4e294bbdca8ac8757db436fc82214f3882fc7e7" }, { "url": "https://git.kernel.org/stable/c/166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210" } ], "title": "net/sched: act_mirred: don't override retval if we already lost the skb", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/28cdbbd38a4413b8eff53399b3f872fd4e80db9d", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/f4e294bbdca8ac8757db436fc82214f3882fc7e7", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:29:31.734Z" } }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-26739", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:51:53.930424Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:18.399Z" } } ] } }