{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50396", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:53:06.998Z", "datePublished": "2025-09-18T13:33:14.450Z", "dateUpdated": "2026-05-11T19:18:43.526Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:18:43.526Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: fix memory leak in tcindex_set_parms\n\nSyzkaller reports a memory leak as follows:\n====================================\nBUG: memory leak\nunreferenced object 0xffff88810c287f00 (size 256):\n comm \"syz-executor105\", pid 3600, jiffies 4294943292 (age 12.990s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n [] kmalloc_trace+0x20/0x90 mm/slab_common.c:1046\n [] kmalloc include/linux/slab.h:576 [inline]\n [] kmalloc_array include/linux/slab.h:627 [inline]\n [] kcalloc include/linux/slab.h:659 [inline]\n [] tcf_exts_init include/net/pkt_cls.h:250 [inline]\n [] tcindex_set_parms+0xa7/0xbe0 net/sched/cls_tcindex.c:342\n [] tcindex_change+0xdf/0x120 net/sched/cls_tcindex.c:553\n [] tc_new_tfilter+0x4f2/0x1100 net/sched/cls_api.c:2147\n [] rtnetlink_rcv_msg+0x4dc/0x5d0 net/core/rtnetlink.c:6082\n [] netlink_rcv_skb+0x87/0x1d0 net/netlink/af_netlink.c:2540\n [] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]\n [] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345\n [] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921\n [] sock_sendmsg_nosec net/socket.c:714 [inline]\n [] sock_sendmsg+0x56/0x80 net/socket.c:734\n [] ____sys_sendmsg+0x178/0x410 net/socket.c:2482\n [] ___sys_sendmsg+0xa8/0x110 net/socket.c:2536\n [] __sys_sendmmsg+0x105/0x330 net/socket.c:2622\n [] __do_sys_sendmmsg net/socket.c:2651 [inline]\n [] __se_sys_sendmmsg net/socket.c:2648 [inline]\n [] __x64_sys_sendmmsg+0x24/0x30 net/socket.c:2648\n [] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n [] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n [] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n====================================\n\nKernel uses tcindex_change() to change an existing\nfilter properties.\n\nYet the problem is that, during the process of changing,\nif `old_r` is retrieved from `p->perfect`, then\nkernel uses tcindex_alloc_perfect_hash() to newly\nallocate filter results, uses tcindex_filter_result_init()\nto clear the old filter result, without destroying\nits tcf_exts structure, which triggers the above memory leak.\n\nTo be more specific, there are only two source for the `old_r`,\naccording to the tcindex_lookup(). `old_r` is retrieved from\n`p->perfect`, or `old_r` is retrieved from `p->h`.\n\n * If `old_r` is retrieved from `p->perfect`, kernel uses\ntcindex_alloc_perfect_hash() to newly allocate the\nfilter results. Then `r` is assigned with `cp->perfect + handle`,\nwhich is newly allocated. So condition `old_r && old_r != r` is\ntrue in this situation, and kernel uses tcindex_filter_result_init()\nto clear the old filter result, without destroying\nits tcf_exts structure\n\n * If `old_r` is retrieved from `p->h`, then `p->perfect` is NULL\naccording to the tcindex_lookup(). Considering that `cp->h`\nis directly copied from `p->h` and `p->perfect` is NULL,\n`r` is assigned with `tcindex_lookup(cp, handle)`, whose value\nshould be the same as `old_r`, so condition `old_r && old_r != r`\nis false in this situation, kernel ignores using\ntcindex_filter_result_init() to clear the old filter result.\n\nSo only when `old_r` is retrieved from `p->perfect` does kernel use\ntcindex_filter_result_init() to clear the old filter result, which\ntriggers the above memory leak.\n\nConsidering that there already exists a tc_filter_wq workqueue\nto destroy the old tcindex_d\n---truncated---" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/cls_tcindex.c" ], "versions": [ { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "53af9c793f644d5841d84d8e0ad83bd7ab47f3e0", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77b", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "55ac68b53f1cea1926ee2313afc5d66b91daad71", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "7a6fb69bbcb21e9ce13bdf18c008c268874f0480", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "b314f6c3512108d7a656c5caf07c82d1bbbdc0f1", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "6c55953e232ea668731091d111066521f3b7719b", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "7c183dc0af472dec33d2c0786a5e356baa8cad19", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "c4de6057e7c6654983acb63d939d26ac0d7bbf39", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "facc4405e8b7407e03216207b1d1d640127de0c8", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "3abebc503a5148072052c229c6b04b329a420ecd", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "399ab7fe0fa0d846881685fd4e57e9a8ef7559f7", "status": "affected", "versionType": "git" }, { "version": "b9a24bb76bf611a5268ceffe04219e6ad264559b", "lessThan": "372ae77cf11d11fb118cbe2d37def9dd5f826abd", "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/cls_tcindex.c" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.308", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.276", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.235", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.173", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.87", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.100", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.19", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.5", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.18", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.5", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "4.9", "versionEndExcluding": "4.14.308" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "4.19.276" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.4.235" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.10.173" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.15.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.15.100" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.0.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.1.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.2.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/53af9c793f644d5841d84d8e0ad83bd7ab47f3e0" }, { "url": "https://git.kernel.org/stable/c/01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77b" }, { "url": "https://git.kernel.org/stable/c/55ac68b53f1cea1926ee2313afc5d66b91daad71" }, { "url": "https://git.kernel.org/stable/c/7a6fb69bbcb21e9ce13bdf18c008c268874f0480" }, { "url": "https://git.kernel.org/stable/c/b314f6c3512108d7a656c5caf07c82d1bbbdc0f1" }, { "url": "https://git.kernel.org/stable/c/18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6" }, { "url": "https://git.kernel.org/stable/c/6c55953e232ea668731091d111066521f3b7719b" }, { "url": "https://git.kernel.org/stable/c/7c183dc0af472dec33d2c0786a5e356baa8cad19" }, { "url": "https://git.kernel.org/stable/c/c4de6057e7c6654983acb63d939d26ac0d7bbf39" }, { "url": "https://git.kernel.org/stable/c/facc4405e8b7407e03216207b1d1d640127de0c8" }, { "url": "https://git.kernel.org/stable/c/3abebc503a5148072052c229c6b04b329a420ecd" }, { "url": "https://git.kernel.org/stable/c/399ab7fe0fa0d846881685fd4e57e9a8ef7559f7" }, { "url": "https://git.kernel.org/stable/c/372ae77cf11d11fb118cbe2d37def9dd5f826abd" } ], "title": "net: sched: fix memory leak in tcindex_set_parms", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-50396", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:51:54.692006Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:53:06.184Z" } } ] } }