{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49087", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T01:49:39.248Z", "datePublished": "2025-02-26T01:54:44.557Z", "dateUpdated": "2026-08-05T08:53:49.787Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:49.787Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: fix a race in rxrpc_exit_net()\n\nCurrent code can lead to the following race:\n\nCPU0 CPU1\n\nrxrpc_exit_net()\n rxrpc_peer_keepalive_worker()\n if (rxnet->live)\n\n rxnet->live = false;\n del_timer_sync(&rxnet->peer_keepalive_timer);\n\n timer_reduce(&rxnet->peer_keepalive_timer, jiffies + delay);\n\n cancel_work_sync(&rxnet->peer_keepalive_work);\n\nrxrpc_exit_net() exits while peer_keepalive_timer is still armed,\nleading to use-after-free.\n\nsyzbot report was:\n\nODEBUG: free active (active state 0) object type: timer_list hint: rxrpc_peer_keepalive_timeout+0x0/0xb0\nWARNING: CPU: 0 PID: 3660 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505\nModules linked in:\nCPU: 0 PID: 3660 Comm: kworker/u4:6 Not tainted 5.17.0-syzkaller-13993-g88e6c0207623 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nWorkqueue: netns cleanup_net\nRIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505\nCode: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd 00 1c 26 8a 4c 89 ee 48 c7 c7 00 10 26 8a e8 b1 e7 28 05 <0f> 0b 83 05 15 eb c5 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3\nRSP: 0018:ffffc9000353fb00 EFLAGS: 00010082\nRAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000\nRDX: ffff888029196140 RSI: ffffffff815efad8 RDI: fffff520006a7f52\nRBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000\nR10: ffffffff815ea4ae R11: 0000000000000000 R12: ffffffff89ce23e0\nR13: ffffffff8a2614e0 R14: ffffffff816628c0 R15: dffffc0000000000\nFS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fe1f2908924 CR3: 0000000043720000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \n __debug_check_no_obj_freed lib/debugobjects.c:992 [inline]\n debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1023\n kfree+0xd6/0x310 mm/slab.c:3809\n ops_free_list.part.0+0x119/0x370 net/core/net_namespace.c:176\n ops_free_list net/core/net_namespace.c:174 [inline]\n cleanup_net+0x591/0xb00 net/core/net_namespace.c:598\n process_one_work+0x996/0x1610 kernel/workqueue.c:2289\n worker_thread+0x665/0x1080 kernel/workqueue.c:2436\n kthread+0x2e9/0x3a0 kernel/kthread.c:376\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298\n " } ], "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 triggered only during rxrpc_exit_net() on network-namespace teardown after a local AF_RXRPC socket arms the keepalive timer; remote RxRPC/AFS packets do not invoke this exit path.\nAC:L - The attacker controls both sides of the race by creating an AF_RXRPC socket (which starts the keepalive timer/worker) and destroying their own netns to run rxrpc_exit_net(), and can retry until the TOCTOU window is hit.\nPR:L - An unprivileged user can unshare a user+net namespace (CAP_SYS_ADMIN in their userns) and open AF_RXRPC sockets with no capability checks in rxrpc_create(), which is sufficient to arm the timer and trigger cleanup.\nUI:N - No victim action is required; the attacker alone creates the socket and tears down the netns to hit the race.\nS:U - This is a standard in-kernel UAF enabling local privilege escalation within the same kernel authority, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Use-after-free of the timer embedded in freed rxrpc_net/net_generic memory can be reclaimed and leveraged for arbitrary kernel memory disclosure primitives.\nI:H - A pending timer UAF is a classic control-flow hijack primitive (timer callback on reclaimed memory), enabling arbitrary write/code execution in the kernel.\nA:H - The race frees an armed timer_list (syzbot: ODEBUG free active timer), causing kernel warnings/oops or a crash when the stale timer later fires." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rxrpc/net_ns.c" ], "versions": [ { "version": "ace45bec6d77bc061c3c3d8ad99e298ea9800c2b", "lessThan": "864297ee30727ae6233f80296b7fc91442620b05", "status": "affected", "versionType": "git" }, { "version": "ace45bec6d77bc061c3c3d8ad99e298ea9800c2b", "lessThan": "7ee84d29f22de6f6c63fad6c54690517659862f1", "status": "affected", "versionType": "git" }, { "version": "ace45bec6d77bc061c3c3d8ad99e298ea9800c2b", "lessThan": "08ff0e74fab517dbc44e11b8bc683dd4ecc65950", "status": "affected", "versionType": "git" }, { "version": "ace45bec6d77bc061c3c3d8ad99e298ea9800c2b", "lessThan": "571d8e1d154ca18f08dcb72b69318d36e10010a0", "status": "affected", "versionType": "git" }, { "version": "ace45bec6d77bc061c3c3d8ad99e298ea9800c2b", "lessThan": "41024a40f6c793abbb916a857f18fb009f07464c", "status": "affected", "versionType": "git" }, { "version": "ace45bec6d77bc061c3c3d8ad99e298ea9800c2b", "lessThan": "cd8aef1f30d1215648e4e6686cfb422004851429", "status": "affected", "versionType": "git" }, { "version": "ace45bec6d77bc061c3c3d8ad99e298ea9800c2b", "lessThan": "1946014ca3b19be9e485e780e862c375c6f98bad", "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/rxrpc/net_ns.c" ], "versions": [ { "version": "4.17", "status": "affected" }, { "version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.238", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.189", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.111", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.34", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.20", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.3", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18", "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": "4.17", "versionEndExcluding": "4.19.238" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.4.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.10.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.16.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.17.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/864297ee30727ae6233f80296b7fc91442620b05" }, { "url": "https://git.kernel.org/stable/c/7ee84d29f22de6f6c63fad6c54690517659862f1" }, { "url": "https://git.kernel.org/stable/c/08ff0e74fab517dbc44e11b8bc683dd4ecc65950" }, { "url": "https://git.kernel.org/stable/c/571d8e1d154ca18f08dcb72b69318d36e10010a0" }, { "url": "https://git.kernel.org/stable/c/41024a40f6c793abbb916a857f18fb009f07464c" }, { "url": "https://git.kernel.org/stable/c/cd8aef1f30d1215648e4e6686cfb422004851429" }, { "url": "https://git.kernel.org/stable/c/1946014ca3b19be9e485e780e862c375c6f98bad" } ], "title": "rxrpc: fix a race in rxrpc_exit_net()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49087", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T18:17:30.562104Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-27T18:22:35.345Z" } } ] } }