{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23171", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.982Z", "datePublished": "2026-02-14T16:01:33.489Z", "dateUpdated": "2026-08-05T12:20:26.019Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:26.019Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: fix use-after-free due to enslave fail after slave array update\n\nFix a use-after-free which happens due to enslave failure after the new\nslave has been added to the array. Since the new slave can be used for Tx\nimmediately, we can use it after it has been freed by the enslave error\ncleanup path which frees the allocated slave memory. Slave update array is\nsupposed to be called last when further enslave failures are not expected.\nMove it after xdp setup to avoid any problems.\n\nIt is very easy to reproduce the problem with a simple xdp_pass prog:\n ip l add bond1 type bond mode balance-xor\n ip l set bond1 up\n ip l set dev bond1 xdp object xdp_pass.o sec xdp_pass\n ip l add dumdum type dummy\n\nThen run in parallel:\n while :; do ip l set dumdum master bond1 1>/dev/null 2>&1; done;\n mausezahn bond1 -a own -b rand -A rand -B 1.1.1.1 -c 0 -t tcp \"dp=1-1023, flags=syn\"\n\nThe crash happens almost immediately:\n [ 605.602850] Oops: general protection fault, probably for non-canonical address 0xe0e6fc2460000137: 0000 [#1] SMP KASAN NOPTI\n [ 605.602916] KASAN: maybe wild-memory-access in range [0x07380123000009b8-0x07380123000009bf]\n [ 605.602946] CPU: 0 UID: 0 PID: 2445 Comm: mausezahn Kdump: loaded Tainted: G B 6.19.0-rc6+ #21 PREEMPT(voluntary)\n [ 605.602979] Tainted: [B]=BAD_PAGE\n [ 605.602998] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n [ 605.603032] RIP: 0010:netdev_core_pick_tx+0xcd/0x210\n [ 605.603063] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 3e 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6b 08 49 8d 7d 30 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 25 01 00 00 49 8b 45 30 4c 89 e2 48 89 ee 48 89\n [ 605.603111] RSP: 0018:ffff88817b9af348 EFLAGS: 00010213\n [ 605.603145] RAX: dffffc0000000000 RBX: ffff88817d28b420 RCX: 0000000000000000\n [ 605.603172] RDX: 00e7002460000137 RSI: 0000000000000008 RDI: 07380123000009be\n [ 605.603199] RBP: ffff88817b541a00 R08: 0000000000000001 R09: fffffbfff3ed8c0c\n [ 605.603226] R10: ffffffff9f6c6067 R11: 0000000000000001 R12: 0000000000000000\n [ 605.603253] R13: 073801230000098e R14: ffff88817d28b448 R15: ffff88817b541a84\n [ 605.603286] FS: 00007f6570ef67c0(0000) GS:ffff888221dfa000(0000) knlGS:0000000000000000\n [ 605.603319] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n [ 605.603343] CR2: 00007f65712fae40 CR3: 000000011371b000 CR4: 0000000000350ef0\n [ 605.603373] Call Trace:\n [ 605.603392] \n [ 605.603410] __dev_queue_xmit+0x448/0x32a0\n [ 605.603434] ? __pfx_vprintk_emit+0x10/0x10\n [ 605.603461] ? __pfx_vprintk_emit+0x10/0x10\n [ 605.603484] ? __pfx___dev_queue_xmit+0x10/0x10\n [ 605.603507] ? bond_start_xmit+0xbfb/0xc20 [bonding]\n [ 605.603546] ? _printk+0xcb/0x100\n [ 605.603566] ? __pfx__printk+0x10/0x10\n [ 605.603589] ? bond_start_xmit+0xbfb/0xc20 [bonding]\n [ 605.603627] ? add_taint+0x5e/0x70\n [ 605.603648] ? add_taint+0x2a/0x70\n [ 605.603670] ? end_report.cold+0x51/0x75\n [ 605.603693] ? bond_start_xmit+0xbfb/0xc20 [bonding]\n [ 605.603731] bond_start_xmit+0x623/0xc20 [bonding]" } ], "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 vulnerability is triggered via local netlink operations (ip link set ... master) which requires CAP_NET_ADMIN. This is a local attack vector through syscalls/ioctls, not remotely reachable via network packets.\nAC:L - The attacker controls both sides of the race — they trigger the enslave operation and the packet transmit concurrently. The commit confirms it is \"very easy to reproduce\" and crashes \"almost immediately.\" The attacker creates and controls the race conditions.\nPR:L - Requires CAP_NET_ADMIN, but this capability is obtainable by an unprivileged local user through user namespaces (unshare -Urn). Bond interfaces, dummy devices, and XDP programs can all be created within a user/network namespace.\nUI:N - No user interaction is required. The attacker can set up the bond device, XDP program, dummy slave, and trigger the race entirely on their own.\nS:U - The vulnerability affects the kernel within its own security scope. There is no crossing of security boundaries such as VM escape or IOMMU bypass.\nC:H - This is a use-after-free where the freed slave struct is accessed through the transmit array. An attacker can reallocate the freed memory with controlled content via heap spray, potentially reading arbitrary kernel memory through the slave struct's pointer fields.\nI:H - The use-after-free gives the attacker control over the freed slave object's contents through heap spraying. The Tx path dereferences pointers from the slave struct (e.g., slave->dev), enabling arbitrary write primitives and potential code execution.\nA:H - The vulnerability causes an immediate kernel oops/crash as demonstrated in the commit message, with access to wild memory addresses. This is trivially reproducible for a denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/bonding/bond_main.c" ], "versions": [ { "version": "9e2ee5c7e7c35d195e2aa0692a7241d47a433d1e", "lessThan": "172dcb67dd35b162357df229d7806acc724cd469", "status": "affected", "versionType": "git" }, { "version": "9e2ee5c7e7c35d195e2aa0692a7241d47a433d1e", "lessThan": "2889d92c5f728351c9930c7996d22fe6e906e785", "status": "affected", "versionType": "git" }, { "version": "9e2ee5c7e7c35d195e2aa0692a7241d47a433d1e", "lessThan": "bd25b092a06a3e05f7e8bd6da6fa7318777d8c3d", "status": "affected", "versionType": "git" }, { "version": "9e2ee5c7e7c35d195e2aa0692a7241d47a433d1e", "lessThan": "e9acda52fd2ee0cdca332f996da7a95c5fd25294", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/bonding/bond_main.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.90", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.9", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "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": "5.15", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.90" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/172dcb67dd35b162357df229d7806acc724cd469" }, { "url": "https://git.kernel.org/stable/c/2889d92c5f728351c9930c7996d22fe6e906e785" }, { "url": "https://git.kernel.org/stable/c/bd25b092a06a3e05f7e8bd6da6fa7318777d8c3d" }, { "url": "https://git.kernel.org/stable/c/e9acda52fd2ee0cdca332f996da7a95c5fd25294" } ], "title": "bonding: fix use-after-free due to enslave fail after slave array update", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-16T20:31:33.690171Z", "id": "CVE-2026-23171", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T20:31:44.839Z" } } ] } }