{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49840", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-01T14:05:17.229Z", "datePublished": "2025-05-01T14:09:56.233Z", "dateUpdated": "2026-05-11T19:07:47.558Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:07:47.558Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, test_run: Fix alignment problem in bpf_prog_test_run_skb()\n\nWe got a syzkaller problem because of aarch64 alignment fault\nif KFENCE enabled. When the size from user bpf program is an odd\nnumber, like 399, 407, etc, it will cause the struct skb_shared_info's\nunaligned access. As seen below:\n\n BUG: KFENCE: use-after-free read in __skb_clone+0x23c/0x2a0 net/core/skbuff.c:1032\n\n Use-after-free read at 0xffff6254fffac077 (in kfence-#213):\n __lse_atomic_add arch/arm64/include/asm/atomic_lse.h:26 [inline]\n arch_atomic_add arch/arm64/include/asm/atomic.h:28 [inline]\n arch_atomic_inc include/linux/atomic-arch-fallback.h:270 [inline]\n atomic_inc include/asm-generic/atomic-instrumented.h:241 [inline]\n __skb_clone+0x23c/0x2a0 net/core/skbuff.c:1032\n skb_clone+0xf4/0x214 net/core/skbuff.c:1481\n ____bpf_clone_redirect net/core/filter.c:2433 [inline]\n bpf_clone_redirect+0x78/0x1c0 net/core/filter.c:2420\n bpf_prog_d3839dd9068ceb51+0x80/0x330\n bpf_dispatcher_nop_func include/linux/bpf.h:728 [inline]\n bpf_test_run+0x3c0/0x6c0 net/bpf/test_run.c:53\n bpf_prog_test_run_skb+0x638/0xa7c net/bpf/test_run.c:594\n bpf_prog_test_run kernel/bpf/syscall.c:3148 [inline]\n __do_sys_bpf kernel/bpf/syscall.c:4441 [inline]\n __se_sys_bpf+0xad0/0x1634 kernel/bpf/syscall.c:4381\n\n kfence-#213: 0xffff6254fffac000-0xffff6254fffac196, size=407, cache=kmalloc-512\n\n allocated by task 15074 on cpu 0 at 1342.585390s:\n kmalloc include/linux/slab.h:568 [inline]\n kzalloc include/linux/slab.h:675 [inline]\n bpf_test_init.isra.0+0xac/0x290 net/bpf/test_run.c:191\n bpf_prog_test_run_skb+0x11c/0xa7c net/bpf/test_run.c:512\n bpf_prog_test_run kernel/bpf/syscall.c:3148 [inline]\n __do_sys_bpf kernel/bpf/syscall.c:4441 [inline]\n __se_sys_bpf+0xad0/0x1634 kernel/bpf/syscall.c:4381\n __arm64_sys_bpf+0x50/0x60 kernel/bpf/syscall.c:4381\n\nTo fix the problem, we adjust @size so that (@size + @hearoom) is a\nmultiple of SMP_CACHE_BYTES. So we make sure the struct skb_shared_info\nis aligned to a cache line." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bpf/test_run.c" ], "versions": [ { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "lessThan": "047824a730699c6c66df43306b80f700c9dfc2fd", "status": "affected", "versionType": "git" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "lessThan": "730fb1ef974a13915bc7651364d8b3318891cd70", "status": "affected", "versionType": "git" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "lessThan": "7a704dbfd3735304e261f2787c52fbc7c3884736", "status": "affected", "versionType": "git" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "lessThan": "e60f37a1d379c821c17b08f366412dce9ef3d99f", "status": "affected", "versionType": "git" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "lessThan": "eaa8edd86514afac9deb9bf9a5053e74f37edf40", "status": "affected", "versionType": "git" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "lessThan": "1b597f2d6a55e9f549989913860ad5170da04964", "status": "affected", "versionType": "git" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "lessThan": "d3fd203f36d46aa29600a72d57a1b61af80e4a25", "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/bpf/test_run.c" ], "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.300", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.267", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.225", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.156", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.80", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.10", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "4.12", "versionEndExcluding": "4.14.300" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "4.19.267" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.4.225" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.10.156" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.15.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/047824a730699c6c66df43306b80f700c9dfc2fd" }, { "url": "https://git.kernel.org/stable/c/730fb1ef974a13915bc7651364d8b3318891cd70" }, { "url": "https://git.kernel.org/stable/c/7a704dbfd3735304e261f2787c52fbc7c3884736" }, { "url": "https://git.kernel.org/stable/c/e60f37a1d379c821c17b08f366412dce9ef3d99f" }, { "url": "https://git.kernel.org/stable/c/eaa8edd86514afac9deb9bf9a5053e74f37edf40" }, { "url": "https://git.kernel.org/stable/c/1b597f2d6a55e9f549989913860ad5170da04964" }, { "url": "https://git.kernel.org/stable/c/d3fd203f36d46aa29600a72d57a1b61af80e4a25" } ], "title": "bpf, test_run: Fix alignment problem in bpf_prog_test_run_skb()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free" } ] } ], "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": { "timestamp": "2025-10-01T17:01:06.257546Z", "id": "CVE-2022-49840", "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": "2025-10-01T17:01:08.580Z" } } ] } }