{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2022-49840 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2022-49840 is a high-severity use after free vulnerability in Linux kernel, published on 1 May 2025. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2022-49840 and fix it if it is affected.\n\nWhat it is: CVE-2022-49840 is a high-severity use after free vulnerability in Linux kernel, published on 1 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2022-49840 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2022-49840/ (Markdown: https://insights.sbomify.com/CVE-2022-49840/index.md)","id":"CVE-2022-49840","markdown":"https://insights.sbomify.com/CVE-2022-49840/index.md","name":"CVE-2022-49840","record":{"aliases":["DEBIAN-CVE-2022-49840","GHSA-7crj-grwh-6247","UBUNTU-CVE-2022-49840"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel BPF test_run component allows attackers to cause a denial of service or potentially execute code via unaligned memory access.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"bpf, test_run: Fix alignment problem in bpf_prog_test_run_skb()","id":"CVE-2022-49840","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2022"},"n_packages":0,"n_references":7,"next":{"headline":"serial: imx: Add missing .thaw_noirq hook","id":"CVE-2022-49841"},"packages":[],"prev":{"headline":"scsi: scsi_transport_sas: Fix error handling in sas_phy_add()","id":"CVE-2022-49839"},"products":["Linux"],"published":"2025-05-01","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel BPF test_run component allows attackers to cause a denial of service or potentially execute code via unaligned memory access.","url":"https://insights.sbomify.com/CVE-2022-49840/"}