{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-49840", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49840", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-05-01T14:09:56.233Z", "updatedAt": "2026-05-11T19:07:47.558Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "bpf, test_run: Fix alignment problem in bpf_prog_test_run_skb()", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "status": "affected", "versionType": "git", "lessThan": "047824a730699c6c66df43306b80f700c9dfc2fd" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "status": "affected", "versionType": "git", "lessThan": "730fb1ef974a13915bc7651364d8b3318891cd70" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "status": "affected", "versionType": "git", "lessThan": "7a704dbfd3735304e261f2787c52fbc7c3884736" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "status": "affected", "versionType": "git", "lessThan": "e60f37a1d379c821c17b08f366412dce9ef3d99f" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "status": "affected", "versionType": "git", "lessThan": "eaa8edd86514afac9deb9bf9a5053e74f37edf40" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "status": "affected", "versionType": "git", "lessThan": "1b597f2d6a55e9f549989913860ad5170da04964" }, { "version": "1cf1cae963c2e6032aebe1637e995bc2f5d330f4", "status": "affected", "versionType": "git", "lessThan": "d3fd203f36d46aa29600a72d57a1b61af80e4a25" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.12" }, { "version": "4.14.300", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.267", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.225", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.156", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.80", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.0.10", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }