{ "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-2026-53111", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-53111", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-06-24T16:30:44.691Z", "updatedAt": "2026-06-24T16:30:44.691Z", "importedAt": "2026-10-24T01:58:20.586Z", "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 the null pointer dereference issue in bpf_lwt_xmit_push_encap", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap\n\nThe bpf_lwt_xmit_push_encap helper needs to access skb_dst(skb)->dev to\ncalculate the needed headroom:\n\n\terr = skb_cow_head(skb,\n\t\t\t len + LL_RESERVED_SPACE(skb_dst(skb)->dev));\n\nBut skb->_skb_refdst may not be initialized when the skb is set up by\nbpf_prog_test_run_skb function. Executing bpf_lwt_push_ip_encap function\nin this scenario will trigger null pointer dereference, causing a kernel\ncrash as Yinhao reported:\n\n[ 105.186365] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[ 105.186382] #PF: supervisor read access in kernel mode\n[ 105.186388] #PF: error_code(0x0000) - not-present page\n[ 105.186393] PGD 121d3d067 P4D 121d3d067 PUD 106c83067 PMD 0\n[ 105.186404] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[ 105.186412] CPU: 3 PID: 3250 Comm: poc Kdump: loaded Not tainted 6.19.0-rc5 #1\n[ 105.186423] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[ 105.186427] RIP: 0010:bpf_lwt_push_ip_encap+0x1eb/0x520\n[ 105.186443] Code: 0f 84 de 01 00 00 0f b7 4a 04 66 85 c9 0f 85 47 01 00 00 31 c0 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc 48 8b 73 58 48 83 e6 fe <48> 8b 36 0f b7 be ec 00 00 00 0f b7 b6 e6 00 00 00 01 fe 83 e6 f0\n[ 105.186449] RSP: 0018:ffffbb0e0387bc50 EFLAGS: 00010246\n[ 105.186455] RAX: 000000000000004e RBX: ffff94c74e036500 RCX: ffff94c74874da00\n[ 105.186460] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff94c74e036500\n[ 105.186463] RBP: 0000000000000001 R08: 0000000000000002 R09: 0000000000000000\n[ 105.186467] R10: ffffbb0e0387bd50 R11: 0000000000000000 R12: ffffbb0e0387bc98\n[ 105.186471] R13: 0000000000000014 R14: 0000000000000000 R15: 0000000000000002\n[ 105.186484] FS: 00007f166aa4d680(0000) GS:ffff94c8b7780000(0000) knlGS:0000000000000000\n[ 105.186490] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 105.186494] CR2: 0000000000000000 CR3: 000000015eade001 CR4: 0000000000770ee0\n[ 105.186499] PKRU: 55555554\n[ 105.186502] Call Trace:\n[ 105.186507] \n[ 105.186513] bpf_lwt_xmit_push_encap+0x2b/0x40\n[ 105.186522] bpf_prog_a75eaad51e517912+0x41/0x49\n[ 105.186536] ? kvm_clock_get_cycles+0x18/0x30\n[ 105.186547] ? ktime_get+0x3c/0xa0\n[ 105.186554] bpf_test_run+0x195/0x320\n[ 105.186563] ? bpf_test_run+0x10f/0x320\n[ 105.186579] bpf_prog_test_run_skb+0x2f5/0x4f0\n[ 105.186590] __sys_bpf+0x69c/0xa40\n[ 105.186603] __x64_sys_bpf+0x1e/0x30\n[ 105.186611] do_syscall_64+0x59/0x110\n[ 105.186620] entry_SYSCALL_64_after_hwframe+0x76/0xe0\n[ 105.186649] RIP: 0033:0x7f166a97455d\n\nTemporarily add the setting of skb->_skb_refdst before bpf_test_run to resolve the issue.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "52f278774e796a553be0c869dcaaee6f259ca795", "status": "affected", "versionType": "git", "lessThan": "5c8d1f91fc4898d79f29d79c1a6f7c2b3ee66fb0" }, { "version": "52f278774e796a553be0c869dcaaee6f259ca795", "status": "affected", "versionType": "git", "lessThan": "c7ad31fb948fdd4905263f4324160682c3fa7bc6" }, { "version": "52f278774e796a553be0c869dcaaee6f259ca795", "status": "affected", "versionType": "git", "lessThan": "599905c3f10bb83e6e6881d5a7f5cea5df07dc23" }, { "version": "52f278774e796a553be0c869dcaaee6f259ca795", "status": "affected", "versionType": "git", "lessThan": "5500913516e071dbe23e5a404c861dd2d82c9589" }, { "version": "52f278774e796a553be0c869dcaaee6f259ca795", "status": "affected", "versionType": "git", "lessThan": "94f95328b9070909b5b875c647b17a11d3d85567" }, { "version": "52f278774e796a553be0c869dcaaee6f259ca795", "status": "affected", "versionType": "git", "lessThan": "972787479ee73006fddb5e59ab5c8e733810ff42" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.1" }, { "version": "6.1.175", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.141", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.91", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.33", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.0.10", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.0.*" }, { "version": "7.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }