{ "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-2022-49977", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49977", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-06-18T11:00:39.871Z", "updatedAt": "2026-08-05T08:56:59.013Z", "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": "ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead\n\nftrace_startup does not remove ops from ftrace_ops_list when\nftrace_startup_enable fails:\n\nregister_ftrace_function\n ftrace_startup\n __register_ftrace_function\n ...\n add_ftrace_ops(&ftrace_ops_list, ops)\n ...\n ...\n ftrace_startup_enable // if ftrace failed to modify, ftrace_disabled is set to 1\n ...\n return 0 // ops is in the ftrace_ops_list.\n\nWhen ftrace_disabled = 1, unregister_ftrace_function simply returns without doing anything:\nunregister_ftrace_function\n ftrace_shutdown\n if (unlikely(ftrace_disabled))\n return -ENODEV; // return here, __unregister_ftrace_function is not executed,\n // as a result, ops is still in the ftrace_ops_list\n __unregister_ftrace_function\n ...\n\nIf ops is dynamically allocated, it will be free later, in this case,\nis_ftrace_trampoline accesses NULL pointer:\n\nis_ftrace_trampoline\n ftrace_ops_trampoline\n do_for_each_ftrace_op(op, ftrace_ops_list) // OOPS! op may be NULL!\n\nSyzkaller reports as follows:\n[ 1203.506103] BUG: kernel NULL pointer dereference, address: 000000000000010b\n[ 1203.508039] #PF: supervisor read access in kernel mode\n[ 1203.508798] #PF: error_code(0x0000) - not-present page\n[ 1203.509558] PGD 800000011660b067 P4D 800000011660b067 PUD 130fb8067 PMD 0\n[ 1203.510560] Oops: 0000 [#1] SMP KASAN PTI\n[ 1203.511189] CPU: 6 PID: 29532 Comm: syz-executor.2 Tainted: G B W 5.10.0 #8\n[ 1203.512324] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n[ 1203.513895] RIP: 0010:is_ftrace_trampoline+0x26/0xb0\n[ 1203.514644] Code: ff eb d3 90 41 55 41 54 49 89 fc 55 53 e8 f2 00 fd ff 48 8b 1d 3b 35 5d 03 e8 e6 00 fd ff 48 8d bb 90 00 00 00 e8 2a 81 26 00 <48> 8b ab 90 00 00 00 48 85 ed 74 1d e8 c9 00 fd ff 48 8d bb 98 00\n[ 1203.518838] RSP: 0018:ffffc900012cf960 EFLAGS: 00010246\n[ 1203.520092] RAX: 0000000000000000 RBX: 000000000000007b RCX: ffffffff8a331866\n[ 1203.521469] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 000000000000010b\n[ 1203.522583] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8df18b07\n[ 1203.523550] R10: fffffbfff1be3160 R11: 0000000000000001 R12: 0000000000478399\n[ 1203.524596] R13: 0000000000000000 R14: ffff888145088000 R15: 0000000000000008\n[ 1203.525634] FS: 00007f429f5f4700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000\n[ 1203.526801] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 1203.527626] CR2: 000000000000010b CR3: 0000000170e1e001 CR4: 00000000003706e0\n[ 1203.528611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 1203.529605] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n\nTherefore, when ftrace_startup_enable fails, we need to rollback registration\nprocess and remove ops from ftrace_ops_list.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "8a56d7761d2d041ae5e8215d20b4167d8aa93f51", "status": "affected", "versionType": "git", "lessThan": "8569b4ada1e0b9bfaa125bd0c0967918b6560fa2" }, { "version": "8a56d7761d2d041ae5e8215d20b4167d8aa93f51", "status": "affected", "versionType": "git", "lessThan": "4c34a2a6c9927c239dd2e295a03d49b37b618d2c" }, { "version": "8a56d7761d2d041ae5e8215d20b4167d8aa93f51", "status": "affected", "versionType": "git", "lessThan": "ddffe882d74ef43a3494f0ab0c24baf076c45f96" }, { "version": "8a56d7761d2d041ae5e8215d20b4167d8aa93f51", "status": "affected", "versionType": "git", "lessThan": "934e49f7d696afdae9f979abe3f308408184e17b" }, { "version": "8a56d7761d2d041ae5e8215d20b4167d8aa93f51", "status": "affected", "versionType": "git", "lessThan": "dbd8c8fc60480e3faa3ae7e27ebe03371ecd1b77" }, { "version": "8a56d7761d2d041ae5e8215d20b4167d8aa93f51", "status": "affected", "versionType": "git", "lessThan": "e4ae97295984ff1b9b340ed18ae1b066f36b7835" }, { "version": "8a56d7761d2d041ae5e8215d20b4167d8aa93f51", "status": "affected", "versionType": "git", "lessThan": "d81bd6671f45fde4c3ac7fd7733c6e3082ae9d8e" }, { "version": "8a56d7761d2d041ae5e8215d20b4167d8aa93f51", "status": "affected", "versionType": "git", "lessThan": "c3b0f72e805f0801f05fa2aa52011c4bfc694c44" }, { "version": "969a08e9048ddd0d655a19e692673cdb95116ce6", "status": "affected", "versionType": "git" }, { "version": "51d351d5b949ae7204696ada7ef502ed34d34fb0", "status": "affected", "versionType": "git" }, { "version": "2940c25bec92f40a3f7f32504b8ea115d1701892", "status": "affected", "versionType": "git" }, { "version": "189f4e672fc1c086f78818affc810ef29dda42a3", "status": "affected", "versionType": "git" }, { "version": "3.2.54", "status": "affected", "versionType": "semver", "lessThan": "3.3" }, { "version": "3.4.72", "status": "affected", "versionType": "semver", "lessThan": "3.5" }, { "version": "3.10.22", "status": "affected", "versionType": "semver", "lessThan": "3.11" }, { "version": "3.12.3", "status": "affected", "versionType": "semver", "lessThan": "3.13" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.13", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.13" }, { "version": "4.9.327", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.292", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.257", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.212", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.141", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.65", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.19.7", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.19.*" }, { "version": "6.0", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }