Answer in brief
CVE-2022-49977 records a High severity (CVSS 7.8) vulnerability in ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8a56d7761d2d041ae5e8215d20b4167d8aa93f51 <8569b4ada1e0b9bfaa125bd0c0967918b6560fa2 || >=8a56d7761d2d041ae5e8215d20b4167d8aa93f51 <4c34a2a6c9927c239dd2e295a03d49b37b618d2c || >=8a56d7761d2d041ae5e8215d20b4167d8aa93f51 <ddffe882d74ef43a3494f0ab0c24baf076c45f96 || >=8a56d7761d2d041ae5e8215d20b4167d8aa93f51 <934e49f7d696afdae9f979abe3f308408184e17b || >=8a56d7761d2d041ae5e8215d20b4167d8aa93f51 <dbd8c8fc60480e3faa3ae7e27ebe03371ecd1b77 || >=8a56d7761d2d041ae5e8215d20b4167d8aa93f51 <e4ae97295984ff1b9b340ed18ae1b066f36b7835 || >=8a56d7761d2d041ae5e8215d20b4167d8aa93f51 <d81bd6671f45fde4c3ac7fd7733c6e3082ae9d8e || >=8a56d7761d2d041ae5e8215d20b4167d8aa93f51 <c3b0f72e805f0801f05fa2aa52011c4bfc694c44 || 969a08e9048ddd0d655a19e692673cdb95116ce6 || 51d351d5b949ae7204696ada7ef502ed34d34fb0 || 2940c25bec92f40a3f7f32504b8ea115d1701892 || 189f4e672fc1c086f78818affc810ef29dda42a3 || >=3.2.54 <3.3 || >=3.4.72 <3.5 || >=3.10.22 <3.11 || >=3.12.3 <3.13 | 8569b4ada1e0b9bfaa125bd0c0967918b6560fa2, 4c34a2a6c9927c239dd2e295a03d49b37b618d2c, ddffe882d74ef43a3494f0ab0c24baf076c45f96, 934e49f7d696afdae9f979abe3f308408184e17b, dbd8c8fc60480e3faa3ae7e27ebe03371ecd1b77, e4ae97295984ff1b9b340ed18ae1b066f36b7835, d81bd6671f45fde4c3ac7fd7733c6e3082ae9d8e, c3b0f72e805f0801f05fa2aa52011c4bfc694c44, 3.3, 3.5, 3.11, 3.13 |
| Linux/Linuxgeneric | 3.13 | Not reported |
Published upstream
Jun 18, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead ftrace_startup does not remove ops from ftrace_ops_list when ftrace_startup_enable fails: register_ftrace_function ftrace_startup __register_ftrace_function ... add_ftrace_ops(&ftrace_ops_list, ops) ... ... ftrace_startup_enable // if ftrace failed to modify, ftrace_disabled is set to 1 ... return 0 // ops is in the ftrace_ops_list. When ftrace_disabled = 1, unregister_ftrace_function simply returns without doing anything: unregister_ftrace_function ftrace_shutdown if (unlikely(ftrace_disabled)) return -ENODEV; // return here, __unregister_ftrace_function is not executed, // as a result, ops is still in the ftrace_ops_list __unregister_ftrace_function ... If ops is dynamically allocated, it will be free later, in this case, is_ftrace_trampoline accesses NULL pointer: is_ftrace_trampoline ftrace_ops_trampoline do_for_each_ftrace_op(op, ftrace_ops_list) // OOPS! op may be NULL! Syzkaller reports as follows: [ 1203.506103] BUG: kernel NULL pointer dereference, address: 000000000000010b [ 1203.508039] #PF: supervisor read access in kernel mode [ 1203.508798] #PF: error_code(0x0000) - not-present page [ 1203.509558] PGD 800000011660b067 P4D 800000011660b067 PUD 130fb8067 PMD 0 [ 1203.510560] Oops: 0000 [#1] SMP KASAN PTI [ 1203.511189] CPU: 6 PID: 29532 Comm: syz-executor.2 Tainted: G B W 5.10.0 #8 [ 1203.512324] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 1203.513895] RIP: 0010:is_ftrace_trampoline+0x26/0xb0 [ 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 [ 1203.518838] RSP: 0018:ffffc900012cf960 EFLAGS: 00010246 [ 1203.520092] RAX: 0000000000000000 RBX: 000000000000007b RCX: ffffffff8a331866 [ 1203.521469] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 000000000000010b [ 1203.522583] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8df18b07 [ 1203.523550] R10: fffffbfff1be3160 R11: 0000000000000001 R12: 0000000000478399 [ 1203.524596] R13: 0000000000000000 R14: ffff888145088000 R15: 0000000000000008 [ 1203.525634] FS: 00007f429f5f4700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 [ 1203.526801] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1203.527626] CR2: 000000000000010b CR3: 0000000170e1e001 CR4: 00000000003706e0 [ 1203.528611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1203.529605] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Therefore, when ftrace_startup_enable fails, we need to rollback registration process and remove ops from ftrace_ops_list.
Quoted source text, attributed separately from HOL analysis.