CVE-2022-50553
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-50553
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50553.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-50553
- Downstream
- Related
- Published
- 2025-10-07T15:21:14.729Z
- Modified
- 2025-12-04T23:34:05.128523Z
- Summary
- tracing/hist: Fix out-of-bound write on 'action_data.var_ref_idx'
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
tracing/hist: Fix out-of-bound write on 'actiondata.varref_idx'
When generate a synthetic event with many params and then create a trace action for it [1], kernel panic happened [2].
It is because that in traceactioncreate() 'data->nparams' is up to SYNTHFIELDSMAX (current value is 64), and array 'data->varrefidx' keeps indices into array 'histdata->varrefs' for each synthetic event param, but the length of 'data->varrefidx' is TRACINGMAPVARSMAX (current value is 16), so out-of-bound write happened when 'data->nparams' more than 16. In this case, 'data->matchdata.event' is overwritten and eventually cause the panic.
To solve the issue, adjust the length of 'data->varrefidx' to be SYNTHFIELDSMAX and add sanity checks to avoid out-of-bound write.
[1] # cd /sys/kernel/tracing/ # echo "mysynthevent int v1; int v2; int v3; int v4; int v5; int v6;\ int v7; int v8; int v9; int v10; int v11; int v12; int v13; int v14;\ int v15; int v16; int v17; int v18; int v19; int v20; int v21; int v22;\ int v23; int v24; int v25; int v26; int v27; int v28; int v29; int v30;\ int v31; int v32; int v33; int v34; int v35; int v36; int v37; int v38;\ int v39; int v40; int v41; int v42; int v43; int v44; int v45; int v46;\ int v47; int v48; int v49; int v50; int v51; int v52; int v53; int v54;\ int v55; int v56; int v57; int v58; int v59; int v60; int v61; int v62;\ int v63" >> syntheticevents # echo 'hist:keys=pid:ts0=commontimestamp.usecs if comm=="bash"' >> \ events/sched/schedwaking/trigger # echo "hist:keys=nextpid:onmatch(sched.schedwaking).mysynthevent(\ pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,\ pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,\ pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,pid,\ pid,pid,pid,pid,pid,pid,pid,pid,pid)" >> events/sched/schedswitch/trigger
[2] BUG: unable to handle page fault for address: ffff91c900000000 PGD 61001067 P4D 61001067 PUD 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 2 PID: 322 Comm: bash Tainted: G W 6.1.0-rc8+ #229 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014 RIP: 0010:strcmp+0xc/0x30 Code: 75 f7 31 d2 44 0f b6 04 16 44 88 04 11 48 83 c2 01 45 84 c0 75 ee c3 cc cc cc cc 0f 1f 00 31 c0 eb 08 48 83 c0 01 84 d2 74 13 <0f> b6 14 07 3a 14 06 74 ef 19 c0 83 c8 01 c3 cc cc cc cc 31 c3 RSP: 0018:ffff9b3b00f53c48 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffffba958a68 RCX: 0000000000000000 RDX: 0000000000000010 RSI: ffff91c943d33a90 RDI: ffff91c900000000 RBP: ffff91c900000000 R08: 00000018d604b529 R09: 0000000000000000 R10: ffff91c9483eddb1 R11: ffff91ca483eddab R12: ffff91c946171580 R13: ffff91c9479f0538 R14: ffff91c9457c2848 R15: ffff91c9479f0538 FS: 00007f1d1cfbe740(0000) GS:ffff91c9bdc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff91c900000000 CR3: 0000000006316000 CR4: 00000000000006e0 Call Trace: <TASK> _findeventfile+0x55/0x90 actioncreate+0x76c/0x1060 eventhisttriggerparse+0x146d/0x2060 ? eventtriggerwrite+0x31/0xd0 triggerprocessregex+0xbb/0x110 eventtriggerwrite+0x6b/0xd0 vfswrite+0xc8/0x3e0 ? allocfd+0xc0/0x160 ? preemptcountadd+0x4d/0xa0 ? preemptcountadd+0x70/0xa0 ksyswrite+0x5f/0xe0 dosyscall64+0x3b/0x90 entrySYSCALL64afterhwframe+0x63/0xcd RIP: 0033:0x7f1d1d0cf077 Code: 64 89 02 48 c7 c0 ff ff ff ff eb bb 0f 1f 80 00 00 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 RSP: 002b:00007ffcebb0e568 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000143 RCX: 00007f1d1d0cf077 RDX: 0000000000000143 RSI: 00005639265aa7e0 RDI: 0000000000000001 RBP: 00005639265aa7e0 R08: 000000000000000a R09: 0000000000000142 R ---truncated---
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50553.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/04241956ce8825ff06e06e4083e7b692e9d5f712
- https://git.kernel.org/stable/c/0cb31bd88361edb96cfc622648717ba348f0f4dc
- https://git.kernel.org/stable/c/15697f653399253f9be4ed2a1e03d795f3cfee94
- https://git.kernel.org/stable/c/82470f7d9044842618c847a7166de2b7458157a7
- https://git.kernel.org/stable/c/b4efdc219fb8cfa066c7042e636ab8ad6d7e7494
- https://git.kernel.org/stable/c/cf79d5410a569dad1d4112b5c3c02383cca8213a
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50553.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-50553
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced38b67e60b6b582e81f9db1b2e7176cbbfbd3e574Fixedcf79d5410a569dad1d4112b5c3c02383cca8213a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd380dcde9a07ca5de4805dee11f58a98ec0ad6ffFixed0cb31bd88361edb96cfc622648717ba348f0f4dcFixed15697f653399253f9be4ed2a1e03d795f3cfee94Fixedb4efdc219fb8cfa066c7042e636ab8ad6d7e7494Fixed04241956ce8825ff06e06e4083e7b692e9d5f712Fixed82470f7d9044842618c847a7166de2b7458157a7
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedLast affectedc78a2baf5e1fe1b38121d6b54bab77ccb81a1a86
Affected versions
v2.*
v3.*
v4.*
v5.*
v6.*
Linux / Kernel
Package
- Name
- Kernel
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed5.4.229
- Type
- ECOSYSTEM
- Events
-
Introduced5.5.0Fixed5.10.163
- Type
- ECOSYSTEM
- Events
-
Introduced5.6.0Fixed5.15.87
- Type
- ECOSYSTEM
- Events
-
Introduced5.11.0Fixed6.0.18
- Type
- ECOSYSTEM
- Events
-
Introduced5.16.0Fixed6.1.4