CVE-2022-49307: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean()
Vulnerability summary
CVE-2022-49307 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 21.7% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 6Timeline
- 26-02-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() When the driver fails at alloc_hdlcdev(), and then we remove the driver module, we will get the following splat: [ 25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI [ 25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] [ 25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0 [ 25.077709] Call Trace: [ 25.077924] <TASK> [ 25.078108] unregister_hdlc_device+0x16/0x30 [ 25.078481] slgt_cleanup+0x157/0x9f0 [synclink_gt] Fix this by checking whether the 'info->netdev' is a null pointer first.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.29%
Chance of exploitation in the next 30 days
Percentile
22%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.29% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu112 products
- linuxAll versions (No fix recorded) | < 4.15.0-192.203 | < 5.4.0-126.142 | < 5.15.0-48.54
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1140.151 | < 5.4.0-1085.92 | < 5.15.0-1020.24
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d | ≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < 078212ad15dbd88840c82c97f12c93d83703c8fd | ≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < ba08cbc5b53e151d0acf1930fb526fc65b7f3e65 | ≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < f6e07eb7ebec53ffe81fc2489589320fbe4a6b75 | ≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < d68d5e68b7f64de7170f8e04dd9b995c36b2c71c | ≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < 8a95696bdc0e13f8980f05b54a3b9081963d1256 | ≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < ddd67751ab86c6a65f95c35293c42f85a42ac05d | ≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < 1ceb4ca9543a8a788febf6bc8dad2e605e172d5e | ≥ 705b6c7b34f2621f95f606d0e683daa10cdb8eb9, < 689ca31c542687709ba21ec2195c1fbce34fd029 | 2.6.16
- linux_kernel< 4.9.318 | ≥ 4.10, < 4.14.283 | ≥ 4.15, < 4.19.247 | ≥ 4.20, < 5.4.198 | ≥ 5.5, < 5.10.122 | ≥ 5.11, < 5.15.47 | ≥ 5.16, < 5.17.15 | ≥ 5.18, < 5.18.4
Debian1 product
- linux< 5.18.5-1
3 vendors · 115 products
