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CVE-2022-49769— gfs2: Check sb_bsize_shift after reading superblock

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未检查sb_bsize_shift值，可能导致元数据损坏。

AI Predicted 4.3 Difficulty: Hard EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b3b94faa5fe5968827ba0640ee9fba4b3e7f736e< d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87 affected
b3b94faa5fe5968827ba0640ee9fba4b3e7f736e< 1ad197097343568066a8ffaa27ee7d0ae6d9f476 affected
b3b94faa5fe5968827ba0640ee9fba4b3e7f736e< 15c83fa0fd659dd9fbdc940a560b61236e876a80 affected
b3b94faa5fe5968827ba0640ee9fba4b3e7f736e< 8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2 affected
b3b94faa5fe5968827ba0640ee9fba4b3e7f736e< 5fa30be7ba81191b0a0c7239a89befc0c94286d5 affected
b3b94faa5fe5968827ba0640ee9fba4b3e7f736e< 28275a7c84d21c55ab3282d897f284d8d527173c affected
b3b94faa5fe5968827ba0640ee9fba4b3e7f736e< 16670534c7cff1acd918a6a5ec751b14e7436b76 affected
b3b94faa5fe5968827ba0640ee9fba4b3e7f736e< 670f8ce56dd0632dc29a0322e188cc73ce3c6b92 affected
… +10 more rows
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I. Basic Information for CVE-2022-49769

Vulnerability Information
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Vulnerability Title
gfs2: Check sb_bsize_shift after reading superblock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: gfs2: Check sb_bsize_shift after reading superblock Fuzzers like to scribble over sb_bsize_shift but in reality it's very unlikely that this field would be corrupted on its own. Nevertheless it should be checked to avoid the possibility of messy mount errors due to bad calculations. It's always a fixed value based on the block size so we can just check that it's the expected value. Tested with: mkfs.gfs2 -O -p lock_nolock /dev/vdb for i in 0 -1 64 65 32 33; do gfs2_edit -p sb field sb_bsize_shift $i /dev/vdb mount /dev/vdb /mnt/test && umount /mnt/test done Before this patch we get a withdraw after [ 76.413681] gfs2: fsid=loop0.0: fatal: invalid metadata block [ 76.413681] bh = 19 (type: exp=5, found=4) [ 76.413681] function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 492 and with UBSAN configured we also get complaints like [ 76.373395] UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:295:19 [ 76.373815] shift exponent 4294967287 is too large for 64-bit type 'long unsigned int' After the patch, these complaints don't appear, mount fails immediately and we get an explanation in dmesg.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未检查sb_bsize_shift值，可能导致元数据损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b3b94faa5fe5968827ba0640ee9fba4b3e7f736e ~ d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87 -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2022-49769

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III. Intelligence Information for CVE-2022-49769

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Patches & Fixes for CVE-2022-49769 (8)

Same Patch Batch · Linux · 2025-05-01 · 245 CVEs total

CVE-2025-37750 9.8 CRITICAL smb: client: fix UAF in decryption with multichannel
CVE-2025-37778 9.8 CRITICAL ksmbd: Fix dangling pointer in krb_authenticate
CVE-2022-49770 9.8 CRITICAL ceph: avoid putting the realm twice when decoding snaps fails
CVE-2022-49931 8.8 HIGH IB/hfi1: Correctly move list in sc_disable()
CVE-2025-37776 8.8 HIGH ksmbd: fix use-after-free in smb_break_all_levII_oplock()
CVE-2025-37777 8.8 HIGH ksmbd: fix use-after-free in __smb2_lease_break_noti()
CVE-2025-37790 8.8 HIGH net: mctp: Set SOCK_RCU_FREE
CVE-2022-49910 8.8 HIGH Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu
CVE-2022-49886 8.4 HIGH x86/tdx: Panic on bad configs that #VE on "private" memory access
CVE-2025-23159 8.4 HIGH media: venus: hfi: add a check to handle OOB in sfr region
CVE-2025-37749 8.2 HIGH net: ppp: Add bound checking for skb data on ppp_sync_txmung
CVE-2025-37765 7.8 HIGH drm/nouveau: prime: fix ttm_bo_delayed_delete oops
CVE-2025-37779 7.8 HIGH lib/iov_iter: fix to increase non slab folio refcount
CVE-2022-49920 7.8 HIGH netfilter: nf_tables: netlink notifier might race to release objects
CVE-2022-49919 7.8 HIGH netfilter: nf_tables: release flow rule object from commit path
CVE-2022-49921 7.8 HIGH net: sched: Fix use after free in red_enqueue()
CVE-2025-37752 7.8 HIGH net_sched: sch_sfq: move the limit validation
CVE-2025-37756 7.8 HIGH net: tls: explicitly disallow disconnect
CVE-2025-37761 7.8 HIGH drm/xe: Fix an out-of-bounds shift when invalidating TLB
CVE-2022-49804 7.8 HIGH s390: avoid using global register for current_stack_pointer

Showing top 20 of 245 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux