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CVE-2024-49880— ext4: fix off by one issue in alloc_flex_gd()

AI Predicted 5.5 Difficulty: Easy EPSS 0.24% · P16

Possible ATT&CK Techniques 1AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux665d3e0af4d35acf9a5f58dfd471bc27dbf55880< 0d80d2b8bf613398baf7185009e35f9d0459ecb0affected
665d3e0af4d35acf9a5f58dfd471bc27dbf55880< acb559d6826116cc113598640d105094620c2526affected
665d3e0af4d35acf9a5f58dfd471bc27dbf55880< 6121258c2b33ceac3d21f6a221452692c465df88affected
6.8affected
< 6.8unaffected
6.10.14≤ 6.10.*unaffected
6.11.3≤ 6.11.*unaffected
6.12≤ *unaffected
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I. Basic Information for CVE-2024-49880

Vulnerability Information
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Vulnerability Title
ext4: fix off by one issue in alloc_flex_gd()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix off by one issue in alloc_flex_gd() Wesley reported an issue: ================================================================== EXT4-fs (dm-5): resizing filesystem from 7168 to 786432 blocks ------------[ cut here ]------------ kernel BUG at fs/ext4/resize.c:324! CPU: 9 UID: 0 PID: 3576 Comm: resize2fs Not tainted 6.11.0+ #27 RIP: 0010:ext4_resize_fs+0x1212/0x12d0 Call Trace: __ext4_ioctl+0x4e0/0x1800 ext4_ioctl+0x12/0x20 __x64_sys_ioctl+0x99/0xd0 x64_sys_call+0x1206/0x20d0 do_syscall_64+0x72/0x110 entry_SYSCALL_64_after_hwframe+0x76/0x7e ================================================================== While reviewing the patch, Honza found that when adjusting resize_bg in alloc_flex_gd(), it was possible for flex_gd->resize_bg to be bigger than flexbg_size. The reproduction of the problem requires the following: o_group = flexbg_size * 2 * n; o_size = (o_group + 1) * group_size; n_group: [o_group + flexbg_size, o_group + flexbg_size * 2) o_size = (n_group + 1) * group_size; Take n=0,flexbg_size=16 as an example: last:15 |o---------------|--------------n-| o_group:0 resize to n_group:30 The corresponding reproducer is: img=test.img rm -f $img truncate -s 600M $img mkfs.ext4 -F $img -b 1024 -G 16 8M dev=`losetup -f --show $img` mkdir -p /tmp/test mount $dev /tmp/test resize2fs $dev 248M Delete the problematic plus 1 to fix the issue, and add a WARN_ON_ONCE() to prevent the issue from happening again. [ Note: another reproucer which this commit fixes is: img=test.img rm -f $img truncate -s 25MiB $img mkfs.ext4 -b 4096 -E nodiscard,lazy_itable_init=0,lazy_journal_init=0 $img truncate -s 3GiB $img dev=`losetup -f --show $img` mkdir -p /tmp/test mount $dev /tmp/test resize2fs $dev 3G umount $dev losetup -d $dev -- TYT ]
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ext4子系统中alloc_flex_gd函数中的off-by-one问题。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 665d3e0af4d35acf9a5f58dfd471bc27dbf55880 ~ 0d80d2b8bf613398baf7185009e35f9d0459ecb0 -
LinuxLinux 6.8 -

II. Public POCs for CVE-2024-49880

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III. Intelligence Information for CVE-2024-49880

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Same Patch Batch · Linux · 2024-10-21 · 372 CVEs total

CVE-2024-500439.8 CRITICALnfsd: fix possible badness in FREE_STATEID
CVE-2022-489859.8 CRITICALnet: mana: Fix race on per-CQ variable napi work_done
CVE-2024-476959.8 CRITICALRDMA/rtrs-clt: Reset cid to con_num - 1 to stay in bounds
CVE-2024-500339.8 CRITICALslip: make slhc_remember() more robust against malicious packets
CVE-2024-498559.8 CRITICALnbd: fix race between timeout and normal completion
CVE-2024-500479.8 CRITICALsmb: client: fix UAF in async decryption
CVE-2024-500469.8 CRITICALNFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies()
CVE-2022-490039.8 CRITICALnvme: fix SRCU protection of nvme_ns_head list
CVE-2024-499969.4 CRITICALcifs: Fix buffer overflow when parsing NFS reparse points
CVE-2024-476789.4 CRITICALicmp: change the order of rate limits
CVE-2022-490178.8 HIGHtipc: re-fetch skb cb after tipc_msg_validate
CVE-2024-500298.8 HIGHBluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync
CVE-2024-500418.8 HIGHi40e: Fix macvlan leak by synchronizing access to mac_filter_hash
CVE-2024-499398.8 HIGHwifi: rtw89: avoid to add interface to list twice when SER
CVE-2022-489608.8 HIGHnet: hisilicon: Fix potential use-after-free in hix5hd2_rx()
CVE-2022-489628.8 HIGHnet: hisilicon: Fix potential use-after-free in hisi_femac_rx()
CVE-2022-489648.8 HIGHravb: Fix potential use-after-free in ravb_rx_gbeth()
CVE-2022-490158.8 HIGHnet: hsr: Fix potential use-after-free
CVE-2022-489678.8 HIGHNFC: nci: Bounds check struct nfc_target arrays
CVE-2024-499308.8 HIGHwifi: ath11k: fix array out-of-bound access in SoC stats

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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Same vendor: Linux

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