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CVE-2026-53048— gfs2: prevent NULL pointer dereference during unmount

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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于gfs2在卸载期间处理glock工作时，可能对已释放的sdp->sd_jdesc指针进行解引用，导致空指针取消引用。

AI Predicted 4.4 Difficulty: Theoretical EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 21

VendorProduct Version RangeStatus
Linux Linux c3c5cfa3170c0940bc66a142859caac07d19b9d6< cec55674354794eddb80b914f73a6bf9b7fc304a affected
5f6a84cfb33b34610623857bd93919dcb661e29b< 2fc4c868c9060f424fd4a7cacb0aec5082aba4de affected
3429ef5f50909cee9e498c50f0c499b9397116ce< 233a0945a4b1dbe3f38c30afb7d05b76c67f1193 affected
35264909e9d1973ab9aaa2a1b07cda70f12bb828< e15f16761594e80b15776980b27c35477655a135 affected
35264909e9d1973ab9aaa2a1b07cda70f12bb828< d8ffae016c4a78693fe1283335d0b6833a9c1366 affected
35264909e9d1973ab9aaa2a1b07cda70f12bb828< abd73229f0e886a91a16ea781ab656bd9b4d1ee8 affected
35264909e9d1973ab9aaa2a1b07cda70f12bb828< 74b4dbb946060a3233604d91859a9abd3708141d affected
f54f9d5368a4e92ede7dd078a62788dae3a7c6ef affected
… +13 more rows
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I. Basic Information for CVE-2026-53048

Vulnerability Information
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Vulnerability Title
gfs2: prevent NULL pointer dereference during unmount
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: gfs2: prevent NULL pointer dereference during unmount When flushing out outstanding glock work during an unmount, gfs2_log_flush() can be called when sdp->sd_jdesc has already been deallocated and sdp->sd_jdesc is NULL. Commit 35264909e9d1 ("gfs2: Fix NULL pointer dereference in gfs2_log_flush") added a check for that to gfs2_log_flush() itself, but it missed the sdp->sd_jdesc dereference in gfs2_log_release(). Fix that.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于gfs2在卸载期间处理glock工作时，可能对已释放的sdp->sd_jdesc指针进行解引用，导致空指针取消引用。
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 c3c5cfa3170c0940bc66a142859caac07d19b9d6 ~ cec55674354794eddb80b914f73a6bf9b7fc304a -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-53048

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III. Intelligence Information for CVE-2026-53048

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Patches & Fixes for CVE-2026-53048 (7)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53048

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