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CVE-2025-39847— ppp: fix memory leak in pad_compress_skb

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pad_compress_skb函数中内存分配失败时未释放旧skb，可能导致内存泄漏。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.16% · P5

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c< 9ca6a040f76c0b149293e430dabab446f3fc8ab7 affected
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c< 87a35a36742df328d0badf4fbc2e56061c15846c affected
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c< 0b21e9cd4559102da798bdcba453b64ecd7be7ee affected
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c< 1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8 affected
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c< 85c1c86a67e09143aa464e9bf09c397816772348 affected
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c< 631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4 affected
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c< 33a5bac5f14772730d2caf632ae97b6c2ee95044 affected
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c< 4844123fe0b853a4982c02666cb3fd863d701d50 affected
… +10 more rows
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I. Basic Information for CVE-2025-39847

Vulnerability Information
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Vulnerability Title
ppp: fix memory leak in pad_compress_skb
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ppp: fix memory leak in pad_compress_skb If alloc_skb() fails in pad_compress_skb(), it returns NULL without releasing the old skb. The caller does: skb = pad_compress_skb(ppp, skb); if (!skb) goto drop; drop: kfree_skb(skb); When pad_compress_skb() returns NULL, the reference to the old skb is lost and kfree_skb(skb) ends up doing nothing, leading to a memory leak. Align pad_compress_skb() semantics with realloc(): only free the old skb if allocation and compression succeed. At the call site, use the new_skb variable so the original skb is not lost when pad_compress_skb() fails.
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pad_compress_skb函数中内存分配失败时未释放旧skb，可能导致内存泄漏。
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 b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c ~ 9ca6a040f76c0b149293e430dabab446f3fc8ab7 -
Linux Linux 2.6.15 -

II. Public POCs for CVE-2025-39847

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III. Intelligence Information for CVE-2025-39847

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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total

CVE-2025-39841 9.8 CRITICAL scsi: lpfc: Fix buffer free/clear order in deferred receive path
CVE-2025-39864 8.8 HIGH wifi: cfg80211: fix use-after-free in cmp_bss()
CVE-2025-39862 8.8 HIGH wifi: mt76: mt7915: fix list corruption after hardware restart
CVE-2025-39839 8.8 HIGH batman-adv: fix OOB read/write in network-coding decode
CVE-2025-39848 8.8 HIGH ax25: properly unshare skbs in ax25_kiss_rcv()
CVE-2025-39849 8.8 HIGH wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()
CVE-2025-39860 8.0 HIGH Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen()
CVE-2025-39837 7.8 HIGH platform/x86: asus-wmi: Fix racy registrations
CVE-2025-39863 7.8 HIGH wifi: brcmfmac: fix use-after-free when rescheduling brcmf_btcoex_info work
CVE-2025-39866 7.8 HIGH fs: writeback: fix use-after-free in __mark_inode_dirty()
CVE-2025-39854 7.8 HIGH ice: fix NULL access of tx->in_use in ice_ll_ts_intr
CVE-2025-39851 7.5 HIGH vxlan: Fix NPD when refreshing an FDB entry with a nexthop object
CVE-2025-39857 7.5 HIGH net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()
CVE-2025-39840 7.1 HIGH audit: fix out-of-bounds read in audit_compare_dname_path()
CVE-2025-39845 x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()
CVE-2025-39865 tee: fix NULL pointer dereference in tee_shm_put
CVE-2025-39838 cifs: prevent NULL pointer dereference in UTF16 conversion
CVE-2025-39861 Bluetooth: vhci: Prevent use-after-free by removing debugfs files early
CVE-2025-39859 ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog
CVE-2025-39842 ocfs2: prevent release journal inode after journal shutdown

Showing top 20 of 30 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39847

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