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CVE-2026-89879— media: s2255: bound JPEG frame size before copying into the buffer

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.

在 Linux 内核中，已解决以下漏洞： media: s2255: 在向缓冲区拷贝前限制 JPEG 帧大小 s2255_fillbuff() 函数会将捕获到的 JPEG/MJPEG 帧的 vc->jpg_size 字节通过 memcpy() 拷贝到 vb2 平面中。vc->jpg_size 直接取自设备发送的 S2255_MARKER_FRAME 头部（save_frame() 中的 pdword[4]），与上方已做范围检查的帧负载长度不同，它从未进行边界限制： 因此，一个恶意或故障的设备可以报告一个比目标 vb

AI Predicted 7.1 Difficulty: Hard EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7< 32a595dd3e8634544e5cfbc47f906dff3d3c1ef8 affected
38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7< 4b6f7bccc6559ae5c54573c284fe76eafc9989b2 affected
38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7< 2542516a147bfad740e7e411c251b639fad260ff affected
38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7< 79f58f900dd221ab04ea74bf4eaf79fa3b0fcc77 affected
38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7< d2ecaaab6a4f165abb54cdf61be60030b5782bf8 affected
38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7< 68d664f1b4efe525e99154b7058fcb0378bdaff7 affected
38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7< dd739517560c8d0ec4463a53e717bf40b988d7da affected
38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7< e504cc888f42999dd76b6a43788c422610f2aad2 affected
… +10 more rows
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I. Basic Information for CVE-2026-89879

Vulnerability Information
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Vulnerability Title
media: s2255: bound JPEG frame size before copying into the buffer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: s2255: bound JPEG frame size before copying into the buffer s2255_fillbuff() memcpy()s vc->jpg_size bytes of a captured JPEG/MJPEG frame into the vb2 plane. vc->jpg_size is taken verbatim from the S2255_MARKER_FRAME header the device sends (pdword[4] in save_frame()) and, unlike the frame payload length just above it, is never bounded: payload = le32_to_cpu(pdword[3]); if (payload > vc->req_image_size) /* payload is checked ... */ return -EINVAL; vc->pkt_size = payload; vc->jpg_size = le32_to_cpu(pdword[4]); /* ... jpg_size is not */ A malicious or malfunctioning device can therefore report a jpg_size larger than the destination vb2 plane, and the memcpy() writes past it. jpg_size is a signed int, so a value with the top bit set also turns into a huge length. Reject a frame whose jpg_size is negative or exceeds the plane size before copying it.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7 ~ 32a595dd3e8634544e5cfbc47f906dff3d3c1ef8 -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2026-89879

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III. Intelligence Information for CVE-2026-89879

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Other References for CVE-2026-89879 (8)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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