| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: always restore the old font data in fbcon_do_set_font()\n\nCommit a5a923038d70 (fbdev: fbcon: Properly revert changes when\nvc_resize() failed) started restoring old font data upon failure (of\nvc_resize()). But it performs so only for user fonts. It means that the\n\"system\"/internal fonts are not restored at all. So in result, the very\nfirst call to fbcon_do_set_font() performs no restore at all upon\nfailing vc_resize().\n\nThis can be reproduced by Syzkaller to crash the system on the next\ninvocation of font_get(). It's rather hard to hit the allocation failure\nin vc_resize() on the first font_set(), but not impossible. Esp. if\nfault injection is used to aid the execution/failure. It was\ndemonstrated by Sirius:\n BUG: unable to handle page fault for address: fffffffffffffff8\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD cb7b067 P4D cb7b067 PUD cb7d067 PMD 0\n Oops: 0000 [#1] PREEMPT SMP KASAN\n CPU: 1 PID: 8007 Comm: poc Not tainted 6.7.0-g9d1694dc91ce #20\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n RIP: 0010:fbcon_get_font+0x229/0x800 drivers/video/fbdev/core/fbcon.c:2286\n Call Trace:\n <TASK>\n con_font_get drivers/tty/vt/vt.c:4558 [inline]\n con_font_op+0x1fc/0xf20 drivers/tty/vt/vt.c:4673\n vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline]\n vt_ioctl+0x632/0x2ec0 drivers/tty/vt/vt_ioctl.c:752\n tty_ioctl+0x6f8/0x1570 drivers/tty/tty_io.c:2803\n vfs_ioctl fs/ioctl.c:51 [inline]\n ...\n\nSo restore the font data in any case, not only for user fonts. Note the\nlater 'if' is now protected by 'old_userfont' and not 'old_data' as the\nlatter is always set now. (And it is supposed to be non-NULL. Otherwise\nwe would see the bug above again.)" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "drivers/video/fbdev/core/fbcon.c" |
| ], |
| "versions": [ |
| { |
| "version": "ebd6f886aa2447fcfcdce5450c9e1028e1d681bb", |
| "lessThan": "20a4b5214f7bee13c897477168c77bbf79683c3d", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24", |
| "lessThan": "2f91a96b892fab2f2543b4a55740c5bee36b1a6b", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24", |
| "lessThan": "73a6bd68a1342f3a44cac9dffad81ad6a003e520", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24", |
| "lessThan": "a2c881413dcc5d801bdc9535e51270cc88cb9cd8", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "a5a923038d70d2d4a86cb4e3f32625a5ee6e7e24", |
| "lessThan": "00d6a284fcf3fad1b7e1b5bc3cd87cbfb60ce03f", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "f08ccb792d3eaf1dc62d8cbf6a30d6522329f660", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "drivers/video/fbdev/core/fbcon.c" |
| ], |
| "versions": [ |
| { |
| "version": "6.0", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "6.0", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.151", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.81", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.21", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.7.9", |
| "lessThanOrEqual": "6.7.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.8", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.15.64", |
| "versionEndExcluding": "5.15.151" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.0", |
| "versionEndExcluding": "6.1.81" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.0", |
| "versionEndExcluding": "6.6.21" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.0", |
| "versionEndExcluding": "6.7.9" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.0", |
| "versionEndExcluding": "6.8" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.19.6" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/20a4b5214f7bee13c897477168c77bbf79683c3d" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/2f91a96b892fab2f2543b4a55740c5bee36b1a6b" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/73a6bd68a1342f3a44cac9dffad81ad6a003e520" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/a2c881413dcc5d801bdc9535e51270cc88cb9cd8" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/00d6a284fcf3fad1b7e1b5bc3cd87cbfb60ce03f" |
| } |
| ], |
| "title": "fbcon: always restore the old font data in fbcon_do_set_font()", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-26798", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
